diff --git a/docs/v2/browser-compiler/coffeescript.js b/docs/v2/browser-compiler/coffeescript.js
index f3f9c30fde..3566c6a362 100644
--- a/docs/v2/browser-compiler/coffeescript.js
+++ b/docs/v2/browser-compiler/coffeescript.js
@@ -5,4 +5,4 @@
  * Copyright 2011, Jeremy Ashkenas
  * Released under the MIT License
  */
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Ae.charCodeAt(0)===c&&(Ae=Ae.slice(1)),Ae=Ae.replace(/\r/g,"").replace(pe,""),ye.test(Ae)&&(Ae="\n"+Ae,this.chunkLine--),this.literate&&(Ae=be(Ae)),Ae}},{key:"identifierToken",value:function identifierToken(){var Ae,Oe,Pe,we,je,Me,Ue,Ve,Be,He,Ge,Ye,Xe,We,qe,ze,Je,Ke,Ze,Qe;if(!(Ue=S.exec(this.chunk)))return 0;var ea=Ue,aa=_slicedToArray(ea,3);if(Me=aa[0],we=aa[1],Oe=aa[2],je=we.length,Ve=void 0,"own"===we&&"FOR"===this.tag())return this.token("OWN",we),we.length;if("from"===we&&"YIELD"===this.tag())return this.token("FROM",we),we.length;if("as"===we&&this.seenImport&&("*"===this.value()?this.tokens[this.tokens.length-1][0]="IMPORT_ALL":(Ge=this.value(),0<=xe.call(b,Ge))&&(this.tokens[this.tokens.length-1][0]="IDENTIFIER"),"DEFAULT"===(Ye=this.tag())||"IMPORT_ALL"===Ye||"IDENTIFIER"===Ye))return this.token("AS",we),we.length;if("as"===we&&this.seenExport&&("IDENTIFIER"===(Xe=this.tag())||"DEFAULT"===Xe))return 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we,je,Me,Ue;for(we=this.indent-Ae;0<Ae;)Me=this.indents[this.indents.length-1],Me?this.outdebt&&Ae<=this.outdebt?(this.outdebt-=Ae,Ae=0):(je=this.indents.pop()+this.outdebt,Pe&&(Ue=this.chunk[Pe],0<=xe.call(R,Ue))&&(we-=je-Ae,Ae=je),this.outdebt=0,this.pair("OUTDENT"),this.token("OUTDENT",Ae,0,Pe),Ae-=je):Ae=0;for(je&&(this.outdebt-=Ae);";"===this.value();)this.tokens.pop();return"TERMINATOR"===this.tag()||Oe||this.token("TERMINATOR","\n",Pe,0),this.indent=we,this.indentLiteral=this.indentLiteral.slice(0,we),this}},{key:"whitespaceToken",value:function whitespaceToken(){var Ae,Oe,Pe;return(Ae=ye.exec(this.chunk))||(Oe="\n"===this.chunk.charAt(0))?(Pe=this.prev(),Pe&&(Pe[Ae?"spaced":"newLine"]=!0),Ae?Ae[0].length:0):0}},{key:"newlineToken",value:function newlineToken(Ae){for(;";"===this.value();)this.tokens.pop();return"TERMINATOR"!==this.tag()&&this.token("TERMINATOR","\n",Ae,0),this}},{key:"suppressNewlines",value:function suppressNewlines(){return"\\"===this.value()&&this.tokens.pop(),this}},{key:"literalToken",value:function literalToken(){var Ae,Oe,Pe,we,je,Me,Ue,Ve,Be,He,Ge,Ye;if(Ae=W.exec(this.chunk)){var Xe=Ae,We=_slicedToArray(Xe,1);Ye=We[0],h.test(Ye)&&this.tagParameters()}else Ye=this.chunk.charAt(0);if(He=Ye,we=this.prev(),we&&0<=xe.call(["="].concat(_toConsumableArray(L)),Ye)&&(Be=!1,"="!==Ye||"||"!==(je=we[1])&&"&&"!==je||we.spaced||(we[0]="COMPOUND_ASSIGN",we[1]+="=",we=this.tokens[this.tokens.length-2],Be=!0),we&&"PROPERTY"!==we[0]&&(Pe=null==(Me=we.origin)?we:Me,Oe=Te(we[1],Pe[1]),Oe&&this.error(Oe,Pe[2])),Be))return Ye.length;if("{"===Ye&&this.seenImport?this.importSpecifierList=!0:this.importSpecifierList&&"}"===Ye?this.importSpecifierList=!1:"{"===Ye&&"EXPORT"===(null==we?void 0:we[0])?this.exportSpecifierList=!0:this.exportSpecifierList&&"}"===Ye&&(this.exportSpecifierList=!1),";"===Ye)this.seenFor=this.seenImport=this.seenExport=!1,He="TERMINATOR";else if("*"===Ye&&"EXPORT"===we[0])He="EXPORT_ALL";else if(0<=xe.call(H,Ye))He="MATH";else if(0<=xe.call(_,Ye))He="COMPARE";else if(0<=xe.call(L,Ye))He="COMPOUND_ASSIGN";else if(0<=xe.call(ue,Ye))He="UNARY";else if(0<=xe.call(fe,Ye))He="UNARY_MATH";else if(0<=xe.call(te,Ye))He="SHIFT";else if("?"===Ye&&(null==we?void 0:we.spaced))He="BIN?";else if(we&&!we.spaced)if("("===Ye&&(Ue=we[0],0<=xe.call(f,Ue)))"?"===we[0]&&(we[0]="FUNC_EXIST"),He="CALL_START";else if("["===Ye&&(Ve=we[0],0<=xe.call(A,Ve)))switch(He="INDEX_START",we[0]){case"?":we[0]="INDEX_SOAK";}return Ge=this.makeToken(He,Ye),"("===Ye||"{"===Ye||"["===Ye?this.ends.push({tag:O[Ye],origin:Ge}):")"===Ye||"}"===Ye||"]"===Ye?this.pair(Ye):void 0,(this.tokens.push(Ge),Ye.length)}},{key:"tagParameters",value:function tagParameters(){var Ae,Oe,Pe,we;if(")"!==this.tag())return 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43:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.PassthroughLiteral(Lt[Ct]));break;case 45:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.UndefinedLiteral);break;case 46:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.NullLiteral);break;case 47:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.BooleanLiteral(Lt[Ct]));break;case 48:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.InfinityLiteral(Lt[Ct]));break;case 49:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.NaNLiteral);break;case 50:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Lt[Ct-2],Lt[Ct]));break;case 51:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Assign(Lt[Ct-3],Lt[Ct]));break;case 52:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Lt[Ct-4],Lt[Ct-1]));break;case 53:case 91:case 96:case 97:case 99:case 100:case 101:case 227:case 228:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Value(Lt[Ct]));break;case 54:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),Lt[Ct],"object",{operatorToken:Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1]))}));break;case 55:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-4])(new Tt.Value(Lt[Ct-4])),Lt[Ct-1],"object",{operatorToken:Tt.addLocationDataFn(Nt[Ct-3])(new Tt.Literal(Lt[Ct-3]))}));break;case 56:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),Lt[Ct],null,{operatorToken:Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1]))}));break;case 57:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-4])(new Tt.Value(Lt[Ct-4])),Lt[Ct-1],null,{operatorToken:Tt.addLocationDataFn(Nt[Ct-3])(new Tt.Literal(Lt[Ct-3]))}));break;case 64:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Return(Lt[Ct]));break;case 65:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Return);break;case 66:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.YieldReturn(Lt[Ct]));break;case 67:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.YieldReturn);break;case 68:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.AwaitReturn(Lt[Ct]));break;case 69:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.AwaitReturn);break;case 70:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Comment(Lt[Ct]));break;case 71:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Code(Lt[Ct-3],Lt[Ct],Lt[Ct-1]));break;case 72:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Code([],Lt[Ct],Lt[Ct-1]));break;case 73:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("func");break;case 74:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("boundfunc");break;case 77:case 117:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])([]);break;case 78:case 118:case 137:case 157:case 187:case 229:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])([Lt[Ct]]);break;case 79:case 119:case 138:case 158:case 188:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(Lt[Ct-2].concat(Lt[Ct]));break;case 80:case 120:case 139:case 159:case 189:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(Lt[Ct-3].concat(Lt[Ct]));break;case 81:case 121:case 141:case 161:case 191:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(Lt[Ct-5].concat(Lt[Ct-2]));break;case 82:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Param(Lt[Ct]));break;case 83:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Param(Lt[Ct-1],null,!0));break;case 84:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Param(Lt[Ct-2],Lt[Ct]));break;case 85:case 194:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Expansion);break;case 90:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Splat(Lt[Ct-1]));break;case 92:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].add(Lt[Ct]));break;case 93:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Value(Lt[Ct-1],[].concat(Lt[Ct])));break;case 104:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Super(Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))));break;case 105:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Super(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Index(Lt[Ct-1]))));break;case 106:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Access(Lt[Ct]));break;case 107:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Access(Lt[Ct],"soak"));break;case 108:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Access(new Tt.PropertyName("prototype"))),Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))]);break;case 109:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Access(new Tt.PropertyName("prototype"),"soak")),Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))]);break;case 110:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Access(new Tt.PropertyName("prototype")));break;case 113:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Tt.extend(Lt[Ct],{soak:!0}));break;case 114:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Index(Lt[Ct]));break;case 115:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Slice(Lt[Ct]));break;case 116:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Obj(Lt[Ct-2],Lt[Ct-3].generated));break;case 122:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Class);break;case 123:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Class(null,null,Lt[Ct]));break;case 124:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Class(null,Lt[Ct]));break;case 125:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Class(null,Lt[Ct-1],Lt[Ct]));break;case 126:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Class(Lt[Ct]));break;case 127:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Class(Lt[Ct-1],null,Lt[Ct]));break;case 128:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Class(Lt[Ct-2],Lt[Ct]));break;case 129:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Class(Lt[Ct-3],Lt[Ct-1],Lt[Ct]));break;case 130:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.ImportDeclaration(null,Lt[Ct]));break;case 131:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-2],null),Lt[Ct]));break;case 132:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,Lt[Ct-2]),Lt[Ct]));break;case 133:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,new Tt.ImportSpecifierList([])),Lt[Ct]));break;case 134:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,new Tt.ImportSpecifierList(Lt[Ct-4])),Lt[Ct]));break;case 135:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-4],Lt[Ct-2]),Lt[Ct]));break;case 136:this.$=Tt.addLocationDataFn(Nt[Ct-8],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-7],new Tt.ImportSpecifierList(Lt[Ct-4])),Lt[Ct]));break;case 140:case 160:case 174:case 190:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(Lt[Ct-2]);break;case 142:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportSpecifier(Lt[Ct]));break;case 143:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportSpecifier(Lt[Ct-2],Lt[Ct]));break;case 144:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportSpecifier(new Tt.Literal(Lt[Ct])));break;case 145:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 146:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportDefaultSpecifier(Lt[Ct]));break;case 147:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportNamespaceSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 148:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList([])));break;case 149:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList(Lt[Ct-2])));break;case 150:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.ExportNamedDeclaration(Lt[Ct]));break;case 151:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-2],Lt[Ct],null,{moduleDeclaration:"export"})));break;case 152:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-3],Lt[Ct],null,{moduleDeclaration:"export"})));break;case 153:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-4],Lt[Ct-1],null,{moduleDeclaration:"export"})));break;case 154:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportDefaultDeclaration(Lt[Ct]));break;case 155:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ExportAllDeclaration(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 156:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList(Lt[Ct-4]),Lt[Ct]));break;case 162:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct]));break;case 163:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct-2],Lt[Ct]));break;case 164:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct-2],new Tt.Literal(Lt[Ct])));break;case 165:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ExportSpecifier(new Tt.Literal(Lt[Ct])));break;case 166:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 167:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.TaggedTemplateCall(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 168:case 169:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Call(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 170:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.SuperCall(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Super),Lt[Ct],Lt[Ct-1]));break;case 171:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(!1);break;case 172:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(!0);break;case 173:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([]);break;case 175:case 176:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Value(new Tt.ThisLiteral()));break;case 177:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Value(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.ThisLiteral),[Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))],"this"));break;case 178:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Arr([]));break;case 179:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Arr(Lt[Ct-2]));break;case 180:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("inclusive");break;case 181:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("exclusive");break;case 182:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Range(Lt[Ct-3],Lt[Ct-1],Lt[Ct-2]));break;case 183:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Range(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 184:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Range(Lt[Ct-1],null,Lt[Ct]));break;case 185:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Range(null,Lt[Ct],Lt[Ct-1]));break;case 186:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Range(null,null,Lt[Ct]));break;case 196:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([].concat(Lt[Ct-2],Lt[Ct]));break;case 197:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Try(Lt[Ct]));break;case 198:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Try(Lt[Ct-1],Lt[Ct][0],Lt[Ct][1]));break;case 199:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Try(Lt[Ct-2],null,null,Lt[Ct]));break;case 200:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Try(Lt[Ct-3],Lt[Ct-2][0],Lt[Ct-2][1],Lt[Ct]));break;case 201:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Lt[Ct-1],Lt[Ct]]);break;case 202:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Value(Lt[Ct-1])),Lt[Ct]]);break;case 203:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([null,Lt[Ct]]);break;case 204:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Throw(Lt[Ct]));break;case 205:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Parens(Lt[Ct-1]));break;case 206:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Parens(Lt[Ct-2]));break;case 207:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Lt[Ct]));break;case 208:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.While(Lt[Ct-2],{guard:Lt[Ct]}));break;case 209:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Lt[Ct],{invert:!0}));break;case 210:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.While(Lt[Ct-2],{invert:!0,guard:Lt[Ct]}));break;case 211:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].addBody(Lt[Ct]));break;case 212:case 213:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct].addBody(Tt.addLocationDataFn(Nt[Ct-1])(Tt.Block.wrap([Lt[Ct-1]]))));break;case 214:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(Lt[Ct]);break;case 215:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.BooleanLiteral("true"))).addBody(Lt[Ct]));break;case 216:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.BooleanLiteral("true"))).addBody(Tt.addLocationDataFn(Nt[Ct])(Tt.Block.wrap([Lt[Ct]]))));break;case 217:case 218:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.For(Lt[Ct-1],Lt[Ct]));break;case 219:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.For(Lt[Ct],Lt[Ct-1]));break;case 220:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Tt.addLocationDataFn(Nt[Ct])(new Tt.Value(Lt[Ct]))});break;case 221:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),step:Lt[Ct]});break;case 222:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(function(){return Lt[Ct].own=Lt[Ct-1].own,Lt[Ct].ownTag=Lt[Ct-1].ownTag,Lt[Ct].name=Lt[Ct-1][0],Lt[Ct].index=Lt[Ct-1][1],Lt[Ct]}());break;case 223:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct]);break;case 224:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(function(){return Lt[Ct].own=!0,Lt[Ct].ownTag=Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1])),Lt[Ct]}());break;case 230:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Lt[Ct-2],Lt[Ct]]);break;case 231:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct]});break;case 232:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct],object:!0});break;case 233:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct]});break;case 234:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct],object:!0});break;case 235:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],step:Lt[Ct]});break;case 236:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])({source:Lt[Ct-4],guard:Lt[Ct-2],step:Lt[Ct]});break;case 237:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])({source:Lt[Ct-4],step:Lt[Ct-2],guard:Lt[Ct]});break;case 238:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct],from:!0});break;case 239:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct],from:!0});break;case 240:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Switch(Lt[Ct-3],Lt[Ct-1]));break;case 241:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.Switch(Lt[Ct-5],Lt[Ct-3],Lt[Ct-1]));break;case 242:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Switch(null,Lt[Ct-1]));break;case 243:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.Switch(null,Lt[Ct-3],Lt[Ct-1]));break;case 245:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].concat(Lt[Ct]));break;case 246:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([[Lt[Ct-1],Lt[Ct]]]);break;case 247:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])([[Lt[Ct-2],Lt[Ct-1]]]);break;case 248:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct-1],Lt[Ct],{type:Lt[Ct-2]}));break;case 249:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(Lt[Ct-4].addElse(Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct-1],Lt[Ct],{type:Lt[Ct-2]}))));break;case 251:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(Lt[Ct-2].addElse(Lt[Ct]));break;case 252:case 253:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct],Tt.addLocationDataFn(Nt[Ct-2])(Tt.Block.wrap([Lt[Ct-2]])),{type:Lt[Ct-1],statement:!0}));break;case 256:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("-",Lt[Ct]));break;case 257:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("+",Lt[Ct]));break;case 259:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("--",Lt[Ct]));break;case 260:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("++",Lt[Ct]));break;case 261:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("--",Lt[Ct-1],null,!0));break;case 262:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("++",Lt[Ct-1],null,!0));break;case 263:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Existence(Lt[Ct-1]));break;case 264:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op("+",Lt[Ct-2],Lt[Ct]));break;case 265:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op("-",Lt[Ct-2],Lt[Ct]));break;case 266:case 267:case 268:case 269:case 270:case 271:case 272:case 273:case 274:case 275:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op(Lt[Ct-1],Lt[Ct-2],Lt[Ct]));break;case 276:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(function(){return"!"===Lt[Ct-1].charAt(0)?new Tt.Op(Lt[Ct-1].slice(1),Lt[Ct-2],Lt[Ct]).invert():new Tt.Op(Lt[Ct-1],Lt[Ct-2],Lt[Ct])}());break;case 277:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 278:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Lt[Ct-4],Lt[Ct-1],Lt[Ct-3]));break;case 279:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new 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0:Sa.length)&&(Ra=this.variable.properties,Da=3<=Ra.length?fa.call(Ra,0,Ca=Ra.length-2):(Ca=0,[]),Ea=Ra[Ca++],Fa=Ra[Ca++],"prototype"===(null==(Aa=Ea.name)?void 0:Aa.value)&&(this.value.name=Fa))),Oa=this.value.compileToFragments($a,ee),La=this.variable.compileToFragments($a,ee),"object"===this.context)?(this.variable.shouldCache()&&(La.unshift(this.makeCode("[")),La.push(this.makeCode("]"))),La.concat(this.makeCode(": "),Oa)):(_a=La.concat(this.makeCode(" "+(this.context||"=")+" "),Oa),$a.level>ee||Na&&this.variable.base instanceof fe&&!this.param?this.wrapInParentheses(_a):_a)}},{key:"compileDestructuring",value:function compileDestructuring($a){var Ta,_a,La,Na,Ca,Fa,Da,Ea,xa,Ia,Sa,Ra,Aa,Oa,Pa,wa,ja,Ma,Ua,Va,Ba,Ha,Ga,Ya;if(Va=$a.level===ne,Ha=this.value,wa=this.variable.base.objects,ja=wa.length,0===ja)return La=Ha.compileToFragments($a),$a.level>=ae?this.wrapInParentheses(La):La;var Xa=wa,Wa=_slicedToArray(Xa,1);if(Pa=Wa[0],1===ja&&Pa instanceof E&&Pa.error("Destructuring assignment has no target"),xa=this.variable.isObject(),Va&&1===ja&&!(Pa instanceof De)){if(Na=void 0,Pa instanceof ba&&"object"===Pa.context){var qa=Pa;Ea=qa.variable.base,Pa=qa.value,Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable)}else Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable),Ea=xa?Pa.this?Pa.properties[0].name:new ve(Pa.unwrap().value):new ue(0);return Ta=Ea.unwrap()instanceof ve,Ha=new He(Ha),Ha.properties.push(new(Ta?c:z)(Ea)),Aa=ta(Pa.unwrap().value),Aa&&Pa.error(Aa),Na&&(Na.isDefaultValue=!0,Ha=new he("?",Ha,Na)),new ba(Pa,Ha,null,{param:this.param}).compileToFragments($a,ne)}for(Ga=Ha.compileToFragments($a,ee),Ya=Qe(Ga),_a=[],Ca=!1,(!(Ha.unwrap()instanceof U)||this.variable.assigns(Ya))&&(Ma=$a.scope.freeVariable("ref"),_a.push([this.makeCode(Ma+" = ")].concat(_toConsumableArray(Ga))),Ga=[this.makeCode(Ma)],Ya=Ma),(Da=Sa=0,Ra=wa.length);Sa<Ra;Da=++Sa){if(Pa=wa[Da],Ea=Da,!Ca&&Pa instanceof De)Oa=Pa.name.unwrap().value,Pa=Pa.unwrap(),Ba=ja+" <= "+Ya+".length ? "+pa("slice",$a)+".call("+Ya+", "+Da,Ua=ja-Da-1,0===Ua?Ba+=") : []":(Ia=$a.scope.freeVariable("i",{single:!0}),Ba+=", "+Ia+" = "+Ya+".length - "+Ua+") : ("+Ia+" = "+Da+", [])"),Ba=new oe(Ba),Ca=Ia+"++";else if(!Ca&&Pa instanceof E){Ua=ja-Da-1,0!==Ua&&(1===Ua?Ca=Ya+".length - 1":(Ia=$a.scope.freeVariable("i",{single:!0}),Ba=new oe(Ia+" = "+Ya+".length - "+Ua),Ca=Ia+"++",_a.push(Ba.compileToFragments($a,ee))));continue}else{if((Pa instanceof De||Pa instanceof E)&&Pa.error("multiple splats/expansions are disallowed in an assignment"),Na=void 0,Pa instanceof ba&&"object"===Pa.context){var za=Pa;Ea=za.variable.base,Pa=za.value,Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable)}else Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable),Ea=xa?Pa.this?Pa.properties[0].name:new ve(Pa.unwrap().value):new oe(Ca||Ea);Oa=Pa.unwrap().value,Ta=Ea.unwrap()instanceof ve,Ba=new He(new oe(Ya),[new(Ta?c:z)(Ea)]),Na&&(Na.isDefaultValue=!0,Ba=new he("?",Ba,Na))}null!=Oa&&(Aa=ta(Oa),Aa&&Pa.error(Aa)),_a.push(new ba(Pa,Ba,null,{param:this.param,subpattern:!0}).compileToFragments($a,ee))}return Va||this.subpattern||_a.push(Ga),Fa=this.joinFragmentArrays(_a,", "),$a.level<ee?Fa:this.wrapInParentheses(Fa)}},{key:"compileConditional",value:function compileConditional($a){var Na=this.variable.cacheReference($a),Ca=_slicedToArray(Na,2),Ta,_a,La;return _a=Ca[0],La=Ca[1],_a.properties.length||!(_a.base instanceof oe)||_a.base instanceof je||$a.scope.check(_a.base.value)||this.variable.error("the variable \""+_a.base.value+"\" can't be assigned with "+this.context+" because it has not been declared before"),0<=ma.call(this.context,"?")?($a.isExistentialEquals=!0,new V(new D(_a),La,{type:"if"}).addElse(new ba(La,this.value,"=")).compileToFragments($a)):(Ta=new he(this.context.slice(0,-1),_a,new ba(La,this.value,"=")).compileToFragments($a),$a.level<=ee?Ta:this.wrapInParentheses(Ta))}},{key:"compileSpecialMath",value:function compileSpecialMath($a){var La=this.variable.cacheReference($a),Na=_slicedToArray(La,2),Ta,_a;return Ta=Na[0],_a=Na[1],new ba(Ta,new he(this.context.slice(0,-1),_a,this.value)).compileToFragments($a)}},{key:"compileSplice",value:function compileSplice($a){var Ia=this.variable.properties.pop(),Sa=Ia.range,Ta,_a,La,Na,Ca,Fa,Da,Ea,xa;if(La=Sa.from,Da=Sa.to,_a=Sa.exclusive,Fa=this.variable.compile($a),La){var Ra=this.cacheToCodeFragments(La.cache($a,ae)),Aa=_slicedToArray(Ra,2);Na=Aa[0],Ca=Aa[1]}else Na=Ca="0";Da?(null==La?void 0:La.isNumber())&&Da.isNumber()?(Da=Da.compile($a)-Ca,!_a&&(Da+=1)):(Da=Da.compile($a,Z)+" - "+Ca,!_a&&(Da+=" + 1")):Da="9e9";var Oa=this.value.cache($a,ee),Pa=_slicedToArray(Oa,2);return Ea=Pa[0],xa=Pa[1],Ta=[].concat(this.makeCode(pa("splice",$a)+".apply("+Fa+", ["+Na+", "+Da+"].concat("),Ea,this.makeCode(")), "),xa),$a.level>ne?this.wrapInParentheses(Ta):Ta}},{key:"eachName",value:function eachName($a){return this.variable.unwrapAll().eachName($a)}}]),ba}(g);return ka.prototype.children=["variable","value"],ka.prototype.isAssignable=Ye,ka}(),t.Code=L=function(){var ka=function(va){function ba($a,Ta,_a){_classCallCheck(this,ba);var La=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return La.params=$a||[],La.body=Ta||new y,La.bound="boundfunc"===_a,La.isGenerator=!1,La.isAsync=!1,La.isMethod=!1,La.body.traverseChildren(!1,function(Na){if((Na instanceof he&&Na.isYield()||Na instanceof Xe)&&(La.isGenerator=!0),(Na instanceof he&&Na.isAwait()||Na instanceof h)&&(La.isAsync=!0),La.isGenerator&&La.isAsync)return Na.error("function can't contain both yield and await")}),La}return _inherits(ba,va),_createClass(ba,[{key:"isStatement",value:function isStatement(){return this.isMethod}},{key:"makeScope",value:function makeScope($a){return new Ce($a,this.body,this)}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca,Fa,Da,Ea,xa,Ia,Sa,Ra,Aa,Oa,Pa,wa,ja,Ma,Ua,Va,Ba,Ha,Ga,Ya,Xa,Wa,qa,za,Ja,Ka,Za,Qa;for(this.ctor&&(this.isAsync&&this.name.error("Class constructor may not be async"),this.isGenerator&&this.name.error("Class constructor may not be a generator")),this.bound&&((null==(Ya=$a.scope.method)?void 0:Ya.bound)&&(this.context=$a.scope.method.context),!this.context&&(this.context="this")),$a.scope=ze($a,"classScope")||this.makeScope($a.scope),$a.scope.shared=ze($a,"sharedScope"),$a.indent+=Oe,delete $a.bare,delete $a.isExistentialEquals,Ba=[],Fa=[],Za=null==(Xa=null==(Wa=this.thisAssignments)?void 0:Wa.slice())?[]:Xa,Ha=[],Ea=!1,Da=!1,Va=[],this.eachParamName(function(rt,it,st){var dt;if(0<=ma.call(Va,rt)&&it.error("multiple parameters named '"+rt+"'"),Va.push(rt),it.this)return rt=it.properties[0].name.value,0<=ma.call(K,rt)&&(rt="_"+rt),dt=new U($a.scope.freeVariable(rt)),st.renameParam(it,dt),Za.push(new f(it,dt))}),qa=this.params,(xa=Sa=0,Aa=qa.length);Sa<Aa;xa=++Sa)Ua=qa[xa],Ua.splat||Ua instanceof E?(Ea?Ua.error("only one splat or expansion parameter is allowed per function definition"):Ua instanceof E&&1===this.params.length&&Ua.error("an expansion parameter cannot be the only parameter in a function definition"),Ea=!0,Ua.splat?(Ua.name instanceof u?(Ka=$a.scope.freeVariable("arg"),Ba.push(Ga=new He(new U(Ka))),Fa.push(new f(new He(Ua.name),Ga,null,{param:!0}))):(Ba.push(Ga=Ua.asReference($a)),Ka=Qe(Ga.compileNode($a))),Ua.shouldCache()&&Fa.push(new f(new He(Ua.name),Ga,null,{param:!0}))):(Ka=$a.scope.freeVariable("args"),Ba.push(new He(new U(Ka)))),$a.scope.parameter(Ka)):((Ua.shouldCache()||Da)&&(Ua.assignedInBody=!0,Da=!0,null==Ua.value?Fa.push(new f(new He(Ua.name),Ua.asReference($a),null,{param:!0})):(Ca=new he("===",Ua,new Be()),Ia=new f(new He(Ua.name),Ua.value,null,{param:!0}),Fa.push(new V(Ca,Ia)))),Ea?(Ha.push(Ua),null!=Ua.value&&!Ua.shouldCache()&&(Ca=new he("===",Ua,new Be()),Ia=new f(new He(Ua.name),Ua.value),Fa.push(new V(Ca,Ia))),null!=(null==(za=Ua.name)?void 0:za.value)&&$a.scope.add(Ua.name.value,"var",!0)):(Ga=Ua.shouldCache()?Ua.asReference($a):null==Ua.value||Ua.assignedInBody?Ua:new f(new He(Ua.name),Ua.value,null,{param:!0}),Ua.name instanceof u||Ua.name instanceof fe?(Ua.name.lhs=!0,Ua.name.eachName(function(rt){return $a.scope.parameter(rt.value)})):$a.scope.parameter(Qe((null==Ua.value?Ga:Ua).compileToFragments($a))),Ba.push(Ga)));if(0!==Ha.length&&Fa.unshift(new f(new He(new u([new De(new U(Ka))].concat(_toConsumableArray(function(){var rt,it,st;for(st=[],rt=0,it=Ha.length;rt<it;rt++)Ua=Ha[rt],st.push(Ua.asReference($a));return st}())))),new He(new U(Ka)))),Qa=this.body.isEmpty(),!this.expandCtorSuper(Za)){var et;(et=this.body.expressions).unshift.apply(et,_toConsumableArray(Za))}for((Ta=this.body.expressions).unshift.apply(Ta,_toConsumableArray(Fa)),Qa||this.noReturn||this.body.makeReturn(),ja=[],this.isMethod&&this.isStatic&&ja.push("static"),this.isAsync&&ja.push("async"),this.isMethod||this.bound?this.isGenerator&&ja.push("*"):ja.push("function"+(this.isGenerator?"*":"")),Ja=[this.makeCode("(")],(xa=Ra=0,Oa=Ba.length);Ra<Oa;xa=++Ra){var at;Ua=Ba[xa],xa&&Ja.push(this.makeCode(", ")),Ea&&xa===Ba.length-1&&Ja.push(this.makeCode("...")),(at=Ja).push.apply(at,_toConsumableArray(Ua.compileToFragments($a)))}if(Ja.push(this.makeCode(")")),this.body.isEmpty()||(Na=this.body.compileWithDeclarations($a)),this.isMethod){var tt=[$a.scope,$a.scope.parent];wa=tt[0],$a.scope=tt[1],Ma=this.name.compileToFragments($a),"."===Ma[0].code&&Ma.shift(),$a.scope=wa}if(La=this.joinFragmentArrays(function(){var rt,it,st;for(st=[],rt=0,it=ja.length;rt<it;rt++)Pa=ja[rt],st.push(this.makeCode(Pa));return st}.call(this)," "),ja.length&&Ma&&La.push(this.makeCode(" ")),Ma){var nt;(nt=La).push.apply(nt,_toConsumableArray(Ma))}if((_a=La).push.apply(_a,_toConsumableArray(Ja)),this.bound&&!this.isMethod&&La.push(this.makeCode(" =>")),La.push(this.makeCode(" {")),null==Na?void 0:Na.length){var ot;(ot=La).push.apply(ot,[this.makeCode("\n")].concat(_toConsumableArray(Na),[this.makeCode("\n"+this.tab)]))}return La.push(this.makeCode("}")),this.isMethod?[this.makeCode(this.tab)].concat(_toConsumableArray(La)):this.front||$a.level>=Z?this.wrapInParentheses(La):La}},{key:"eachParamName",value:function eachParamName($a){var Ta,_a,La,Na,Ca;for(Na=this.params,Ca=[],(Ta=0,_a=Na.length);Ta<_a;Ta++)La=Na[Ta],Ca.push(La.eachName($a));return Ca}},{key:"traverseChildren",value:function traverseChildren($a,Ta){if($a)return _get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"traverseChildren",this).call(this,$a,Ta)}},{key:"replaceInContext",value:function replaceInContext($a,Ta){return!!this.bound&&_get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"replaceInContext",this).call(this,$a,Ta)}},{key:"expandCtorSuper",value:function expandCtorSuper($a){var Ta=this,_a,La,Na,Ca;return!!this.ctor&&(this.eachSuperCall(y.wrap(this.params),function(Fa){return Fa.error("'super' is not allowed in constructor parameter defaults")}),Ca=this.eachSuperCall(this.body,function(Fa){return"base"===Ta.ctor&&Fa.error("'super' is only allowed in derived class constructors"),Fa.expressions=$a}),_a=$a.length&&$a.length!==(null==(Na=this.thisAssignments)?void 0:Na.length),"derived"===this.ctor&&!Ca&&_a&&(La=$a[0].variable,La.error("Can't use @params in derived class constructors without calling super")),Ca)}},{key:"eachSuperCall",value:function eachSuperCall($a,Ta){var _a=this,La;return La=!1,$a.traverseChildren(!0,function(Na){return Na instanceof Re?(La=!0,Ta(Na)):Na instanceof je&&"derived"===_a.ctor&&!La&&Na.error("Can't reference 'this' before 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U($a.scope.freeVariable("arg"))),_a=new He(_a),_a.updateLocationDataIfMissing(this.locationData),this.reference=_a)}},{key:"shouldCache",value:function shouldCache(){return this.name.shouldCache()}},{key:"eachName",value:function eachName($a){var Ta=this,_a=1<arguments.length&&void 0!==arguments[1]?arguments[1]:this.name,La,Na,Ca,Fa,Da,Ea,xa;if(La=function atParam(Ia){return $a("@"+Ia.properties[0].name.value,Ia,Ta)},_a instanceof oe)return $a(_a.value,_a,this);if(_a instanceof He)return La(_a);for(xa=null==(Ea=_a.objects)?[]:Ea,Na=0,Ca=xa.length;Na<Ca;Na++)Da=xa[Na],Da instanceof f&&null==Da.context&&(Da=Da.variable),Da instanceof f?(Da.value instanceof f&&(Da=Da.value),this.eachName($a,Da.value.unwrap())):Da instanceof De?(Fa=Da.name.unwrap(),$a(Fa.value,Fa,this)):Da instanceof He?Da.isArray()||Da.isObject()?this.eachName($a,Da.base):Da.this?La(Da):$a(Da.base.value,Da.base,this):!(Da instanceof E)&&Da.error("illegal parameter "+Da.compile())}},{key:"renameParam",value:function renameParam($a,Ta){var _a,La;return _a=function isNode(Na){return Na===$a},La=function replacement(Na,Ca){var Fa;return Ca instanceof fe?(Fa=Na,Na.this&&(Fa=Na.properties[0].name),new f(new He(Fa),Ta,"object")):Ta},this.replaceInContext(_a,La)}}]),ba}(g);return ka.prototype.children=["name","value"],ka}(),t.Splat=De=function(){var ka=function(va){function ba($a){_classCallCheck(this,ba);var Ta=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return Ta.name=$a.compile?$a:new oe($a),Ta}return _inherits(ba,va),_createClass(ba,[{key:"isAssignable",value:function isAssignable(){return this.name.isAssignable()&&(!this.name.isAtomic||this.name.isAtomic())}}]),_createClass(ba,[{key:"assigns",value:function assigns($a){return this.name.assigns($a)}},{key:"compileToFragments",value:function compileToFragments($a){return[this.makeCode("...")].concat(_toConsumableArray(this.name.compileToFragments($a)))}},{key:"unwrap",value:function unwrap(){return this.name}}]),ba}(g);return ka.prototype.children=["name"],ka}(),t.Expansion=E=function(){var ka=function(va){function ba(){return _classCallCheck(this,ba),_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).apply(this,arguments))}return _inherits(ba,va),_createClass(ba,[{key:"compileNode",value:function compileNode(){return this.error("Expansion must be used inside a destructuring assignment or parameter list")}},{key:"asReference",value:function asReference(){return this}},{key:"eachName",value:function eachName(){}}]),ba}(g);return ka.prototype.shouldCache=de,ka}(),t.While=Ge=function(){var ka=function(va){function ba($a,Ta){_classCallCheck(this,ba);var _a=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return _a.condition=(null==Ta?void 0:Ta.invert)?$a.invert():$a,_a.guard=null==Ta?void 0:Ta.guard,_a}return _inherits(ba,va),_createClass(ba,[{key:"makeReturn",value:function makeReturn($a){return $a?_get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"makeReturn",this).call(this,$a):(this.returns=!this.jumps({loop:!0}),this)}},{key:"addBody",value:function addBody($a){return this.body=$a,this}},{key:"jumps",value:function jumps(){var $a,Ta,_a,La,Na;if($a=this.body.expressions,!$a.length)return!1;for(Ta=0,La=$a.length;Ta<La;Ta++)if(Na=$a[Ta],_a=Na.jumps({loop:!0}))return _a;return!1}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na;return $a.indent+=Oe,Na="",_a=this.body,_a.isEmpty()?_a=this.makeCode(""):(this.returns&&(_a.makeReturn(La=$a.scope.freeVariable("results")),Na=""+this.tab+La+" = [];\n"),this.guard&&(1<_a.expressions.length?_a.expressions.unshift(new V(new ye(this.guard).invert(),new Ee("continue"))):this.guard&&(_a=y.wrap([new V(this.guard,_a)]))),_a=[].concat(this.makeCode("\n"),_a.compileToFragments($a,ne),this.makeCode("\n"+this.tab))),Ta=[].concat(this.makeCode(Na+this.tab+"while 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_a;return this.isUnary()&&("+"===(_a=this.operator)||"-"===_a)&&this.first instanceof He&&this.first.isNumber()}},{key:"isAwait",value:function isAwait(){return"await"===this.operator}},{key:"isYield",value:function isYield(){var _a;return"yield"===(_a=this.operator)||"yield*"===_a}},{key:"isUnary",value:function isUnary(){return!this.second}},{key:"shouldCache",value:function shouldCache(){return!this.isNumber()}},{key:"isChainable",value:function isChainable(){var _a;return"<"===(_a=this.operator)||">"===_a||">="===_a||"<="===_a||"==="===_a||"!=="===_a}},{key:"invert",value:function invert(){var _a,La,Na,Ca,Fa;if(this.isChainable()&&this.first.isChainable()){for(_a=!0,La=this;La&&La.operator;)_a&&(_a=La.operator in va),La=La.first;if(!_a)return new ye(this).invert();for(La=this;La&&La.operator;)La.invert=!La.invert,La.operator=va[La.operator],La=La.first;return this}return(Ca=va[this.operator])?(this.operator=Ca,this.first.unwrap()instanceof 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_inherits(ba,va),_createClass(ba,[{key:"jumps",value:function jumps($a){var Ta;return this.attempt.jumps($a)||(null==(Ta=this.recovery)?void 0:Ta.jumps($a))}},{key:"makeReturn",value:function makeReturn($a){return this.attempt&&(this.attempt=this.attempt.makeReturn($a)),this.recovery&&(this.recovery=this.recovery.makeReturn($a)),this}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca,Fa;return $a.indent+=Oe,Fa=this.attempt.compileToFragments($a,ne),Ta=this.recovery?(La=$a.scope.freeVariable("error",{reserve:!1}),Ca=new U(La),this.errorVariable?(Na=ta(this.errorVariable.unwrapAll().value),Na?this.errorVariable.error(Na):void 0,this.recovery.unshift(new f(this.errorVariable,Ca))):void 0,[].concat(this.makeCode(" catch ("),Ca.compileToFragments($a),this.makeCode(") {\n"),this.recovery.compileToFragments($a,ne),this.makeCode("\n"+this.tab+"}"))):this.ensure||this.recovery?[]:(La=$a.scope.freeVariable("error",{reserve:!1}),[this.makeCode(" catch ("+La+") 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Na=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this)),_a,La;if(Na.source=Ta.source,Na.guard=Ta.guard,Na.step=Ta.step,Na.name=Ta.name,Na.index=Ta.index,Na.body=y.wrap([$a]),Na.own=!!Ta.own,Na.object=!!Ta.object,Na.from=!!Ta.from,Na.from&&Na.index&&Na.index.error("cannot use index with for-from"),Na.own&&!Na.object&&Ta.ownTag.error("cannot use own with for-"+(Na.from?"from":"in")),Na.object){var Ca=[Na.index,Na.name];Na.name=Ca[0],Na.index=Ca[1]}return((null==(_a=Na.index)?void 0:"function"==typeof _a.isArray?_a.isArray():void 0)||(null==(La=Na.index)?void 0:"function"==typeof La.isObject?La.isObject():void 0))&&Na.index.error("index cannot be a pattern matching expression"),Na.range=Na.source instanceof He&&Na.source.base instanceof be&&!Na.source.properties.length&&!Na.from,Na.pattern=Na.name instanceof He,Na.range&&Na.index&&Na.index.error("indexes do not apply to range loops"),Na.range&&Na.pattern&&Na.name.error("cannot pattern match over range 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this.pattern&&(Va=Pa),et="",Sa="",Da="",Ra=this.tab+Oe,this.range?Ia=za.compileToFragments(oa($a,{index:Pa,name:Va,step:this.step,shouldCache:ia})):(Qa=this.source.compile($a,ee),(Va||this.own)&&!(this.source.unwrap()instanceof U)&&(Da+=""+this.tab+(Ha=qa.freeVariable("ref"))+" = "+Qa+";\n",Qa=Ha),Va&&!this.pattern&&!this.from&&(Ba=Va+" = "+Qa+"["+wa+"]"),!this.object&&!this.from&&(Ja!==Za&&(Da+=""+this.tab+Ja+";\n"),xa=0>Ka,!(this.step&&null!=Ka&&xa)&&(Ua=qa.freeVariable("len")),Ca=""+ja+Pa+" = 0, "+Ua+" = "+Qa+".length",Fa=""+ja+Pa+" = "+Qa+".length - 1",La=Pa+" < "+Ua,Na=Pa+" >= 0",this.step?(null==Ka?(La=Za+" > 0 ? 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this;for(Oe=[],we=this.tokens,Ae=we.length,we[--Ae][0]="PARAM_END";Pe=we[--Ae];)switch(Pe[0]){case")":Oe.push(Pe);break;case"(":case"CALL_START":if(Oe.length)Oe.pop();else return"("===Pe[0]?(Pe[0]="PARAM_START",this):this;}return this}},{key:"closeIndentation",value:function closeIndentation(){return this.outdentToken(this.indent)}},{key:"matchWithInterpolations",value:function matchWithInterpolations(Ae,Oe){var Pe,we,je,Me,Ue,Ve,Be,He,Ge,Ye,Xe,We,qe;if(qe=[],He=Oe.length,this.chunk.slice(0,He)!==Oe)return null;for(Xe=this.chunk.slice(He);;){var ze=Ae.exec(Xe),Je=_slicedToArray(ze,1);if(We=Je[0],this.validateEscapes(We,{isRegex:"/"===Oe.charAt(0),offsetInChunk:He}),qe.push(this.makeToken("NEOSTRING",We,He)),Xe=Xe.slice(We.length),He+=We.length,"#{"!==Xe.slice(0,2))break;var Ke=this.getLineAndColumnFromChunk(He+1),Ze=_slicedToArray(Ke,2);Ve=Ze[0],we=Ze[1];var Qe=new 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258:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op(Lt[Ct-1],Lt[Ct]));break;case 31:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op(Lt[Ct-2].concat(Lt[Ct-1]),Lt[Ct]));break;case 32:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Block);break;case 33:case 112:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(Lt[Ct-1]);break;case 34:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.IdentifierLiteral(Lt[Ct]));break;case 35:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.PropertyName(Lt[Ct]));break;case 36:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.NumberLiteral(Lt[Ct]));break;case 38:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.StringLiteral(Lt[Ct]));break;case 39:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.StringWithInterpolations(Lt[Ct-1]));break;case 40:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.RegexLiteral(Lt[Ct]));break;case 41:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.RegexWithInterpolations(Lt[Ct-1].args));break;case 43:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.PassthroughLiteral(Lt[Ct]));break;case 45:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.UndefinedLiteral);break;case 46:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.NullLiteral);break;case 47:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.BooleanLiteral(Lt[Ct]));break;case 48:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.InfinityLiteral(Lt[Ct]));break;case 49:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.NaNLiteral);break;case 50:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Lt[Ct-2],Lt[Ct]));break;case 51:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Assign(Lt[Ct-3],Lt[Ct]));break;case 52:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Lt[Ct-4],Lt[Ct-1]));break;case 53:case 91:case 96:case 97:case 99:case 100:case 101:case 227:case 228:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Value(Lt[Ct]));break;case 54:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),Lt[Ct],"object",{operatorToken:Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1]))}));break;case 55:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-4])(new Tt.Value(Lt[Ct-4])),Lt[Ct-1],"object",{operatorToken:Tt.addLocationDataFn(Nt[Ct-3])(new Tt.Literal(Lt[Ct-3]))}));break;case 56:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),Lt[Ct],null,{operatorToken:Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1]))}));break;case 57:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Tt.addLocationDataFn(Nt[Ct-4])(new Tt.Value(Lt[Ct-4])),Lt[Ct-1],null,{operatorToken:Tt.addLocationDataFn(Nt[Ct-3])(new Tt.Literal(Lt[Ct-3]))}));break;case 64:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Return(Lt[Ct]));break;case 65:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Return);break;case 66:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.YieldReturn(Lt[Ct]));break;case 67:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.YieldReturn);break;case 68:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.AwaitReturn(Lt[Ct]));break;case 69:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.AwaitReturn);break;case 70:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Comment(Lt[Ct]));break;case 71:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Code(Lt[Ct-3],Lt[Ct],Lt[Ct-1]));break;case 72:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Code([],Lt[Ct],Lt[Ct-1]));break;case 73:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("func");break;case 74:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("boundfunc");break;case 77:case 117:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])([]);break;case 78:case 118:case 137:case 157:case 187:case 229:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])([Lt[Ct]]);break;case 79:case 119:case 138:case 158:case 188:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(Lt[Ct-2].concat(Lt[Ct]));break;case 80:case 120:case 139:case 159:case 189:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(Lt[Ct-3].concat(Lt[Ct]));break;case 81:case 121:case 141:case 161:case 191:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(Lt[Ct-5].concat(Lt[Ct-2]));break;case 82:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Param(Lt[Ct]));break;case 83:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Param(Lt[Ct-1],null,!0));break;case 84:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Param(Lt[Ct-2],Lt[Ct]));break;case 85:case 194:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Expansion);break;case 90:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Splat(Lt[Ct-1]));break;case 92:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].add(Lt[Ct]));break;case 93:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Value(Lt[Ct-1],[].concat(Lt[Ct])));break;case 104:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Super(Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))));break;case 105:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Super(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Index(Lt[Ct-1]))));break;case 106:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Access(Lt[Ct]));break;case 107:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Access(Lt[Ct],"soak"));break;case 108:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Access(new Tt.PropertyName("prototype"))),Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))]);break;case 109:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Access(new Tt.PropertyName("prototype"),"soak")),Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))]);break;case 110:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Access(new Tt.PropertyName("prototype")));break;case 113:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Tt.extend(Lt[Ct],{soak:!0}));break;case 114:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Index(Lt[Ct]));break;case 115:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Slice(Lt[Ct]));break;case 116:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Obj(Lt[Ct-2],Lt[Ct-3].generated));break;case 122:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Class);break;case 123:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Class(null,null,Lt[Ct]));break;case 124:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Class(null,Lt[Ct]));break;case 125:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Class(null,Lt[Ct-1],Lt[Ct]));break;case 126:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Class(Lt[Ct]));break;case 127:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Class(Lt[Ct-1],null,Lt[Ct]));break;case 128:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Class(Lt[Ct-2],Lt[Ct]));break;case 129:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Class(Lt[Ct-3],Lt[Ct-1],Lt[Ct]));break;case 130:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.ImportDeclaration(null,Lt[Ct]));break;case 131:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-2],null),Lt[Ct]));break;case 132:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,Lt[Ct-2]),Lt[Ct]));break;case 133:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,new Tt.ImportSpecifierList([])),Lt[Ct]));break;case 134:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(null,new Tt.ImportSpecifierList(Lt[Ct-4])),Lt[Ct]));break;case 135:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-4],Lt[Ct-2]),Lt[Ct]));break;case 136:this.$=Tt.addLocationDataFn(Nt[Ct-8],Nt[Ct])(new Tt.ImportDeclaration(new Tt.ImportClause(Lt[Ct-7],new Tt.ImportSpecifierList(Lt[Ct-4])),Lt[Ct]));break;case 140:case 160:case 174:case 190:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(Lt[Ct-2]);break;case 142:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportSpecifier(Lt[Ct]));break;case 143:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportSpecifier(Lt[Ct-2],Lt[Ct]));break;case 144:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportSpecifier(new Tt.Literal(Lt[Ct])));break;case 145:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 146:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ImportDefaultSpecifier(Lt[Ct]));break;case 147:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ImportNamespaceSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 148:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList([])));break;case 149:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList(Lt[Ct-2])));break;case 150:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.ExportNamedDeclaration(Lt[Ct]));break;case 151:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-2],Lt[Ct],null,{moduleDeclaration:"export"})));break;case 152:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-3],Lt[Ct],null,{moduleDeclaration:"export"})));break;case 153:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.Assign(Lt[Ct-4],Lt[Ct-1],null,{moduleDeclaration:"export"})));break;case 154:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportDefaultDeclaration(Lt[Ct]));break;case 155:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.ExportAllDeclaration(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 156:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.ExportNamedDeclaration(new Tt.ExportSpecifierList(Lt[Ct-4]),Lt[Ct]));break;case 162:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct]));break;case 163:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct-2],Lt[Ct]));break;case 164:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(Lt[Ct-2],new Tt.Literal(Lt[Ct])));break;case 165:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.ExportSpecifier(new Tt.Literal(Lt[Ct])));break;case 166:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.ExportSpecifier(new Tt.Literal(Lt[Ct-2]),Lt[Ct]));break;case 167:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.TaggedTemplateCall(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 168:case 169:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Call(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 170:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.SuperCall(Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Super),Lt[Ct],Lt[Ct-1]));break;case 171:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(!1);break;case 172:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(!0);break;case 173:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([]);break;case 175:case 176:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Value(new Tt.ThisLiteral()));break;case 177:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Value(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.ThisLiteral),[Tt.addLocationDataFn(Nt[Ct])(new Tt.Access(Lt[Ct]))],"this"));break;case 178:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Arr([]));break;case 179:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Arr(Lt[Ct-2]));break;case 180:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("inclusive");break;case 181:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])("exclusive");break;case 182:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Range(Lt[Ct-3],Lt[Ct-1],Lt[Ct-2]));break;case 183:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Range(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 184:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Range(Lt[Ct-1],null,Lt[Ct]));break;case 185:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Range(null,Lt[Ct],Lt[Ct-1]));break;case 186:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(new Tt.Range(null,null,Lt[Ct]));break;case 196:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([].concat(Lt[Ct-2],Lt[Ct]));break;case 197:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Try(Lt[Ct]));break;case 198:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Try(Lt[Ct-1],Lt[Ct][0],Lt[Ct][1]));break;case 199:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Try(Lt[Ct-2],null,null,Lt[Ct]));break;case 200:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Try(Lt[Ct-3],Lt[Ct-2][0],Lt[Ct-2][1],Lt[Ct]));break;case 201:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Lt[Ct-1],Lt[Ct]]);break;case 202:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Value(Lt[Ct-1])),Lt[Ct]]);break;case 203:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])([null,Lt[Ct]]);break;case 204:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Throw(Lt[Ct]));break;case 205:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Parens(Lt[Ct-1]));break;case 206:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Parens(Lt[Ct-2]));break;case 207:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Lt[Ct]));break;case 208:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.While(Lt[Ct-2],{guard:Lt[Ct]}));break;case 209:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Lt[Ct],{invert:!0}));break;case 210:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.While(Lt[Ct-2],{invert:!0,guard:Lt[Ct]}));break;case 211:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].addBody(Lt[Ct]));break;case 212:case 213:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct].addBody(Tt.addLocationDataFn(Nt[Ct-1])(Tt.Block.wrap([Lt[Ct-1]]))));break;case 214:this.$=Tt.addLocationDataFn(Nt[Ct],Nt[Ct])(Lt[Ct]);break;case 215:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.BooleanLiteral("true"))).addBody(Lt[Ct]));break;case 216:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.While(Tt.addLocationDataFn(Nt[Ct-1])(new Tt.BooleanLiteral("true"))).addBody(Tt.addLocationDataFn(Nt[Ct])(Tt.Block.wrap([Lt[Ct]]))));break;case 217:case 218:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.For(Lt[Ct-1],Lt[Ct]));break;case 219:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.For(Lt[Ct],Lt[Ct-1]));break;case 220:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Tt.addLocationDataFn(Nt[Ct])(new Tt.Value(Lt[Ct]))});break;case 221:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Tt.addLocationDataFn(Nt[Ct-2])(new Tt.Value(Lt[Ct-2])),step:Lt[Ct]});break;case 222:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(function(){return Lt[Ct].own=Lt[Ct-1].own,Lt[Ct].ownTag=Lt[Ct-1].ownTag,Lt[Ct].name=Lt[Ct-1][0],Lt[Ct].index=Lt[Ct-1][1],Lt[Ct]}());break;case 223:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct]);break;case 224:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(function(){return Lt[Ct].own=!0,Lt[Ct].ownTag=Tt.addLocationDataFn(Nt[Ct-1])(new Tt.Literal(Lt[Ct-1])),Lt[Ct]}());break;case 230:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([Lt[Ct-2],Lt[Ct]]);break;case 231:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct]});break;case 232:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct],object:!0});break;case 233:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct]});break;case 234:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct],object:!0});break;case 235:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],step:Lt[Ct]});break;case 236:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])({source:Lt[Ct-4],guard:Lt[Ct-2],step:Lt[Ct]});break;case 237:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])({source:Lt[Ct-4],step:Lt[Ct-2],guard:Lt[Ct]});break;case 238:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])({source:Lt[Ct],from:!0});break;case 239:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])({source:Lt[Ct-2],guard:Lt[Ct],from:!0});break;case 240:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Switch(Lt[Ct-3],Lt[Ct-1]));break;case 241:this.$=Tt.addLocationDataFn(Nt[Ct-6],Nt[Ct])(new Tt.Switch(Lt[Ct-5],Lt[Ct-3],Lt[Ct-1]));break;case 242:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Switch(null,Lt[Ct-1]));break;case 243:this.$=Tt.addLocationDataFn(Nt[Ct-5],Nt[Ct])(new Tt.Switch(null,Lt[Ct-3],Lt[Ct-1]));break;case 245:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(Lt[Ct-1].concat(Lt[Ct]));break;case 246:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])([[Lt[Ct-1],Lt[Ct]]]);break;case 247:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])([[Lt[Ct-2],Lt[Ct-1]]]);break;case 248:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct-1],Lt[Ct],{type:Lt[Ct-2]}));break;case 249:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(Lt[Ct-4].addElse(Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct-1],Lt[Ct],{type:Lt[Ct-2]}))));break;case 251:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(Lt[Ct-2].addElse(Lt[Ct]));break;case 252:case 253:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.If(Lt[Ct],Tt.addLocationDataFn(Nt[Ct-2])(Tt.Block.wrap([Lt[Ct-2]])),{type:Lt[Ct-1],statement:!0}));break;case 256:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("-",Lt[Ct]));break;case 257:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("+",Lt[Ct]));break;case 259:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("--",Lt[Ct]));break;case 260:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("++",Lt[Ct]));break;case 261:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("--",Lt[Ct-1],null,!0));break;case 262:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Op("++",Lt[Ct-1],null,!0));break;case 263:this.$=Tt.addLocationDataFn(Nt[Ct-1],Nt[Ct])(new Tt.Existence(Lt[Ct-1]));break;case 264:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op("+",Lt[Ct-2],Lt[Ct]));break;case 265:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op("-",Lt[Ct-2],Lt[Ct]));break;case 266:case 267:case 268:case 269:case 270:case 271:case 272:case 273:case 274:case 275:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Op(Lt[Ct-1],Lt[Ct-2],Lt[Ct]));break;case 276:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(function(){return"!"===Lt[Ct-1].charAt(0)?new Tt.Op(Lt[Ct-1].slice(1),Lt[Ct-2],Lt[Ct]).invert():new Tt.Op(Lt[Ct-1],Lt[Ct-2],Lt[Ct])}());break;case 277:this.$=Tt.addLocationDataFn(Nt[Ct-2],Nt[Ct])(new Tt.Assign(Lt[Ct-2],Lt[Ct],Lt[Ct-1]));break;case 278:this.$=Tt.addLocationDataFn(Nt[Ct-4],Nt[Ct])(new Tt.Assign(Lt[Ct-4],Lt[Ct-1],Lt[Ct-3]));break;case 279:this.$=Tt.addLocationDataFn(Nt[Ct-3],Nt[Ct])(new Tt.Assign(Lt[Ct-3],Lt[Ct],Lt[Ct-2]));}},table:[{1:[2,1],3:1,4:2,5:3,7:4,8:5,9:6,10:25,11:26,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:g,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:R,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{1:[3]},{1:[2,2],6:se},f(de,[2,3]),f(de,[2,6],{144:80,135:105,141:106,136:J,138:K,142:Q,159:ce,162:pe,163:ue,166:fe,167:he,168:ge,169:ye,170:ke,171:ve,172:be,173:$e,174:Te,175:Le,176:Ne,177:Ce}),f(de,[2,7],{144:80,135:108,141:109,136:J,138:K,142:Q,159:Fe}),f(de,[2,8]),f(De,[2,16],{114:110,81:111,93:117,42:Ee,43:Ee,117:Ee,87:xe,88:Ie,90:Se,91:Re,92:Ae,95:Oe,116:Pe}),f(De,[2,17],{93:117,114:120,81:121,87:xe,88:Ie,90:Se,91:Re,92:Ae,95:Oe,116:Pe,117:Ee}),f(De,[2,18]),f(De,[2,19]),f(De,[2,20]),f(De,[2,21]),f(De,[2,22]),f(De,[2,23]),f(De,[2,24]),f(De,[2,25]),f(De,[2,26]),f(De,[2,27]),f(De,[2,28]),f(we,[2,11]),f(we,[2,12]),f(we,[2,13]),f(we,[2,14]),f(we,[2,15]),f(de,[2,9]),f(de,[2,10]),f(je,Me,{57:[1,122]}),f(je,[2,99]),f(je,[2,100]),f(je,[2,101]),f(je,[2,102]),f(je,[2,103]),{87:[1,124],88:[1,125],114:123,116:Pe,117:Ee},f([6,33,68,73],Ue,{67:126,74:127,75:128,35:130,62:131,77:132,78:133,36:y,76:Ve,97:U,121:Be,122:He}),{32:136,33:Ge},{7:138,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{7:142,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{7:143,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{7:144,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{7:145,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:[1,146],64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},{17:148,18:149,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:150,62:74,77:57,78:58,80:147,82:29,83:30,84:31,85:32,86:M,97:U,120:G,121:Y,122:X,133:z},{17:148,18:149,35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:150,62:74,77:57,78:58,80:151,82:29,83:30,84:31,85:32,86:M,97:U,120:G,121:Y,122:X,133:z},f(We,qe,{164:[1,152],165:[1,153],178:[1,154]}),f(De,[2,250],{154:[1,155]}),{32:156,33:Ge},{32:157,33:Ge},f(De,[2,214]),{32:158,33:Ge},{7:159,8:140,12:20,13:21,14:h,15:23,16:24,17:7,18:8,19:9,20:10,21:11,22:12,23:13,24:14,25:15,26:16,27:17,28:18,29:19,30:Ye,33:[1,160],35:73,36:y,39:59,40:b,41:83,42:T,43:_,45:61,46:L,47:N,49:28,50:C,51:F,52:D,53:E,54:x,55:I,56:27,62:74,63:S,64:Xe,65:A,66:O,69:35,70:P,71:w,77:57,78:58,80:43,82:29,83:30,84:31,85:32,86:M,97:U,100:V,102:B,110:H,120:G,121:Y,122:X,128:W,132:q,133:z,135:46,136:J,138:K,139:47,140:Z,141:48,142:Q,144:80,152:ee,157:44,158:ae,160:te,161:ne,162:oe,163:re,164:ie,165:le},f(ze,[2,122],{49:28,82:29,83:30,84:31,85:32,77:57,78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qa=Pa;Ea=qa.variable.base,Pa=qa.value,Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable)}else Pa instanceof ba&&(Na=Pa.value,Pa=Pa.variable),Ea=xa?Pa.this?Pa.properties[0].name:new ve(Pa.unwrap().value):new ue(0);return Ta=Ea.unwrap()instanceof ve,Ha=new He(Ha),Ha.properties.push(new(Ta?c:z)(Ea)),Aa=ta(Pa.unwrap().value),Aa&&Pa.error(Aa),Na&&(Na.isDefaultValue=!0,Ha=new he("?",Ha,Na)),new ba(Pa,Ha,null,{param:this.param}).compileToFragments($a,ne)}for(Ga=Ha.compileToFragments($a,ee),Ya=Qe(Ga),_a=[],Ca=!1,(!(Ha.unwrap()instanceof U)||this.variable.assigns(Ya))&&(Ma=$a.scope.freeVariable("ref"),_a.push([this.makeCode(Ma+" = ")].concat(_toConsumableArray(Ga))),Ga=[this.makeCode(Ma)],Ya=Ma),(Da=Sa=0,Ra=wa.length);Sa<Ra;Da=++Sa){if(Pa=wa[Da],Ea=Da,!Ca&&Pa instanceof De)Oa=Pa.name.unwrap().value,Pa=Pa.unwrap(),Ba=ja+" <= "+Ya+".length ? 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La=this.variable.cacheReference($a),Na=_slicedToArray(La,2),Ta,_a;return Ta=Na[0],_a=Na[1],new ba(Ta,new he(this.context.slice(0,-1),_a,this.value)).compileToFragments($a)}},{key:"compileSplice",value:function compileSplice($a){var Ia=this.variable.properties.pop(),Sa=Ia.range,Ta,_a,La,Na,Ca,Fa,Da,Ea,xa;if(La=Sa.from,Da=Sa.to,_a=Sa.exclusive,Fa=this.variable.compile($a),La){var Ra=this.cacheToCodeFragments(La.cache($a,ae)),Aa=_slicedToArray(Ra,2);Na=Aa[0],Ca=Aa[1]}else Na=Ca="0";Da?(null==La?void 0:La.isNumber())&&Da.isNumber()?(Da=Da.compile($a)-Ca,!_a&&(Da+=1)):(Da=Da.compile($a,Z)+" - "+Ca,!_a&&(Da+=" + 1")):Da="9e9";var Oa=this.value.cache($a,ee),Pa=_slicedToArray(Oa,2);return Ea=Pa[0],xa=Pa[1],Ta=[].concat(this.makeCode(pa("splice",$a)+".apply("+Fa+", ["+Na+", "+Da+"].concat("),Ea,this.makeCode(")), "),xa),$a.level>ne?this.wrapInParentheses(Ta):Ta}},{key:"eachName",value:function eachName($a){return this.variable.unwrapAll().eachName($a)}}]),ba}(g);return ka.prototype.children=["variable","value"],ka.prototype.isAssignable=Ye,ka}(),t.Code=L=function(){var ka=function(va){function ba($a,Ta,_a){_classCallCheck(this,ba);var La=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return La.params=$a||[],La.body=Ta||new y,La.bound="boundfunc"===_a,La.isGenerator=!1,La.isAsync=!1,La.isMethod=!1,La.body.traverseChildren(!1,function(Na){if((Na instanceof he&&Na.isYield()||Na instanceof Xe)&&(La.isGenerator=!0),(Na instanceof he&&Na.isAwait()||Na instanceof h)&&(La.isAsync=!0),La.isGenerator&&La.isAsync)return Na.error("function can't contain both yield and await")}),La}return _inherits(ba,va),_createClass(ba,[{key:"isStatement",value:function isStatement(){return this.isMethod}},{key:"makeScope",value:function makeScope($a){return new Ce($a,this.body,this)}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca,Fa,Da,Ea,xa,Ia,Sa,Ra,Aa,Oa,Pa,wa,ja,Ma,Ua,Va,Ba,Ha,Ga,Ya,Xa,Wa,qa,za,Ja,Ka,Za,Qa;for(this.ctor&&(this.isAsync&&this.name.error("Class constructor may not be async"),this.isGenerator&&this.name.error("Class constructor may not be a generator")),this.bound&&((null==(Ya=$a.scope.method)?void 0:Ya.bound)&&(this.context=$a.scope.method.context),!this.context&&(this.context="this")),$a.scope=ze($a,"classScope")||this.makeScope($a.scope),$a.scope.shared=ze($a,"sharedScope"),$a.indent+=Oe,delete $a.bare,delete $a.isExistentialEquals,Ba=[],Fa=[],Za=null==(Xa=null==(Wa=this.thisAssignments)?void 0:Wa.slice())?[]:Xa,Ha=[],Ea=!1,Da=!1,Va=[],this.eachParamName(function(rt,it,st){var dt;if(0<=ma.call(Va,rt)&&it.error("multiple parameters named '"+rt+"'"),Va.push(rt),it.this)return rt=it.properties[0].name.value,0<=ma.call(K,rt)&&(rt="_"+rt),dt=new U($a.scope.freeVariable(rt)),st.renameParam(it,dt),Za.push(new f(it,dt))}),qa=this.params,(xa=Sa=0,Aa=qa.length);Sa<Aa;xa=++Sa)Ua=qa[xa],Ua.splat||Ua instanceof E?(Ea?Ua.error("only one splat or expansion parameter is allowed per function definition"):Ua instanceof E&&1===this.params.length&&Ua.error("an expansion parameter cannot be the only parameter in a function definition"),Ea=!0,Ua.splat?(Ua.name instanceof u?(Ka=$a.scope.freeVariable("arg"),Ba.push(Ga=new He(new U(Ka))),Fa.push(new f(new He(Ua.name),Ga,null,{param:!0}))):(Ba.push(Ga=Ua.asReference($a)),Ka=Qe(Ga.compileNode($a))),Ua.shouldCache()&&Fa.push(new f(new He(Ua.name),Ga,null,{param:!0}))):(Ka=$a.scope.freeVariable("args"),Ba.push(new He(new U(Ka)))),$a.scope.parameter(Ka)):((Ua.shouldCache()||Da)&&(Ua.assignedInBody=!0,Da=!0,null==Ua.value?Fa.push(new f(new He(Ua.name),Ua.asReference($a),null,{param:!0})):(Ca=new he("===",Ua,new Be()),Ia=new f(new He(Ua.name),Ua.value,null,{param:!0}),Fa.push(new V(Ca,Ia)))),Ea?(Ha.push(Ua),null!=Ua.value&&!Ua.shouldCache()&&(Ca=new he("===",Ua,new 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et;(et=this.body.expressions).unshift.apply(et,_toConsumableArray(Za))}for((Ta=this.body.expressions).unshift.apply(Ta,_toConsumableArray(Fa)),Qa||this.noReturn||this.body.makeReturn(),ja=[],this.isMethod&&this.isStatic&&ja.push("static"),this.isAsync&&ja.push("async"),this.isMethod||this.bound?this.isGenerator&&ja.push("*"):ja.push("function"+(this.isGenerator?"*":"")),Ja=[this.makeCode("(")],(xa=Ra=0,Oa=Ba.length);Ra<Oa;xa=++Ra){var at;Ua=Ba[xa],xa&&Ja.push(this.makeCode(", ")),Ea&&xa===Ba.length-1&&Ja.push(this.makeCode("...")),(at=Ja).push.apply(at,_toConsumableArray(Ua.compileToFragments($a)))}if(Ja.push(this.makeCode(")")),this.body.isEmpty()||(Na=this.body.compileWithDeclarations($a)),this.isMethod){var tt=[$a.scope,$a.scope.parent];wa=tt[0],$a.scope=tt[1],Ma=this.name.compileToFragments($a),"."===Ma[0].code&&Ma.shift(),$a.scope=wa}if(La=this.joinFragmentArrays(function(){var rt,it,st;for(st=[],rt=0,it=ja.length;rt<it;rt++)Pa=ja[rt],st.push(this.makeCode(Pa));return st}.call(this)," "),ja.length&&Ma&&La.push(this.makeCode(" ")),Ma){var nt;(nt=La).push.apply(nt,_toConsumableArray(Ma))}if((_a=La).push.apply(_a,_toConsumableArray(Ja)),this.bound&&!this.isMethod&&La.push(this.makeCode(" =>")),La.push(this.makeCode(" {")),null==Na?void 0:Na.length){var ot;(ot=La).push.apply(ot,[this.makeCode("\n")].concat(_toConsumableArray(Na),[this.makeCode("\n"+this.tab)]))}return La.push(this.makeCode("}")),this.isMethod?[this.makeCode(this.tab)].concat(_toConsumableArray(La)):this.front||$a.level>=Z?this.wrapInParentheses(La):La}},{key:"eachParamName",value:function eachParamName($a){var Ta,_a,La,Na,Ca;for(Na=this.params,Ca=[],(Ta=0,_a=Na.length);Ta<_a;Ta++)La=Na[Ta],Ca.push(La.eachName($a));return Ca}},{key:"traverseChildren",value:function traverseChildren($a,Ta){if($a)return _get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"traverseChildren",this).call(this,$a,Ta)}},{key:"replaceInContext",value:function replaceInContext($a,Ta){return!!this.bound&&_get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"replaceInContext",this).call(this,$a,Ta)}},{key:"expandCtorSuper",value:function expandCtorSuper($a){var Ta=this,_a,La,Na,Ca;return!!this.ctor&&(this.eachSuperCall(y.wrap(this.params),function(Fa){return Fa.error("'super' is not allowed in constructor parameter defaults")}),Ca=this.eachSuperCall(this.body,function(Fa){return"base"===Ta.ctor&&Fa.error("'super' is only allowed in derived class constructors"),Fa.expressions=$a}),_a=$a.length&&$a.length!==(null==(Na=this.thisAssignments)?void 0:Na.length),"derived"===this.ctor&&!Ca&&_a&&(La=$a[0].variable,La.error("Can't use @params in derived class constructors without calling super")),Ca)}},{key:"eachSuperCall",value:function eachSuperCall($a,Ta){var _a=this,La;return La=!1,$a.traverseChildren(!0,function(Na){return Na instanceof Re?(La=!0,Ta(Na)):Na instanceof je&&"derived"===_a.ctor&&!La&&Na.error("Can't reference 'this' before 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U($a.scope.freeVariable("arg"))),_a=new He(_a),_a.updateLocationDataIfMissing(this.locationData),this.reference=_a)}},{key:"shouldCache",value:function shouldCache(){return this.name.shouldCache()}},{key:"eachName",value:function eachName($a){var Ta=this,_a=1<arguments.length&&void 0!==arguments[1]?arguments[1]:this.name,La,Na,Ca,Fa,Da,Ea,xa;if(La=function atParam(Ia){return $a("@"+Ia.properties[0].name.value,Ia,Ta)},_a instanceof oe)return $a(_a.value,_a,this);if(_a instanceof He)return La(_a);for(xa=null==(Ea=_a.objects)?[]:Ea,Na=0,Ca=xa.length;Na<Ca;Na++)Da=xa[Na],Da instanceof f&&null==Da.context&&(Da=Da.variable),Da instanceof f?(Da.value instanceof f&&(Da=Da.value),this.eachName($a,Da.value.unwrap())):Da instanceof De?(Fa=Da.name.unwrap(),$a(Fa.value,Fa,this)):Da instanceof He?Da.isArray()||Da.isObject()?this.eachName($a,Da.base):Da.this?La(Da):$a(Da.base.value,Da.base,this):!(Da instanceof E)&&Da.error("illegal parameter "+Da.compile())}},{key:"renameParam",value:function renameParam($a,Ta){var _a,La;return _a=function isNode(Na){return Na===$a},La=function replacement(Na,Ca){var Fa;return Ca instanceof fe?(Fa=Na,Na.this&&(Fa=Na.properties[0].name),new f(new He(Fa),Ta,"object")):Ta},this.replaceInContext(_a,La)}}]),ba}(g);return ka.prototype.children=["name","value"],ka}(),t.Splat=De=function(){var ka=function(va){function ba($a){_classCallCheck(this,ba);var Ta=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return Ta.name=$a.compile?$a:new oe($a),Ta}return _inherits(ba,va),_createClass(ba,[{key:"isAssignable",value:function isAssignable(){return this.name.isAssignable()&&(!this.name.isAtomic||this.name.isAtomic())}}]),_createClass(ba,[{key:"assigns",value:function assigns($a){return this.name.assigns($a)}},{key:"compileToFragments",value:function compileToFragments($a){return[this.makeCode("...")].concat(_toConsumableArray(this.name.compileToFragments($a)))}},{key:"unwrap",value:function unwrap(){return this.name}}]),ba}(g);return ka.prototype.children=["name"],ka}(),t.Expansion=E=function(){var ka=function(va){function ba(){return _classCallCheck(this,ba),_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).apply(this,arguments))}return _inherits(ba,va),_createClass(ba,[{key:"compileNode",value:function compileNode(){return this.error("Expansion must be used inside a destructuring assignment or parameter list")}},{key:"asReference",value:function asReference(){return this}},{key:"eachName",value:function eachName(){}}]),ba}(g);return ka.prototype.shouldCache=de,ka}(),t.While=Ge=function(){var ka=function(va){function ba($a,Ta){_classCallCheck(this,ba);var _a=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return _a.condition=(null==Ta?void 0:Ta.invert)?$a.invert():$a,_a.guard=null==Ta?void 0:Ta.guard,_a}return _inherits(ba,va),_createClass(ba,[{key:"makeReturn",value:function makeReturn($a){return $a?_get(ba.prototype.__proto__||Object.getPrototypeOf(ba.prototype),"makeReturn",this).call(this,$a):(this.returns=!this.jumps({loop:!0}),this)}},{key:"addBody",value:function addBody($a){return this.body=$a,this}},{key:"jumps",value:function jumps(){var $a,Ta,_a,La,Na;if($a=this.body.expressions,!$a.length)return!1;for(Ta=0,La=$a.length;Ta<La;Ta++)if(Na=$a[Ta],_a=Na.jumps({loop:!0}))return _a;return!1}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na;return $a.indent+=Oe,Na="",_a=this.body,_a.isEmpty()?_a=this.makeCode(""):(this.returns&&(_a.makeReturn(La=$a.scope.freeVariable("results")),Na=""+this.tab+La+" = [];\n"),this.guard&&(1<_a.expressions.length?_a.expressions.unshift(new V(new ye(this.guard).invert(),new Ee("continue"))):this.guard&&(_a=y.wrap([new V(this.guard,_a)]))),_a=[].concat(this.makeCode("\n"),_a.compileToFragments($a,ne),this.makeCode("\n"+this.tab))),Ta=[].concat(this.makeCode(Na+this.tab+"while 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_a;return this.isUnary()&&("+"===(_a=this.operator)||"-"===_a)&&this.first instanceof He&&this.first.isNumber()}},{key:"isAwait",value:function isAwait(){return"await"===this.operator}},{key:"isYield",value:function isYield(){var _a;return"yield"===(_a=this.operator)||"yield*"===_a}},{key:"isUnary",value:function isUnary(){return!this.second}},{key:"shouldCache",value:function shouldCache(){return!this.isNumber()}},{key:"isChainable",value:function isChainable(){var _a;return"<"===(_a=this.operator)||">"===_a||">="===_a||"<="===_a||"==="===_a||"!=="===_a}},{key:"invert",value:function invert(){var _a,La,Na,Ca,Fa;if(this.isChainable()&&this.first.isChainable()){for(_a=!0,La=this;La&&La.operator;)_a&&(_a=La.operator in va),La=La.first;if(!_a)return new ye(this).invert();for(La=this;La&&La.operator;)La.invert=!La.invert,La.operator=va[La.operator],La=La.first;return this}return(Ca=va[this.operator])?(this.operator=Ca,this.first.unwrap()instanceof Ta&&this.first.invert(),this):this.second?new ye(this).invert():"!"===this.operator&&(Na=this.first.unwrap())instanceof Ta&&("!"===(Fa=Na.operator)||"in"===Fa||"instanceof"===Fa)?Na:new Ta("!",this)}},{key:"unfoldSoak",value:function unfoldSoak(_a){var La;return("++"===(La=this.operator)||"--"===La||"delete"===La)&&ca(_a,this,"first")}},{key:"generateDo",value:function generateDo(_a){var La,Na,Ca,Fa,Da,Ea,xa,Ia;for(Ea=[],Na=_a instanceof f&&(xa=_a.value.unwrap())instanceof L?xa:_a,Ia=Na.params||[],(Ca=0,Fa=Ia.length);Ca<Fa;Ca++)Da=Ia[Ca],Da.value?(Ea.push(Da.value),delete Da.value):Ea.push(Da);return La=new T(_a,Ea),La.do=!0,La}},{key:"compileNode",value:function compileNode(_a){var La,Na,Ca,Fa,Da,Ea;if(Na=this.isChainable()&&this.first.isChainable(),Na||(this.first.front=this.front),"delete"===this.operator&&_a.scope.check(this.first.unwrapAll().value)&&this.error("delete operand may not be argument or 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_a=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return _a.object=$a,_a.array=Ta,_a}return _inherits(ba,va),_createClass(ba,[{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca;if(this.array instanceof He&&this.array.isArray()&&this.array.base.objects.length){for(Ca=this.array.base.objects,_a=0,La=Ca.length;_a<La;_a++)if(Na=Ca[_a],!!(Na instanceof De)){Ta=!0;break}if(!Ta)return this.compileOrTest($a)}return this.compileLoopTest($a)}},{key:"compileOrTest",value:function compileOrTest($a){var Sa=this.object.cache($a,ae),Ra=_slicedToArray(Sa,2),Ta,_a,La,Na,Ca,Fa,Da,Ea,xa,Ia;xa=Ra[0],Da=Ra[1];var Aa=this.negated?[" !== "," && "]:[" === "," || "],Oa=_slicedToArray(Aa,2);for(Ta=Oa[0],_a=Oa[1],Ia=[],Ea=this.array.base.objects,(La=Ca=0,Fa=Ea.length);Ca<Fa;La=++Ca)Na=Ea[La],La&&Ia.push(this.makeCode(_a)),Ia=Ia.concat(La?Da:xa,this.makeCode(Ta),Na.compileToFragments($a,Z));return 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_inherits(ba,va),_createClass(ba,[{key:"jumps",value:function jumps($a){var Ta;return this.attempt.jumps($a)||(null==(Ta=this.recovery)?void 0:Ta.jumps($a))}},{key:"makeReturn",value:function makeReturn($a){return this.attempt&&(this.attempt=this.attempt.makeReturn($a)),this.recovery&&(this.recovery=this.recovery.makeReturn($a)),this}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca,Fa;return $a.indent+=Oe,Fa=this.attempt.compileToFragments($a,ne),Ta=this.recovery?(La=$a.scope.freeVariable("error",{reserve:!1}),Ca=new U(La),this.errorVariable?(Na=ta(this.errorVariable.unwrapAll().value),Na?this.errorVariable.error(Na):void 0,this.recovery.unshift(new f(this.errorVariable,Ca))):void 0,[].concat(this.makeCode(" catch ("),Ca.compileToFragments($a),this.makeCode(") {\n"),this.recovery.compileToFragments($a,ne),this.makeCode("\n"+this.tab+"}"))):this.ensure||this.recovery?[]:(La=$a.scope.freeVariable("error",{reserve:!1}),[this.makeCode(" catch ("+La+") 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0!==arguments[1]&&arguments[1];_classCallCheck(this,ba);var _a=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return _a.expression=$a,_a.comparisonTarget=Ta?"undefined":"null",_a}return _inherits(ba,va),_createClass(ba,[{key:"compileNode",value:function compileNode($a){var Ta,_a,La;if(this.expression.front=this.front,La=this.expression.compile($a,ae),this.expression.unwrap()instanceof U&&!$a.scope.check(La)){var Na=this.negated?["===","||"]:["!==","&&"],Ca=_slicedToArray(Na,2);Ta=Ca[0],_a=Ca[1],La="typeof "+La+" "+Ta+" \"undefined\""+("undefined"===this.comparisonTarget?"":" "+_a+" "+La+" "+Ta+" "+this.comparisonTarget)}else Ta="null"===this.comparisonTarget?this.negated?"==":"!=":this.negated?"===":"!==",La=La+" "+Ta+" "+this.comparisonTarget;return[this.makeCode($a.level<=Q?La:"("+La+")")]}}]),ba}(g);return ka.prototype.children=["expression"],ka.prototype.invert=se,ka}(),t.Parens=ye=function(){var ka=function(va){function ba($a){_classCallCheck(this,ba);var Ta=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return Ta.body=$a,Ta}return _inherits(ba,va),_createClass(ba,[{key:"unwrap",value:function unwrap(){return this.body}},{key:"shouldCache",value:function shouldCache(){return this.body.shouldCache()}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La;return(_a=this.body.unwrap(),_a instanceof He&&_a.isAtomic())?(_a.front=this.front,_a.compileToFragments($a)):(La=_a.compileToFragments($a,te),Ta=$a.level<ae&&(_a instanceof he||_a instanceof T||_a instanceof w&&_a.returns)&&($a.level<Q||3>=La.length),Ta?La:this.wrapInParentheses(La))}}]),ba}(g);return ka.prototype.children=["body"],ka}(),t.StringWithInterpolations=Ie=function(){var ka=function(va){function ba($a){_classCallCheck(this,ba);var Ta=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return Ta.body=$a,Ta}return _inherits(ba,va),_createClass(ba,[{key:"unwrap",value:function unwrap(){return this}},{key:"shouldCache",value:function shouldCache(){return this.body.shouldCache()}},{key:"compileNode",value:function compileNode($a){var Ta,_a,La,Na,Ca,Fa,Da;for(La=this.body.unwrap(),_a=[],La.traverseChildren(!1,function(xa){return xa instanceof xe?(_a.push(xa),!0):!(xa instanceof ye)||(_a.push(xa),!1)}),Na=[],Na.push(this.makeCode("`")),(Ca=0,Fa=_a.length);Ca<Fa;Ca++)if(Ta=_a[Ca],Ta instanceof xe)Da=Ta.value.slice(1,-1),Da=Da.replace(/(\\*)(`|\$\{)/g,function(xa,Ia,Sa){return 0==Ia.length%2?Ia+"\\"+Sa:xa}),Na.push(this.makeCode(Da));else{var Ea;Na.push(this.makeCode("${")),(Ea=Na).push.apply(Ea,_toConsumableArray(Ta.compileToFragments($a,te))),Na.push(this.makeCode("}"))}return Na.push(this.makeCode("`")),Na}}]),ba}(g);return ka.prototype.children=["body"],ka}(),t.For=w=function(){var ka=function(va){function ba($a,Ta){_classCallCheck(this,ba);var Na=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this)),_a,La;if(Na.source=Ta.source,Na.guard=Ta.guard,Na.step=Ta.step,Na.name=Ta.name,Na.index=Ta.index,Na.body=y.wrap([$a]),Na.own=!!Ta.own,Na.object=!!Ta.object,Na.from=!!Ta.from,Na.from&&Na.index&&Na.index.error("cannot use index with for-from"),Na.own&&!Na.object&&Ta.ownTag.error("cannot use own with for-"+(Na.from?"from":"in")),Na.object){var Ca=[Na.index,Na.name];Na.name=Ca[0],Na.index=Ca[1]}return((null==(_a=Na.index)?void 0:"function"==typeof _a.isArray?_a.isArray():void 0)||(null==(La=Na.index)?void 0:"function"==typeof La.isObject?La.isObject():void 0))&&Na.index.error("index cannot be a pattern matching expression"),Na.range=Na.source instanceof He&&Na.source.base instanceof be&&!Na.source.properties.length&&!Na.from,Na.pattern=Na.name instanceof He,Na.range&&Na.index&&Na.index.error("indexes do not apply to range loops"),Na.range&&Na.pattern&&Na.name.error("cannot pattern match over range 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this.pattern&&(Va=Pa),et="",Sa="",Da="",Ra=this.tab+Oe,this.range?Ia=za.compileToFragments(oa($a,{index:Pa,name:Va,step:this.step,shouldCache:ia})):(Qa=this.source.compile($a,ee),(Va||this.own)&&!(this.source.unwrap()instanceof U)&&(Da+=""+this.tab+(Ha=qa.freeVariable("ref"))+" = "+Qa+";\n",Qa=Ha),Va&&!this.pattern&&!this.from&&(Ba=Va+" = "+Qa+"["+wa+"]"),!this.object&&!this.from&&(Ja!==Za&&(Da+=""+this.tab+Ja+";\n"),xa=0>Ka,!(this.step&&null!=Ka&&xa)&&(Ua=qa.freeVariable("len")),Ca=""+ja+Pa+" = 0, "+Ua+" = "+Qa+".length",Fa=""+ja+Pa+" = "+Qa+".length - 1",La=Pa+" < "+Ua,Na=Pa+" >= 0",this.step?(null==Ka?(La=Za+" > 0 ? 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ka.prototype.children=["subject","cases","otherwise"],ka.prototype.isStatement=Ye,ka}(),t.If=V=function(){var ka=function(va){function ba($a,Ta){var _a=2<arguments.length&&void 0!==arguments[2]?arguments[2]:{};_classCallCheck(this,ba);var La=_possibleConstructorReturn(this,(ba.__proto__||Object.getPrototypeOf(ba)).call(this));return La.body=Ta,La.condition="unless"===_a.type?$a.invert():$a,La.elseBody=null,La.isChain=!1,La.soak=_a.soak,La}return _inherits(ba,va),_createClass(ba,[{key:"bodyNode",value:function bodyNode(){var $a;return null==($a=this.body)?void 0:$a.unwrap()}},{key:"elseBodyNode",value:function elseBodyNode(){var $a;return null==($a=this.elseBody)?void 0:$a.unwrap()}},{key:"addElse",value:function addElse($a){return this.isChain?this.elseBodyNode().addElse($a):(this.isChain=$a instanceof ba,this.elseBody=this.ensureBlock($a),this.elseBody.updateLocationDataIfMissing($a.locationData)),this}},{key:"isStatement",value:function isStatement($a){var Ta;return(null==$a?void 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\ No newline at end of file
diff --git a/docs/v2/index.html b/docs/v2/index.html
index 9d0ecb0e4f..32bcc0dc87 100644
--- a/docs/v2/index.html
+++ b/docs/v2/index.html
@@ -617,16 +617,25 @@
           <a href="#existential-operator" class="nav-link" data-action="sidebar-nav">Existential Operator</a>
         </li>
         <li class="nav-item">
-          <a href="#classes" class="nav-link" data-action="sidebar-nav">Classes</a>
+          <a href="#destructuring" class="nav-link" data-action="sidebar-nav">Destructuring Assignment</a>
         </li>
         <li class="nav-item">
-          <a href="#prototypal-inheritance" class="nav-link" data-action="sidebar-nav">Prototypal Inheritance</a>
+          <a href="#chaining" class="nav-link" data-action="sidebar-nav">Chaining Function Calls</a>
         </li>
         <li class="nav-item">
-          <a href="#destructuring" class="nav-link" data-action="sidebar-nav">Destructuring Assignment</a>
+          <a href="#fat-arrow" class="nav-link" data-action="sidebar-nav">Bound (Fat Arrow) Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#generators" class="nav-link" data-action="sidebar-nav">Generator Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#async-functions" class="nav-link" data-action="sidebar-nav">Async Functions</a>
         </li>
         <li class="nav-item">
-          <a href="#fat-arrow" class="nav-link" data-action="sidebar-nav">Function Modifiers</a>
+          <a href="#classes" class="nav-link" data-action="sidebar-nav">Classes</a>
+        </li>
+        <li class="nav-item">
+          <a href="#prototypal-inheritance" class="nav-link" data-action="sidebar-nav">Prototypal Inheritance</a>
         </li>
         <li class="nav-item">
           <a href="#switch" class="nav-link" data-action="sidebar-nav">Switch and Try/Catch</a>
@@ -646,9 +655,6 @@
         <li class="nav-item">
           <a href="#embedded" class="nav-link" data-action="sidebar-nav">Embedded JavaScript</a>
         </li>
-        <li class="nav-item">
-          <a href="#unsupported" class="nav-link" data-action="sidebar-nav">Unsupported ECMAScript Features</a>
-        </li>
       </ul>
     </li>
     <li class="nav-item">
@@ -689,8 +695,39 @@
         </li>
       </ul>
     </li>
+    <li class="nav-item">
+      <a href="#unsupported" class="nav-link" data-action="sidebar-nav">Unsupported ECMAScript Features</a>
+      <ul class="nav">
+        <li class="nav-item">
+          <a href="#unsupported-let-const" class="nav-link" data-action="sidebar-nav"><code>let</code> and <code>const</code></a>
+        </li>
+        <li class="nav-item">
+          <a href="#unsupported-named-functions" class="nav-link" data-action="sidebar-nav">Named Functions and Function Declarations</a>
+        </li>
+        <li class="nav-item">
+          <a href="#unsupported-get-set" class="nav-link" data-action="sidebar-nav"><code>get</code> and <code>set</code> Shorthand Syntax</a>
+        </li>
+      </ul>
+    </li>
     <li class="nav-item">
       <a href="#breaking-changes" class="nav-link" data-action="sidebar-nav">Breaking Changes From 1.x</a>
+      <ul class="nav">
+        <li class="nav-item">
+          <a href="#breaking-changes-default-values" class="nav-link" data-action="sidebar-nav">Default Values</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-bound-generator-functions" class="nav-link" data-action="sidebar-nav">Bound Generator Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-classes" class="nav-link" data-action="sidebar-nav">Classes</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-super-extends" class="nav-link" data-action="sidebar-nav"><code>super</code> and <code>extends</code></a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-literate-coffeescript" class="nav-link" data-action="sidebar-nav">Literate CoffeeScript Parsing</a>
+        </li>
+      </ul>
     </li>
     <li class="nav-item">
       <a href="#changelog" class="nav-link" data-action="sidebar-nav">Change Log</a>
@@ -810,18 +847,15 @@ <h2>Overview</h2>
       </section>
       <section id="coffeescript-2">
         <h2>CoffeeScript 2</h2>
-<h3>Why CoffeeScript When There’s ES2015+?</h3>
+<h3>What’s New In CoffeeScript 2?</h3>
+<p>The biggest change in CoffeeScript 2 is that now the CoffeeScript compiler produces modern, ES2015+ JavaScript. A CoffeeScript <code>=&gt;</code> becomes an ES <code>=&gt;</code>, a CoffeeScript <code>class</code> becomes an ES <code>class</code> and so on. With the exception of modules (<code>import</code> and <code>export</code> statements), all the ES2015+ features that CoffeeScript supports can run natively in Node 7.6+, meaning that Node can run CoffeeScript’s output without any further processing required. You can <a href="http://coffeescript.org/v2/test.html">run the tests in your browser</a> to see if your browser can do the same; Chrome has supported all features since version 55.</p>
+<p>Support for ES2015+ syntax is important to ensure compatibility with frameworks that assume ES2015. Now that CoffeeScript compiles classes to the ES <code>class</code> keyword, it’s possible to <code>extend</code> an ES class; that wasn’t possible in CoffeeScript 1. Parity in how language features work is also important on its own; CoffeeScript “is just JavaScript,” and so things like <a href="#breaking-changes-default-values">function parameter default values</a> should behave the same in CoffeeScript as in JavaScript.</p>
+<p>Many ES2015+ features have been backported to CoffeeScript 1.11 and 1.12, including <a href="#modules">modules</a>, <a href="#generator-iteration"><code>for…of</code></a>, and <a href="#tagged-template-literals">tagged template literals</a>. One major new feature unique to CoffeeScript 2 is support for ES2017’s <a href="#async-functions">async functions</a>. More details are in the <a href="#changelog">changelog</a>.</p>
+<p>There are very few <a href="#breaking-changes">breaking changes from CoffeeScript 1.x to 2</a>; we hope the upgrade process is smooth for most projects.</p>
+<h3>Why CoffeeScript When There’s ES2015?</h3>
 <p>CoffeeScript introduced many new features to the JavaScript world, such as <a href="#fat-arrow"><code>=&gt;</code></a> and <a href="#destructuring">destructuring</a> and <a href="#classes">classes</a>. We are happy that ECMA has seen their utility and adopted them into ECMAScript.</p>
-<p>CoffeeScript’s intent, however, was never to be a superset of JavaScript. One of the guiding principles of CoffeeScript has been <em>simplicity:</em> not just removing JavaScript’s “bad parts,” but providing a cleaner, terser syntax that uses less punctuation and enforces indentation, to make code easier to read and reason about. Increased clarity leads to increased quality, and fewer bugs. This benefit of CoffeeScript remains, even in an ES2015+ world.</p>
-<h3>ES2015+ Output</h3>
-<p>CoffeeScript 2 supports many of the latest ES2015+ features, output using ES2015+ syntax. If you’re looking for a single tool that takes CoffeeScript input and generates JavaScript output that runs in any JavaScript runtime, assuming you opt out of certain newer features, stick to the <a href="/v1/">CoffeeScript 1.x branch</a>. CoffeeScript 2 <a href="#breaking-changes">breaks compatibility</a> with certain CoffeeScript 1.x features in order to conform with the ES2015+ specifications, and generate more idiomatic output (a CoffeeScript <code>=&gt;</code> becomes an ES <code>=&gt;</code>; a CoffeeScript <code>class</code> becomes an ES <code>class</code>; and so on).</p>
-<p>Since the CoffeeScript 2 compiler outputs ES2015+ syntax, it is your responsibility to either ensure that your target JavaScript runtime(s) support all these features, or that you pass the output through another transpiler like <a href="http://babeljs.io/">Babel</a>, <a href="https://github.com/rollup/rollup">Rollup</a> or <a href="https://github.com/google/traceur-compiler">Traceur Compiler</a>. In general, <a href="http://node.green/">CoffeeScript 2’s output is supported as is by Node.js 7.6+</a>, except for modules which require transpilation.</p>
-<p>There are many great task runners for setting up JavaScript build chains, such as <a href="http://gulpjs.com/">Gulp</a>, <a href="https://webpack.github.io/">Webpack</a>, <a href="https://gruntjs.com/">Grunt</a> and <a href="http://broccolijs.com/">Broccoli</a>. If you’re looking for a very minimal solution to get started, you can use <a href="https://babeljs.io/docs/plugins/preset-env/">babel-preset-env</a> and the command line:</p>
-<blockquote class="uneditable-code-block"><pre><code class="language-bash">npm install --global coffeescript@next
-npm install --save-dev coffeescript@next babel-cli babel-preset-env
-coffee -p *.coffee | babel --presets env &gt; app.js
-</code></pre>
-</blockquote>
+<p>CoffeeScript’s intent, however, was never to be a superset of JavaScript. One of the guiding principles of CoffeeScript has been <em>simplicity:</em> not just removing JavaScript’s “bad parts,” but providing an elegant, concise syntax that eschews unnecessary punctuation whenever possible, to make code easier to read and reason about. This benefit of CoffeeScript remains, even in an ES2015 world.</p>
+
       </section>
       <section id="installation">
         <h2>Installation</h2>
@@ -925,6 +959,33 @@ <h3>Examples:</h3>
 <code>coffee -o lib/ -cw src/</code></li>
 <li>Start the CoffeeScript REPL (<code>Ctrl-D</code> to exit, <code>Ctrl-V</code>for multi-line):<br>
 <code>coffee</code></li>
+</ul>
+<h3>ES2015+ Output</h3>
+<p>CoffeeScript 2 outputs the latest ES2015+ syntax. If you’re looking for a single tool that takes CoffeeScript input and generates JavaScript output that runs in any JavaScript runtime, assuming you opt out of certain newer features, stick to <a href="/v1/">CoffeeScript 1.x</a>. CoffeeScript 2 <a href="#breaking-changes">breaks compatibility</a> with certain CoffeeScript 1.x features in order to conform with the ES2015+ specifications, and generate more idiomatic output (a CoffeeScript <code>=&gt;</code> becomes an ES <code>=&gt;</code>; a CoffeeScript <code>class</code> becomes an ES <code>class</code>; and so on).</p>
+<p>Since the CoffeeScript 2 compiler outputs ES2015+ syntax, it is your responsibility to either ensure that your target JavaScript runtime(s) support all these features, or that you pass the output through another transpiler like <a href="http://babeljs.io/">Babel</a>, <a href="https://github.com/rollup/rollup">Rollup</a> or <a href="https://github.com/google/traceur-compiler">Traceur Compiler</a>. In general, <a href="http://node.green/">CoffeeScript 2’s output is supported as is by Node.js 7.6+</a>, except for modules which require transpilation.</p>
+<p>There are many great task runners for setting up JavaScript build chains, such as <a href="http://gulpjs.com/">Gulp</a>, <a href="https://webpack.github.io/">Webpack</a>, <a href="https://gruntjs.com/">Grunt</a> and <a href="http://broccolijs.com/">Broccoli</a>. If you’re looking for a very minimal solution to get started, you can use <a href="https://babeljs.io/docs/plugins/preset-env/">babel-preset-env</a> and the command line:</p>
+<blockquote class="uneditable-code-block"><pre><code class="language-bash">npm install --global coffeescript@next
+npm install --save-dev coffeescript@next babel-cli babel-preset-env
+coffee -p *.coffee | babel --presets env &gt; app.js
+</code></pre>
+</blockquote><h3>Node.js</h3>
+<p>If you’d like to use Node.js’ CommonJS to <code>require</code> CoffeeScript files, e.g. <code>require './app.coffee'</code>, you must first “register” CoffeeScript as an extension:</p>
+<blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="built_in">require</span> <span class="string">'coffeescript/register'</span>
+
+App = <span class="built_in">require</span> <span class="string">'./app'</span> <span class="comment"># The .coffee extension is optional</span>
+</code></pre>
+</blockquote><p>If you want to use the compiler’s API, for example to make an app that compiles strings of CoffeeScript on the fly, you can <code>require</code> the full module:</p>
+<blockquote class="uneditable-code-block"><pre><code class="language-coffee">CoffeeScript = <span class="built_in">require</span> <span class="string">'coffeescript'</span>
+
+eval CoffeeScript.compile <span class="string">'console.log "Mmmmm, I could really go for some #{Math.pi}"'</span>
+</code></pre>
+</blockquote><p>The <code>compile</code> method has the signature <code>compile(code, options)</code> where <code>code</code> is a string of CoffeeScript code, and the optional <code>options</code> is an object with some or all of the following properties:</p>
+<ul>
+<li><code>options.sourceMap</code>, boolean: if true, a source map will be generated; and instead of returning a string, <code>compile</code> will return an object of the form <code>{js, v3SourceMap, sourceMap}</code>.</li>
+<li><code>options.inlineMap</code>, boolean: if true, output the source map as a base64-encoded string in a comment at the bottom.</li>
+<li><code>options.filename</code>, string: the filename to use for the source map.</li>
+<li><code>options.bare</code>, boolean: if true, output without the <a href="#lexical-scope">top-level function safety wrapper</a>.</li>
+<li><code>options.header</code>, boolean: if true, output the <code>Generated by CoffeeScript</code> header.</li>
 </ul>
 
       </section>
@@ -1150,10 +1211,10 @@ <h2>Objects and Arrays</h2>
     </div>
     <div class="col-md-6 javascript-output-column">
       <textarea class="javascript-output" id="objects_reserved-js">$('.account').prop({
-  "class": 'active'
+  class: 'active'
 });
 
-log(object["class"]);
+log(object.class);
 </textarea>
     </div>
   </div>
@@ -1267,16 +1328,17 @@ <h2>Lexical Scoping and Variable Safety</h2>
   </div>
   
 </aside>
-<p>Notice how all of the variable declarations have been pushed up to the top of the closest scope, the first time they appear. <strong>outer</strong> is not redeclared within the inner function, because it’s already in scope; <strong>inner</strong> within the function, on the other hand, should not be able to change the value of the external variable of the same name, and therefore has a declaration of its own.</p>
-<p>This behavior is effectively identical to Ruby’s scope for local variables. Because you don’t have direct access to the <code>var</code> keyword, it’s impossible to shadow an outer variable on purpose, you may only refer to it. So be careful that you’re not reusing the name of an external variable accidentally, if you’re writing a deeply nested function.</p>
-<p>Although suppressed within this documentation for clarity, all CoffeeScript output is wrapped in an anonymous function: <code>(function(){ … })();</code> This safety wrapper, combined with the automatic generation of the <code>var</code> keyword, make it exceedingly difficult to pollute the global namespace by accident.</p>
-<p>If you’d like to create top-level variables for other scripts to use, attach them as properties on <strong>window</strong>; attach them as properties on the <strong>exports</strong> object in CommonJS; or use an <a href="#modules"><code>export</code> statement</a>. If you’re targeting both CommonJS and the browser, the <strong>existential operator</strong> (covered below), gives you a reliable way to figure out where to add them: <code>exports ? this</code></p>
+<p>Notice how all of the variable declarations have been pushed up to the top of the closest scope, the first time they appear. <code>outer</code> is not redeclared within the inner function, because it’s already in scope; <code>inner</code> within the function, on the other hand, should not be able to change the value of the external variable of the same name, and therefore has a declaration of its own.</p>
+<p>Because you don’t have direct access to the <code>var</code> keyword, it’s impossible to shadow an outer variable on purpose, you may only refer to it. So be careful that you’re not reusing the name of an external variable accidentally, if you’re writing a deeply nested function.</p>
+<p>Although suppressed within this documentation for clarity, all CoffeeScript output (except in files with <code>import</code> or <code>export</code> statements) is wrapped in an anonymous function: <code>(function(){ … })();</code>. This safety wrapper, combined with the automatic generation of the <code>var</code> keyword, make it exceedingly difficult to pollute the global namespace by accident. (The safety wrapper can be disabled with the <a href="#usage"><code>bare</code> option</a>, and is unnecessary and automatically disabled when using modules.)</p>
+<p>If you’d like to create top-level variables for other scripts to use, attach them as properties on <code>window</code>; attach them as properties on the <code>exports</code> object in CommonJS; or use an <a href="#modules"><code>export</code> statement</a>. If you’re targeting both CommonJS and the browser, the <a href="#existential-operator">existential operator</a> (covered below), gives you a reliable way to figure out where to add them: <code>exports ? this</code>.</p>
+<p>Since CoffeeScript takes care of all variable declaration, it is not possible to declare variables with ES2015’s <code>let</code> or <code>const</code>. <a href="#unsupported-let-const">This is intentional</a>; we feel that the simplicity gained by not having to think about variable declaration outweighs the benefit of having three separate ways to declare variables.</p>
 
         </section>
         <section id="conditionals">
           <h2>If, Else, Unless, and Conditional Assignment</h2>
-<p><strong>If/else</strong> statements can be written without the use of parentheses and curly brackets. As with functions and other block expressions, multi-line conditionals are delimited by indentation. There’s also a handy postfix form, with the <code>if</code> or <code>unless</code> at the end.</p>
-<p>CoffeeScript can compile <strong>if</strong> statements into JavaScript expressions, using the ternary operator when possible, and closure wrapping otherwise. There is no explicit ternary statement in CoffeeScript — you simply use a regular <strong>if</strong> statement on a single line.</p>
+<p><code>if</code>/<code>else</code> statements can be written without the use of parentheses and curly brackets. As with functions and other block expressions, multi-line conditionals are delimited by indentation. There’s also a handy postfix form, with the <code>if</code> or <code>unless</code> at the end.</p>
+<p>CoffeeScript can compile <code>if</code> statements into JavaScript expressions, using the ternary operator when possible, and closure wrapping otherwise. There is no explicit ternary statement in CoffeeScript — you simply use a regular <code>if</code> statement on a single line.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="conditionals">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1315,7 +1377,7 @@ <h2>If, Else, Unless, and Conditional Assignment</h2>
         </section>
         <section id="splats">
           <h2>Splats…</h2>
-<p>The JavaScript <strong>arguments object</strong> is a useful way to work with functions that accept variable numbers of arguments. CoffeeScript provides splats <code>...</code>, both for function definition as well as invocation, making variable numbers of arguments a little bit more palatable.</p>
+<p>The JavaScript <code>arguments</code> object is a useful way to work with functions that accept variable numbers of arguments. CoffeeScript provides splats <code>...</code>, both for function definition as well as invocation, making variable numbers of arguments a little bit more palatable.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="splats">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1381,7 +1443,7 @@ <h2>Splats…</h2>
         </section>
         <section id="loops">
           <h2>Loops and Comprehensions</h2>
-<p>Most of the loops you’ll write in CoffeeScript will be <strong>comprehensions</strong> over arrays, objects, and ranges. Comprehensions replace (and compile into) <strong>for</strong> loops, with optional guard clauses and the value of the current array index. Unlike for loops, array comprehensions are expressions, and can be returned and assigned.</p>
+<p>Most of the loops you’ll write in CoffeeScript will be <strong>comprehensions</strong> over arrays, objects, and ranges. Comprehensions replace (and compile into) <code>for</code> loops, with optional guard clauses and the value of the current array index. Unlike for loops, array comprehensions are expressions, and can be returned and assigned.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="array_comprehensions">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1426,7 +1488,7 @@ <h2>Loops and Comprehensions</h2>
   </div>
   
 </aside>
-<p>Comprehensions should be able to handle most places where you otherwise would use a loop, <strong>each</strong>/<strong>forEach</strong>, <strong>map</strong>, or <strong>select</strong>/<strong>filter</strong>, for example:<br>
+<p>Comprehensions should be able to handle most places where you otherwise would use a loop, <code>each</code>/<code>forEach</code>, <code>map</code>, or <code>select</code>/<code>filter</code>, for example:<br>
 <code>shortNames = (name for name in list when name.length &lt; 5)</code><br>
 If you know the start and end of your loop, or would like to step through in fixed-size increments, you can use a range to specify the start and end of your comprehension.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="range_comprehensions">
@@ -1503,7 +1565,7 @@ <h2>Loops and Comprehensions</h2>
 </aside>
 <p>If you would like to iterate over just the keys that are defined on the object itself, by adding a <code>hasOwnProperty</code> check to avoid properties that may be inherited from the prototype, use <code>for own key, value of object</code>.</p>
 <p>To iterate a generator function, use <code>from</code>. See <a href="#generator-iteration">Generator Functions</a>.</p>
-<p>The only low-level loop that CoffeeScript provides is the <strong>while</strong> loop. The main difference from JavaScript is that the <strong>while</strong> loop can be used as an expression, returning an array containing the result of each iteration through the loop.</p>
+<p>The only low-level loop that CoffeeScript provides is the <code>while</code> loop. The main difference from JavaScript is that the <code>while</code> loop can be used as an expression, returning an array containing the result of each iteration through the loop.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="while">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1552,24 +1614,27 @@ <h2>Loops and Comprehensions</h2>
   </div>
   
 </aside>
-<p>For readability, the <strong>until</strong> keyword is equivalent to <code>while not</code>, and the <strong>loop</strong> keyword is equivalent to <code>while true</code>.</p>
+<p>For readability, the <code>until</code> keyword is equivalent to <code>while not</code>, and the <code>loop</code> keyword is equivalent to <code>while true</code>.</p>
 <p>When using a JavaScript loop to generate functions, it’s common to insert a closure wrapper in order to ensure that loop variables are closed over, and all the generated functions don’t just share the final values. CoffeeScript provides the <code>do</code> keyword, which immediately invokes a passed function, forwarding any arguments.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="do">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
       <textarea class="coffeescript-input" id="do-coffee">for filename in list
   do (filename) ->
-    fs.readFile filename, (err, contents) ->
-      compile filename, contents.toString()
+    if filename not in ['.DS_Store', 'Thumbs.db', 'ehthumbs.db']
+      fs.readFile filename, (err, contents) ->
+        compile filename, contents.toString()
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
       <textarea class="javascript-output" id="do-js">var filename, fn, i, len;
 
 fn = function(filename) {
-  return fs.readFile(filename, function(err, contents) {
-    return compile(filename, contents.toString());
-  });
+  if (filename !== '.DS_Store' && filename !== 'Thumbs.db' && filename !== 'ehthumbs.db') {
+    return fs.readFile(filename, function(err, contents) {
+      return compile(filename, contents.toString());
+    });
+  }
 };
 for (i = 0, len = list.length; i < len; i++) {
   filename = list[i];
@@ -1632,11 +1697,12 @@ <h2>Array Slicing and Splicing with Ranges</h2>
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="splices-js">var numbers, ref;
+      <textarea class="javascript-output" id="splices-js">var numbers, ref,
+  splice = [].splice;
 
 numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
 
-[].splice.apply(numbers, [3, 4].concat(ref = [-3, -4, -5, -6])), ref;
+splice.apply(numbers, [3, 4].concat(ref = [-3, -4, -5, -6])), ref;
 </textarea>
     </div>
   </div>
@@ -1751,7 +1817,7 @@ <h2>Everything is an Expression (at least, as much as possible)</h2>
   </div>
   
 </aside>
-<p>As well as silly things, like passing a <strong>try/catch</strong> statement directly into a function call:</p>
+<p>As well as silly things, like passing a <code>try</code>/<code>catch</code> statement directly into a function call:</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="expressions_try">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1793,11 +1859,12 @@ <h2>Operators and Aliases</h2>
 <p>Because the <code>==</code> operator frequently causes undesirable coercion, is intransitive, and has a different meaning than in other languages, CoffeeScript compiles <code>==</code> into <code>===</code>, and <code>!=</code> into <code>!==</code>. In addition, <code>is</code> compiles into <code>===</code>, and <code>isnt</code> into <code>!==</code>.</p>
 <p>You can use <code>not</code> as an alias for <code>!</code>.</p>
 <p>For logic, <code>and</code> compiles to <code>&amp;&amp;</code>, and <code>or</code> into <code>||</code>.</p>
-<p>Instead of a newline or semicolon, <code>then</code> can be used to separate conditions from expressions, in <strong>while</strong>, <strong>if</strong>/<strong>else</strong>, and <strong>switch</strong>/<strong>when</strong> statements.</p>
+<p>Instead of a newline or semicolon, <code>then</code> can be used to separate conditions from expressions, in <code>while</code>, <code>if</code>/<code>else</code>, and <code>switch</code>/<code>when</code> statements.</p>
 <p>As in <a href="http://yaml.org/">YAML</a>, <code>on</code> and <code>yes</code> are the same as boolean <code>true</code>, while <code>off</code> and <code>no</code> are boolean <code>false</code>.</p>
 <p><code>unless</code> can be used as the inverse of <code>if</code>.</p>
 <p>As a shortcut for <code>this.property</code>, you can use <code>@property</code>.</p>
 <p>You can use <code>in</code> to test for array presence, and <code>of</code> to test for JavaScript object-key presence.</p>
+<p>In a <code>for</code> loop, <code>from</code> compiles to the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of">ES2015 <code>of</code></a>. (Yes, it’s unfortunate; the CoffeeScript <code>of</code> predates the ES2015 <code>of</code>.)</p>
 <p>To simplify math expressions, <code>**</code> can be used for exponentiation and <code>//</code> performs integer division. <code>%</code> works just like in JavaScript, while <code>%%</code> provides <a href="https://en.wikipedia.org/wiki/Modulo_operation">“dividend dependent modulo”</a>:</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="modulo">
   <div class="row">
@@ -1863,12 +1930,16 @@ <h2>Operators and Aliases</h2>
 <td><code>this</code></td>
 </tr>
 <tr>
-<td><code>of</code></td>
-<td><code>in</code></td>
+<td><code>a in b</code></td>
+<td><code>[].indexOf.call(b, a) &gt;= 0</code></td>
 </tr>
 <tr>
-<td><code>in</code></td>
-<td><em>no JS equivalent</em></td>
+<td><code>a of b</code></td>
+<td><code>a in b</code></td>
+</tr>
+<tr>
+<td><code>for a from b</code></td>
+<td><code>for (a of b)</code></td>
 </tr>
 <tr>
 <td><code>a ** b</code></td>
@@ -1933,8 +2004,8 @@ <h2>Operators and Aliases</h2>
         </section>
         <section id="existential-operator">
           <h2>The Existential Operator</h2>
-<p>It’s a little difficult to check for the existence of a variable in JavaScript. <code>if (variable) …</code> comes close, but fails for zero, the empty string, and false. CoffeeScript’s existential operator <code>?</code> returns true unless a variable is <strong>null</strong> or <strong>undefined</strong>, which makes it analogous to Ruby’s <code>nil?</code></p>
-<p>It can also be used for safer conditional assignment than <code>||=</code> provides, for cases where you may be handling numbers or strings.</p>
+<p>It’s a little difficult to check for the existence of a variable in JavaScript. <code>if (variable) …</code> comes close, but fails for zero, the empty string, and false (to name just the most common cases). CoffeeScript’s existential operator <code>?</code> returns true unless a variable is <code>null</code> or <code>undefined</code> or undeclared, which makes it analogous to Ruby’s <code>nil?</code>.</p>
+<p>It can also be used for safer conditional assignment than the JavaScript pattern <code>a = a || value</code> provides, for cases where you may be handling numbers or strings.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="existence">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -1971,175 +2042,119 @@ <h2>The Existential Operator</h2>
   </div>
   
 </aside>
-<p>The accessor variant of the existential operator <code>?.</code> can be used to soak up null references in a chain of properties. Use it instead of the dot accessor <code>.</code> in cases where the base value may be <strong>null</strong> or <strong>undefined</strong>. If all of the properties exist then you’ll get the expected result, if the chain is broken, <strong>undefined</strong> is returned instead of the <strong>TypeError</strong> that would be raised otherwise.</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="soaks">
+<p>Note that if the compiler knows that <code>a</code> is in scope and therefore declared, <code>a?</code> compiles to <code>a != null</code>, <em>not</em> <code>a !== null</code>. The <code>!=</code> makes a loose comparison to <code>null</code>, which does double duty also comparing against <code>undefined</code>. The reverse also holds for <code>not a?</code> or <code>unless a?</code>.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="existence_declared">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="soaks-coffee">zip = lottery.drawWinner?().address?.zipcode
+      <textarea class="coffeescript-input" id="existence_declared-coffee">major = 'Computer Science'
+
+unless major?
+  signUpForClass 'Introduction to Wines'
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="soaks-js">var ref, zip;
+      <textarea class="javascript-output" id="existence_declared-js">var major;
 
-zip = typeof lottery.drawWinner === "function" ? (ref = lottery.drawWinner().address) != null ? ref.zipcode : void 0 : void 0;
+major = 'Computer Science';
+
+if (major == null) {
+  signUpForClass('Introduction to Wines');
+}
 </textarea>
     </div>
   </div>
   
 </aside>
-<p>Soaking up nulls is similar to Ruby’s <a href="https://rubygems.org/gems/andand">andand gem</a>, and to the <a href="http://docs.groovy-lang.org/latest/html/documentation/index.html#_safe_navigation_operator">safe navigation operator</a> in Groovy.</p>
-
-        </section>
-        <section id="classes">
-          <h2>Classes</h2>
-<p>CoffeeScript 1 provided the <code>class</code> and <code>extends</code> keywords as syntactic sugar for working with prototypal functions. With ES2015, JavaScript has adopted those keywords; so CoffeeScript 2 compiles its <code>class</code> and <code>extends</code> keywords to ES2015 classes.</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="classes">
+<p>If a variable might be undeclared, the compiler does a thorough check. This is what JavaScript coders <em>should</em> be typing when they want to check if a mystery variable exists.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="existence_undeclared">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="classes-coffee">class Animal
-  constructor: (@name) ->
-
-  move: (meters) ->
-    alert @name + " moved #{meters}m."
-
-class Snake extends Animal
-  move: ->
-    alert "Slithering..."
-    super 5
-
-class Horse extends Animal
-  move: ->
-    alert "Galloping..."
-    super 45
-
-sam = new Snake "Sammy the Python"
-tom = new Horse "Tommy the Palomino"
-
-sam.move()
-tom.move()
+      <textarea class="coffeescript-input" id="existence_undeclared-coffee">if window?
+  environment = 'browser (probably)'
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="classes-js">var Animal, Horse, Snake, sam, tom;
-
-Animal = class Animal {
-  constructor(name) {
-    this.name = name;
-  }
-
-  move(meters) {
-    return alert(this.name + ` moved ${meters}m.`);
-  }
-
-};
-
-Snake = class Snake extends Animal {
-  move() {
-    alert("Slithering...");
-    return super.move(5);
-  }
-
-};
-
-Horse = class Horse extends Animal {
-  move() {
-    alert("Galloping...");
-    return super.move(45);
-  }
-
-};
-
-sam = new Snake("Sammy the Python");
-
-tom = new Horse("Tommy the Palomino");
+      <textarea class="javascript-output" id="existence_undeclared-js">var environment;
 
-sam.move();
-
-tom.move();
+if (typeof window !== "undefined" && window !== null) {
+  environment = 'browser (probably)';
+}
 </textarea>
     </div>
   </div>
   
-  <div class="row">
-    <div class="col-xs-12 text-xs-right">
-      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="classes" data-run="true">▶</button>
-    </div>
-  </div>
-  
 </aside>
-<p>Static methods can be defined using <code>@</code> before the method name:</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="static">
+<p>The accessor variant of the existential operator <code>?.</code> can be used to soak up null references in a chain of properties. Use it instead of the dot accessor <code>.</code> in cases where the base value may be <code>null</code> or <code>undefined</code>. If all of the properties exist then you’ll get the expected result, if the chain is broken, <code>undefined</code> is returned instead of the <code>TypeError</code> that would be raised otherwise.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="soaks">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="static-coffee">class Teenager
-	@say: (speech) ->
-		words = speech.split ' '
-		fillers = ['uh', 'um', 'like', 'actually', 'so', 'maybe']
-		output = []
-		for word, index in words
-			output.push word
-			output.push fillers[Math.floor(Math.random() * fillers.length)] unless index is words.length - 1
-		output.join ', '
+      <textarea class="coffeescript-input" id="soaks-coffee">zip = lottery.drawWinner?().address?.zipcode
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="static-js">var Teenager;
-
-Teenager = class Teenager {
-  static say(speech) {
-    var fillers, i, index, len, output, word, words;
-    words = speech.split(' ');
-    fillers = ['uh', 'um', 'like', 'actually', 'so', 'maybe'];
-    output = [];
-    for (index = i = 0, len = words.length; i < len; index = ++i) {
-      word = words[index];
-      output.push(word);
-      if (index !== words.length - 1) {
-        output.push(fillers[Math.floor(Math.random() * fillers.length)]);
-      }
-    }
-    return output.join(', ');
-  }
+      <textarea class="javascript-output" id="soaks-js">var ref, zip;
 
-};
+zip = typeof lottery.drawWinner === "function" ? (ref = lottery.drawWinner().address) != null ? ref.zipcode : void 0 : void 0;
 </textarea>
     </div>
   </div>
   
-  <div class="row">
-    <div class="col-xs-12 text-xs-right">
-      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="static" data-run="Teenager.say%28%22Are%20we%20there%20yet%3F%22%29"><small>▶</small>&ensp;Teenager.say(&quot;Are we there yet?&quot;)</button>
-    </div>
-  </div>
-  
 </aside>
-<p>Finally, class definitions are blocks of executable code, which make for interesting metaprogramming possibilities. In the context of a class definition, <code>this</code> is the class object itself; therefore, you can assign static properties by using <code>@property: value</code>.</p>
+<p>For completeness:</p>
+<table>
+<thead>
+<tr>
+<th>Example</th>
+<th>Definition</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td><code>a?</code></td>
+<td>tests that <code>a</code> is in scope and <code>a != null</code></td>
+</tr>
+<tr>
+<td><code>a ? b</code></td>
+<td>returns <code>a</code> if <code>a</code> is in scope and <code>a != null</code>; otherwise, <code>b</code></td>
+</tr>
+<tr>
+<td><code>a?.b</code> or <code>a?['b']</code></td>
+<td>returns <code>a.b</code> if <code>a</code> is in scope and <code>a != null</code>; otherwise, <code>undefined</code></td>
+</tr>
+<tr>
+<td><code>a?(b, c)</code> or <code>a? b, c</code> </td>
+<td>returns the result of calling <code>a</code> (with arguments <code>b</code> and <code>c</code>) if <code>a</code> is in scope and callable; otherwise, <code>undefined</code></td>
+</tr>
+<tr>
+<td><code>a ?= b</code></td>
+<td>assigns the value of <code>b</code> to <code>a</code> if <code>a</code> is not in scope or if <code>a == null</code>; produces the new value of <code>a</code></td>
+</tr>
+</tbody>
+</table>
 
         </section>
-        <section id="prototypal-inheritance">
-          <h2>Prototypal Inheritance</h2>
-<p>In addition to supporting ES2015 classes, CoffeeScript provides a few shortcuts for working with prototypes. The <code>extends</code> operator can be used to create an inheritance chain between any pair of constructor functions, and <code>::</code> gives you quick access to an object’s prototype:</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="prototypes">
+        <section id="chaining">
+          <h2>Chaining Function Calls</h2>
+<p>Leading <code>.</code> closes all open calls, allowing for simpler chaining syntax.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="chaining">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="prototypes-coffee">String::dasherize = ->
-  this.replace /_/g, "-"
+      <textarea class="coffeescript-input" id="chaining-coffee">$ 'body'
+.click (e) ->
+  $ '.box'
+  .fadeIn 'fast'
+  .addClass '.active'
+.css 'background', 'white'
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="prototypes-js">String.prototype.dasherize = function() {
-  return this.replace(/_/g, "-");
-};
+      <textarea class="javascript-output" id="chaining-js">$('body').click(function(e) {
+  return $('.box').fadeIn('fast').addClass('.active');
+}).css('background', 'white');
 </textarea>
     </div>
   </div>
   
-  <div class="row">
-    <div class="col-xs-12 text-xs-right">
-      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="prototypes" data-run="%22one_two%22.dasherize%28%29"><small>▶</small>&ensp;&quot;one_two&quot;.dasherize()</button>
-    </div>
-  </div>
-  
 </aside>
 
         </section>
@@ -2344,11 +2359,11 @@ <h2>Destructuring Assignment</h2>
   </div>
   
 </aside>
-<p>The above example also demonstrates that if properties are missing in the destructured object or array, you can, just like in JavaScript, provide defaults. The difference with JavaScript is that CoffeeScript, as always, treats both null and undefined the same.</p>
+<p>The above example also demonstrates that if properties are missing in the destructured object or array, you can, just like in JavaScript, provide defaults. Note though that unlike with the existential operator, the default is only applied with the value is missing or <code>undefined</code>—<a href="#breaking-changes-default-values">passing <code>null</code> will set a value of <code>null</code></a>, not the default.</p>
 
         </section>
         <section id="fat-arrow">
-          <h2>Function Modifiers</h2>
+          <h2>Bound (Fat Arrow) Functions</h2>
 <p>In JavaScript, the <code>this</code> keyword is dynamically scoped to mean the object that the current function is attached to. If you pass a function as a callback or attach it to a different object, the original value of <code>this</code> will be lost. If you’re not familiar with this behavior, <a href="http://64.13.255.16/articles/scope_in_javascript/">this Digital Web article</a> gives a good overview of the quirks.</p>
 <p>The fat arrow <code>=&gt;</code> can be used to both define a function, and to bind it to the current value of <code>this</code>, right on the spot. This is helpful when using callback-based libraries like Prototype or jQuery, for creating iterator functions to pass to <code>each</code>, or event-handler functions to use with <code>on</code>. Functions created with the fat arrow are able to access properties of the <code>this</code> where they’re defined.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="fat_arrow">
@@ -2378,10 +2393,12 @@ <h2>Function Modifiers</h2>
   
 </aside>
 <p>If we had used <code>-&gt;</code> in the callback above, <code>@customer</code> would have referred to the undefined “customer” property of the DOM element, and trying to call <code>purchase()</code> on it would have raised an exception.</p>
-<p>When used in a class definition, methods declared with the fat arrow will be automatically bound to each instance of the class when the instance is constructed.</p>
-<div id="generator-functions" class="bookmark"></div>
-<div id="async-functions" class="bookmark"></div>
-<p>CoffeeScript also supports <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">generator functions</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function">async functions</a> through the <code>yield</code> and <code>await</code> keywords respectively. There’s no <code>function*(){}</code> or <code>async function(){}</code> nonsense — a generator in CoffeeScript is simply a function that yields, and an async function in CoffeeScript is simply a function that awaits.</p>
+<p>The fat arrow was one of the most popular features of CoffeeScript, and ES2015 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions">adopted it</a>; so CoffeeScript 2 compiles <code>=&gt;</code> to ES <code>=&gt;</code>.</p>
+
+        </section>
+        <section id="generators">
+          <h2>Generator Functions</h2>
+<p>CoffeeScript supports ES2015 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">generator functions</a> through the <code>yield</code> keyword. There’s no <code>function*(){}</code> nonsense — a generator in CoffeeScript is simply a function that yields.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="generators">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -2475,6 +2492,11 @@ <h2>Function Modifiers</h2>
   </div>
   
 </aside>
+
+        </section>
+        <section id="async-functions">
+          <h2>Async Functions</h2>
+<p>ES2017’s <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function">async functions</a> are supported through the <code>await</code> keyword. Like with generators, there’s no need for an <code>async</code> keyword; an async function in CoffeeScript is simply a function that awaits.</p>
 <p>Similar to how <code>yield return</code> forces a generator, <code>await return</code> may be used to force a function to be async.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="async">
   <div class="row">
@@ -2536,38 +2558,191 @@ <h2>Function Modifiers</h2>
 </aside>
 
         </section>
-        <section id="switch">
-          <h2>Switch/When/Else</h2>
-<p><strong>Switch</strong> statements in JavaScript are a bit awkward. You need to remember to <strong>break</strong> at the end of every <strong>case</strong> statement to avoid accidentally falling through to the default case. CoffeeScript prevents accidental fall-through, and can convert the <code>switch</code> into a returnable, assignable expression. The format is: <code>switch</code> condition, <code>when</code> clauses, <code>else</code> the default case.</p>
-<p>As in Ruby, <strong>switch</strong> statements in CoffeeScript can take multiple values for each <strong>when</strong> clause. If any of the values match, the clause runs.</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="switch">
+        <section id="classes">
+          <h2>Classes</h2>
+<p>CoffeeScript 1 provided the <code>class</code> and <code>extends</code> keywords as syntactic sugar for working with prototypal functions. With ES2015, JavaScript has adopted those keywords; so CoffeeScript 2 compiles its <code>class</code> and <code>extends</code> keywords to ES2015 classes.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="classes">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="switch-coffee">switch day
-  when "Mon" then go work
-  when "Tue" then go relax
-  when "Thu" then go iceFishing
-  when "Fri", "Sat"
-    if day is bingoDay
-      go bingo
-      go dancing
-  when "Sun" then go church
-  else go work
-</textarea>
-    </div>
-    <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="switch-js">switch (day) {
-  case "Mon":
-    go(work);
-    break;
-  case "Tue":
-    go(relax);
-    break;
-  case "Thu":
-    go(iceFishing);
-    break;
-  case "Fri":
-  case "Sat":
+      <textarea class="coffeescript-input" id="classes-coffee">class Animal
+  constructor: (@name) ->
+
+  move: (meters) ->
+    alert @name + " moved #{meters}m."
+
+class Snake extends Animal
+  move: ->
+    alert "Slithering..."
+    super 5
+
+class Horse extends Animal
+  move: ->
+    alert "Galloping..."
+    super 45
+
+sam = new Snake "Sammy the Python"
+tom = new Horse "Tommy the Palomino"
+
+sam.move()
+tom.move()
+</textarea>
+    </div>
+    <div class="col-md-6 javascript-output-column">
+      <textarea class="javascript-output" id="classes-js">var Animal, Horse, Snake, sam, tom;
+
+Animal = class Animal {
+  constructor(name) {
+    this.name = name;
+  }
+
+  move(meters) {
+    return alert(this.name + ` moved ${meters}m.`);
+  }
+
+};
+
+Snake = class Snake extends Animal {
+  move() {
+    alert("Slithering...");
+    return super.move(5);
+  }
+
+};
+
+Horse = class Horse extends Animal {
+  move() {
+    alert("Galloping...");
+    return super.move(45);
+  }
+
+};
+
+sam = new Snake("Sammy the Python");
+
+tom = new Horse("Tommy the Palomino");
+
+sam.move();
+
+tom.move();
+</textarea>
+    </div>
+  </div>
+  
+  <div class="row">
+    <div class="col-xs-12 text-xs-right">
+      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="classes" data-run="true">▶</button>
+    </div>
+  </div>
+  
+</aside>
+<p>Static methods can be defined using <code>@</code> before the method name:</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="static">
+  <div class="row">
+    <div class="col-md-6 coffeescript-input-column">
+      <textarea class="coffeescript-input" id="static-coffee">class Teenager
+	@say: (speech) ->
+		words = speech.split ' '
+		fillers = ['uh', 'um', 'like', 'actually', 'so', 'maybe']
+		output = []
+		for word, index in words
+			output.push word
+			output.push fillers[Math.floor(Math.random() * fillers.length)] unless index is words.length - 1
+		output.join ', '
+</textarea>
+    </div>
+    <div class="col-md-6 javascript-output-column">
+      <textarea class="javascript-output" id="static-js">var Teenager;
+
+Teenager = class Teenager {
+  static say(speech) {
+    var fillers, i, index, len, output, word, words;
+    words = speech.split(' ');
+    fillers = ['uh', 'um', 'like', 'actually', 'so', 'maybe'];
+    output = [];
+    for (index = i = 0, len = words.length; i < len; index = ++i) {
+      word = words[index];
+      output.push(word);
+      if (index !== words.length - 1) {
+        output.push(fillers[Math.floor(Math.random() * fillers.length)]);
+      }
+    }
+    return output.join(', ');
+  }
+
+};
+</textarea>
+    </div>
+  </div>
+  
+  <div class="row">
+    <div class="col-xs-12 text-xs-right">
+      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="static" data-run="Teenager.say%28%22Are%20we%20there%20yet%3F%22%29"><small>▶</small>&ensp;Teenager.say(&quot;Are we there yet?&quot;)</button>
+    </div>
+  </div>
+  
+</aside>
+<p>Finally, class definitions are blocks of executable code, which make for interesting metaprogramming possibilities. In the context of a class definition, <code>this</code> is the class object itself; therefore, you can assign static properties by using <code>@property: value</code>.</p>
+
+        </section>
+        <section id="prototypal-inheritance">
+          <h2>Prototypal Inheritance</h2>
+<p>In addition to supporting ES2015 classes, CoffeeScript provides a shortcut for working with prototypes. The <code>::</code> operator gives you quick access to an object’s prototype:</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="prototypes">
+  <div class="row">
+    <div class="col-md-6 coffeescript-input-column">
+      <textarea class="coffeescript-input" id="prototypes-coffee">String::dasherize = ->
+  this.replace /_/g, "-"
+</textarea>
+    </div>
+    <div class="col-md-6 javascript-output-column">
+      <textarea class="javascript-output" id="prototypes-js">String.prototype.dasherize = function() {
+  return this.replace(/_/g, "-");
+};
+</textarea>
+    </div>
+  </div>
+  
+  <div class="row">
+    <div class="col-xs-12 text-xs-right">
+      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="prototypes" data-run="%22one_two%22.dasherize%28%29"><small>▶</small>&ensp;&quot;one_two&quot;.dasherize()</button>
+    </div>
+  </div>
+  
+</aside>
+
+        </section>
+        <section id="switch">
+          <h2>Switch/When/Else</h2>
+<p><code>switch</code> statements in JavaScript are a bit awkward. You need to remember to <code>break</code> at the end of every <code>case</code> statement to avoid accidentally falling through to the default case. CoffeeScript prevents accidental fall-through, and can convert the <code>switch</code> into a returnable, assignable expression. The format is: <code>switch</code> condition, <code>when</code> clauses, <code>else</code> the default case.</p>
+<p>As in Ruby, <code>switch</code> statements in CoffeeScript can take multiple values for each <code>when</code> clause. If any of the values match, the clause runs.</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="switch">
+  <div class="row">
+    <div class="col-md-6 coffeescript-input-column">
+      <textarea class="coffeescript-input" id="switch-coffee">switch day
+  when "Mon" then go work
+  when "Tue" then go relax
+  when "Thu" then go iceFishing
+  when "Fri", "Sat"
+    if day is bingoDay
+      go bingo
+      go dancing
+  when "Sun" then go church
+  else go work
+</textarea>
+    </div>
+    <div class="col-md-6 javascript-output-column">
+      <textarea class="javascript-output" id="switch-js">switch (day) {
+  case "Mon":
+    go(work);
+    break;
+  case "Tue":
+    go(relax);
+    break;
+  case "Thu":
+    go(iceFishing);
+    break;
+  case "Fri":
+  case "Sat":
     if (day === bingoDay) {
       go(bingo);
       go(dancing);
@@ -2584,7 +2759,7 @@ <h2>Switch/When/Else</h2>
   </div>
   
 </aside>
-<p>Switch statements can also be used without a control expression, turning them in to a cleaner alternative to if/else chains.</p>
+<p><code>switch</code> statements can also be used without a control expression, turning them in to a cleaner alternative to <code>if</code>/<code>else</code> chains.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="switch_with_no_expression">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -2626,7 +2801,7 @@ <h2>Switch/When/Else</h2>
         </section>
         <section id="try">
           <h2>Try/Catch/Finally</h2>
-<p>Try-expressions have the same semantics as try-statements in JavaScript, though in CoffeeScript, you may omit <em>both</em> the catch and finally parts. The catch part may also omit the error parameter if it is not needed.</p>
+<p><code>try</code> expressions have the same semantics as <code>try</code> statements in JavaScript, though in CoffeeScript, you may omit <em>both</em> the catch and finally parts. The catch part may also omit the error parameter if it is not needed.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="try">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
@@ -2946,67 +3121,6 @@ <h2>Embedded JavaScript</h2>
 
         </section>
       </section>
-      <section id="unsupported">
-        <h2>Unsupported ECMAScript Features</h2>
-<p>There are a few ECMAScript features that CoffeeScript intentionally doesn’t support.</p>
-<section id="unsupported-let-const">
-<h3><code>let</code> and <code>const</code>: Block-Scoped and Reassignment-Protected Variables</h3>
-<p>When CoffeeScript was designed, <code>var</code> was <a href="https://github.com/jashkenas/coffeescript/issues/238#issuecomment-153502">intentionally omitted</a>. This was to spare developers the mental housekeeping of needing to worry about variable <em>declaration</em> (<code>var foo</code>) as opposed to variable <em>assignment</em> (<code>foo = 1</code>). The CoffeeScript compiler automatically takes care of declaration for you, by generating <code>var</code> statements at the top of every function scope. This makes it impossible to accidentally declare a global variable.</p>
-<p><code>let</code> and <code>const</code> add a useful ability to JavaScript in that you can use them to declare variables within a <em>block</em> scope, for example within an <code>if</code> statement body or a <code>for</code> loop body, whereas <code>var</code> always declares variables in the scope of an entire function. When CoffeeScript 2 was designed, there was much discussion of whether this functionality was useful enough to outweigh the simplicity offered by never needing to consider variable declaration in CoffeeScript. In the end, it was decided that the simplicity was more valued. In CoffeeScript there remains only one type of variable.</p>
-<p>Keep in mind that <code>const</code> only protects you from <em>reassigning</em> a variable; it doesn’t prevent the variable’s value from changing, the way constants usually do in other languages:</p>
-<blockquote class="uneditable-code-block"><pre><code class="language-js"><span class="keyword">const</span> obj = {<span class="attr">foo</span>: <span class="string">'bar'</span>};
-obj.foo = <span class="string">'baz'</span>; <span class="comment">// Allowed!</span>
-obj = {}; <span class="comment">// Throws error</span>
-</code></pre>
-</blockquote></section>
-<section id="unsupported-get-set">
-<h3><code>get</code> and <code>set</code> Keyword Shorthand Syntax</h3>
-<p><code>get</code> and <code>set</code>, as keywords preceding functions or class methods, are intentionally unimplemented in CoffeeScript.</p>
-<p>This is to avoid grammatical ambiguity, since in CoffeeScript such a construct looks identical to a function call (e.g. <code>get(function foo() {})</code>); and because there is an <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty">alternate syntax</a> that is slightly more verbose but just as effective:</p>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="get_set">
-  <div class="row">
-    <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="get_set-coffee">screen =
-  width: 1200
-  ratio: 16/9
-
-Object.defineProperty screen, 'height',
-  get: ->
-    this.width / this.ratio
-  set: (val) ->
-    this.width = val / this.ratio
-</textarea>
-    </div>
-    <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="get_set-js">var screen;
-
-screen = {
-  width: 1200,
-  ratio: 16 / 9
-};
-
-Object.defineProperty(screen, 'height', {
-  get: function() {
-    return this.width / this.ratio;
-  },
-  set: function(val) {
-    return this.width = val / this.ratio;
-  }
-});
-</textarea>
-    </div>
-  </div>
-  
-  <div class="row">
-    <div class="col-xs-12 text-xs-right">
-      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="get_set" data-run="screen.height"><small>▶</small>&ensp;screen.height</button>
-    </div>
-  </div>
-  
-</aside>
-</section>
-
-      </section>
       <section id="literate">
         <h2>Literate CoffeeScript</h2>
 <p>Besides being used as an ordinary programming language, CoffeeScript may also be written in “literate” mode. If you name your file with a <code>.litcoffee</code> extension, you can write it as a Markdown document — a document that also happens to be executable CoffeeScript code. The compiler will treat any indented blocks (Markdown’s way of indicating source code) as executable code, and ignore the rest as comments. Code blocks must also be separated from comments by at least one blank line.</p>
@@ -3168,11 +3282,81 @@ <h2>Contributing</h2>
 
         </section>
       </section>
+      <section id="unsupported">
+        <h2>Unsupported ECMAScript Features</h2>
+<p>There are a few ECMAScript features that CoffeeScript intentionally doesn’t support.</p>
+
+        <section id="unsupported-let-const">
+          <h3><code>let</code> and <code>const</code>: block-scoped and reassignment-protected variables</h3>
+<p>When CoffeeScript was designed, <code>var</code> was <a href="https://github.com/jashkenas/coffeescript/issues/238#issuecomment-153502">intentionally omitted</a>. This was to spare developers the mental housekeeping of needing to worry about variable <em>declaration</em> (<code>var foo</code>) as opposed to variable <em>assignment</em> (<code>foo = 1</code>). The CoffeeScript compiler automatically takes care of declaration for you, by generating <code>var</code> statements at the top of every function scope. This makes it impossible to accidentally declare a global variable.</p>
+<p><code>let</code> and <code>const</code> add a useful ability to JavaScript in that you can use them to declare variables within a <em>block</em> scope, for example within an <code>if</code> statement body or a <code>for</code> loop body, whereas <code>var</code> always declares variables in the scope of an entire function. When CoffeeScript 2 was designed, there was much discussion of whether this functionality was useful enough to outweigh the simplicity offered by never needing to consider variable declaration in CoffeeScript. In the end, it was decided that the simplicity was more valued. In CoffeeScript there remains only one type of variable.</p>
+<p>Keep in mind that <code>const</code> only protects you from <em>reassigning</em> a variable; it doesn’t prevent the variable’s value from changing, the way constants usually do in other languages:</p>
+<blockquote class="uneditable-code-block"><pre><code class="language-js"><span class="keyword">const</span> obj = {<span class="attr">foo</span>: <span class="string">'bar'</span>};
+obj.foo = <span class="string">'baz'</span>; <span class="comment">// Allowed!</span>
+obj = {}; <span class="comment">// Throws error</span>
+</code></pre>
+</blockquote>
+        </section>
+        <section id="unsupported-named-functions">
+          <h3>Named functions and function declarations</h3>
+<p>Newcomers to CoffeeScript often wonder how to generate the JavaScript <code>function foo() {}</code>, as opposed to the <code>foo = function() {}</code> that CoffeeScript produces. The first form is a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function">function declaration</a>, and the second is a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function">function expression</a>. As stated above, in CoffeeScript <a href="#expressions">everything is an expression</a>, so naturally we favor the expression form. Supporting only one variant helps avoid confusing bugs that can arise from the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function#Function_declaration_hoisting">subtle differences between the two forms</a>.</p>
+<p>Technically, <code>foo = function() {}</code> is creating an anonymous function that gets assigned to a variable named <code>foo</code>. Some very early versions of CoffeeScript named this function, e.g. <code>foo = function foo() {}</code>, but this was dropped because of compatibility issues with Internet Explorer. For a while this annoyed people, as these functions would be unnamed in stack traces; but modern JavaScript runtimes <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name">infer the names of such anonymous functions</a> from the names of the variables to which they’re assigned. Given that this is the case, and given that not all functions in function expressions can be named (for example, the functions in <code>first.fn = -&gt;; second.fn = -&gt;</code> can’t both be named <code>fn</code>) it’s simplest to just preserve the current behavior.</p>
+
+        </section>
+        <section id="unsupported-get-set">
+          <h3><code>get</code> and <code>set</code> keyword shorthand syntax</h3>
+<p><code>get</code> and <code>set</code>, as keywords preceding functions or class methods, are intentionally unimplemented in CoffeeScript.</p>
+<p>This is to avoid grammatical ambiguity, since in CoffeeScript such a construct looks identical to a function call (e.g. <code>get(function foo() {})</code>); and because there is an <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty">alternate syntax</a> that is slightly more verbose but just as effective:</p>
+<aside class="code-example container-fluid bg-ribbed-dark" data-example="get_set">
+  <div class="row">
+    <div class="col-md-6 coffeescript-input-column">
+      <textarea class="coffeescript-input" id="get_set-coffee">screen =
+  width: 1200
+  ratio: 16/9
+
+Object.defineProperty screen, 'height',
+  get: ->
+    this.width / this.ratio
+  set: (val) ->
+    this.width = val / this.ratio
+</textarea>
+    </div>
+    <div class="col-md-6 javascript-output-column">
+      <textarea class="javascript-output" id="get_set-js">var screen;
+
+screen = {
+  width: 1200,
+  ratio: 16 / 9
+};
+
+Object.defineProperty(screen, 'height', {
+  get: function() {
+    return this.width / this.ratio;
+  },
+  set: function(val) {
+    return this.width = val / this.ratio;
+  }
+});
+</textarea>
+    </div>
+  </div>
+  
+  <div class="row">
+    <div class="col-xs-12 text-xs-right">
+      <button type="button" class="btn btn-primary" data-action="run-code-example" data-example="get_set" data-run="screen.height"><small>▶</small>&ensp;screen.height</button>
+    </div>
+  </div>
+  
+</aside>
+
+        </section>
+      </section>
       <section id="breaking-changes">
         <h2>Breaking Changes From CoffeeScript 1.x to 2</h2>
 <p>CoffeeScript 2 aims to output as much idiomatic ES2015+ syntax as possible with as few breaking changes from CoffeeScript 1.x as possible. Some breaking changes, unfortunately, were unavoidable.</p>
-<section id="breaking-changes-default-values">
-<h3>Default values for function parameters and destructured elements</h3>
+
+        <section id="breaking-changes-default-values">
+          <h3>Default values for function parameters and destructured elements</h3>
 <p>Per the <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters">ES2015 spec regarding function default parameters</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Default_values">destructuring default values</a>, default values are only applied when a value is missing or <code>undefined</code>. In CoffeeScript 1.x, the default value would be applied in those cases but also if the  value was <code>null</code>.</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="breaking_change_function_parameter_default_values">
   <div class="row">
@@ -3228,9 +3412,10 @@ <h3>Default values for function parameters and destructured elements</h3>
   </div>
   
 </aside>
-</section>
-<section id="breaking-changes-bound-generator-functions">
-<h3>Bound generator functions</h3>
+
+        </section>
+        <section id="breaking-changes-bound-generator-functions">
+          <h3>Bound generator functions</h3>
 <p>Bound generator functions, a.k.a. generator arrow functions, <a href="http://stackoverflow.com/questions/27661306/can-i-use-es6s-arrow-function-syntax-with-generators-arrow-notation">aren’t allowed in ECMAScript</a>. You can write <code>function*</code> or <code>=&gt;</code>, but not both. Therefore, CoffeeScript code like this:</p>
 <blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="function"><span class="title">f</span> = =&gt;</span> <span class="keyword">yield</span> <span class="keyword">this</span>
 <span class="comment"># Throws a compiler error</span>
@@ -3256,9 +3441,10 @@ <h3>Bound generator functions</h3>
   </div>
   
 </aside>
-</section>
-<section id="breaking-changes-classes">
-<h3>Classes are compiled to ES2015 classes</h3>
+
+        </section>
+        <section id="breaking-changes-classes">
+          <h3>Classes are compiled to ES2015 classes</h3>
 <p>ES2015 classes and their methods have some restrictions beyond those on regular functions.</p>
 <p>Class constructors can’t be invoked without <code>new</code>:</p>
 <blockquote class="uneditable-code-block"><pre><code class="language-coffee">(<span class="class"><span class="keyword">class</span>)()</span>
@@ -3275,10 +3461,17 @@ <h3>Classes are compiled to ES2015 classes</h3>
 <span class="keyword">new</span> Namespace.Klass
 <span class="comment"># Throws a TypeError at runtime</span>
 </code></pre>
-</blockquote></section>
-<section id="breaking-changes-bare-super">
-<h3>Bare <code>super</code></h3>
-<p>Due to a syntax clash with <code>super</code> with accessors, bare <code>super</code> no longer compiles to a super call forwarding all arguments.</p>
+</blockquote><p>Due to the hoisting required to compile to ES2015 classes, dynamic keys in class methods can’t use values from the executable class body unless the methods are assigned in prototype style.</p>
+<blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="class"><span class="keyword">class</span> <span class="title">A</span></span>
+  name = <span class="string">'method'</span>
+  <span class="string">"<span class="subst">#{name}</span>"</span>: <span class="function">-&gt;</span>   <span class="comment"># This method will be named 'undefined'</span>
+  @::[name] = <span class="function">-&gt;</span>  <span class="comment"># This will work; assigns to `A.prototype.method`</span>
+</code></pre>
+</blockquote>
+        </section>
+        <section id="breaking-changes-super-extends">
+          <h3><code>super</code> and <code>extends</code></h3>
+<p>Due to a syntax clash with <code>super</code> with accessors, “bare” <code>super</code> (the keyword <code>super</code> without parentheses) no longer compiles to a super call forwarding all arguments.</p>
 <blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="class"><span class="keyword">class</span> <span class="title">B</span> <span class="keyword">extends</span> <span class="title">A</span></span>
   foo: <span class="function">-&gt;</span> <span class="keyword">super</span>
   <span class="comment"># Throws a compiler error</span>
@@ -3327,30 +3520,56 @@ <h3>Bare <code>super</code></h3>
   </div>
   
 </aside>
-</section>
-<section id="breaking-changes-super-in-non-class-methods">
-<h3><code>super</code> in non-class methods</h3>
-<p>In CoffeeScript 1.x it is possible to use <code>super</code> in more than just class methods, such as in manually prototype-assigned functions:</p>
+<p>CoffeeScript 1.x allowed the <code>extends</code> keyword to set up prototypal inheritance between functions, and <code>super</code> could be used manually prototype-assigned functions:</p>
 <blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="function"><span class="title">A</span> = -&gt;</span>
 <span class="function"><span class="title">B</span> = -&gt;</span>
 B extends A
 B.prototype.foo = <span class="function">-&gt;</span> <span class="keyword">super</span> arguments...
-<span class="comment"># Throws a compiler error</span>
+<span class="comment"># Last two lines each throw compiler errors in CoffeeScript 2</span>
 </code></pre>
-</blockquote><p>Due to the switch to ES2015 <code>super</code>, this is no longer supported. The above case could be refactored to:</p>
+</blockquote><p>Due to the switch to ES2015 <code>extends</code> and <code>super</code>, using these keywords for prototypal functions are no longer supported. The above case could be refactored to:</p>
 <aside class="code-example container-fluid bg-ribbed-dark" data-example="breaking_change_super_in_non-class_methods_refactor_with_apply">
   <div class="row">
     <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="breaking_change_super_in_non-class_methods_refactor_with_apply-coffee">A = ->
+      <textarea class="coffeescript-input" id="breaking_change_super_in_non-class_methods_refactor_with_apply-coffee"># Helper functions
+hasProp = {}.hasOwnProperty
+extend = (child, parent) ->
+  ctor = ->
+    @constructor = child
+    return
+  for key of parent
+    if hasProp.call(parent, key)
+      child[key] = parent[key]
+  ctor.prototype = parent.prototype
+  child.prototype = new ctor
+  child
+
+
+A = ->
 B = ->
-B extends A
+extend B, A
 B.prototype.foo = -> A::foo.apply this, arguments
 </textarea>
     </div>
     <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="breaking_change_super_in_non-class_methods_refactor_with_apply-js">var A, B,
-  extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); return child; },
-  hasProp = {}.hasOwnProperty;
+      <textarea class="javascript-output" id="breaking_change_super_in_non-class_methods_refactor_with_apply-js">var A, B, extend, hasProp;
+
+hasProp = {}.hasOwnProperty;
+
+extend = function(child, parent) {
+  var ctor, key;
+  ctor = function() {
+    this.constructor = child;
+  };
+  for (key in parent) {
+    if (hasProp.call(parent, key)) {
+      child[key] = parent[key];
+    }
+  }
+  ctor.prototype = parent.prototype;
+  child.prototype = new ctor;
+  return child;
+};
 
 A = function() {};
 
@@ -3391,21 +3610,15 @@ <h3><code>super</code> in non-class methods</h3>
   </div>
   
 </aside>
-</section>
-<section id="breaking-changes-dynamic-class-keys-exclude-executable-class-scope">
-<h3>Dynamic class keys exclude executable class scope</h3>
-<p>Due to the hoisting required to compile to ES2015 classes, dynamic keys in class methods can’t use values from the executable class body unless the methods are assigned in prototype style.</p>
-<blockquote class="uneditable-code-block"><pre><code class="language-coffee"><span class="class"><span class="keyword">class</span> <span class="title">A</span></span>
-  name = <span class="string">'method'</span>
-  <span class="string">"<span class="subst">#{name}</span>"</span>: <span class="function">-&gt;</span>   <span class="comment"># This method will be named 'undefined'</span>
-  @::[name] = <span class="function">-&gt;</span>  <span class="comment"># This will work; assigns to `A.prototype.method`</span>
-</code></pre>
-</blockquote></section>
-<section id="breaking-changes-literate-coffeescript">
-<h3>Literate CoffeeScript now parsed by a Markdown library</h3>
-<p>The CoffeeScript 1.x implementation of Literate CoffeeScript relies on indentation to tell apart code blocks from documentation, and as such it can get confused by Markdown features that also use indentation like lists. In CoffeeScript 2 this has been refactored to now use <a href="https://github.com/markdown-it/markdown-it">Markdown-It</a> to detect Markdown sections rather than just looking at indentation. The only significant difference is that now if you want to include a code block in documentation, as opposed to the compiler recognizing that code block as code, it must have at least one line fully unindented. Wrapping it in HTML tags is no longer sufficient.</p>
-<p>Code blocks interspersed with lists may need to be refactored. In general, code blocks should be separated by a blank line between documentation, and should maintain a consistent indentation level—so an indentation of one tab (or whatever you consider to be a tab stop, like 2 spaces or 4 spaces) should be treated as your code’s “left margin,” with all code in the file relative to that column.</p>
 
+        </section>
+        <section id="breaking-changes-literate-coffeescript">
+          <h3>Literate CoffeeScript parsing</h3>
+<p>CoffeeScript 2’s parsing of Literate CoffeeScript has been refactored to now be more careful about not treating indented lists as code blocks; but this means that all code blocks (unless they are to be interpreted as comments) must be separated by at least one blank line from lists.</p>
+<p>Code blocks should also now maintain a consistent indentation level—so an indentation of one tab (or whatever you consider to be a tab stop, like 2 spaces or 4 spaces) should be treated as your code’s “left margin,” with all code in the file relative to that column.</p>
+<p>Code blocks that you want to be part of the commentary, and not executed, must have at least one line (ideally the first line of the block) completely unindented.</p>
+
+        </section>
       </section>
       <section id="changelog">
         <h2>Change Log</h2>
@@ -3663,28 +3876,6 @@ <h2 class="header">
 <li>When requiring CoffeeScript files in Node you must now explicitly register the compiler. This can be done with <code>require 'coffeescript/register'</code> or <code>CoffeeScript.register()</code>. Also for configuration such as Mocha’s, use <strong>coffeescript/register</strong>.</li>
 <li>Improved error messages, source maps and stack traces. Source maps now use the updated <code>//#</code> syntax.</li>
 <li>Leading <code>.</code> now closes all open calls, allowing for simpler chaining syntax.</li>
-</ul>
-<aside class="code-example container-fluid bg-ribbed-dark" data-example="chaining">
-  <div class="row">
-    <div class="col-md-6 coffeescript-input-column">
-      <textarea class="coffeescript-input" id="chaining-coffee">$ 'body'
-.click (e) ->
-  $ '.box'
-  .fadeIn 'fast'
-  .addClass '.active'
-.css 'background', 'white'
-</textarea>
-    </div>
-    <div class="col-md-6 javascript-output-column">
-      <textarea class="javascript-output" id="chaining-js">$('body').click(function(e) {
-  return $('.box').fadeIn('fast').addClass('.active');
-}).css('background', 'white');
-</textarea>
-    </div>
-  </div>
-  
-</aside>
-<ul>
 <li>Added <code>**</code>, <code>//</code> and <code>%%</code> operators and <code>...</code> expansion in parameter lists and destructuring expressions.</li>
 <li>Multiline strings are now joined by a single space and ignore all indentation. A backslash at the end of a line can denote the amount of whitespace between lines, in both strings and heredocs. Backslashes correctly escape whitespace in block regexes.</li>
 <li>Closing brackets can now be indented and therefore no longer cause unexpected error.</li>
diff --git a/docs/v2/test.html b/docs/v2/test.html
index 28b3c5e848..804b116fad 100644
--- a/docs/v2/test.html
+++ b/docs/v2/test.html
@@ -860,9 +860,8 @@ <h1>CoffeeScript Test Suite</h1>
     extend = 3
     hasProp = 4
     value: 5
-    method: (bind, bind1) => [bind, bind1, extend, hasProp, @value]
-  {method} = new B
-  arrayEq [1, 2, 3, 4, 5], method 1, 2
+    method: (bind, bind1) -> [bind, bind1, extend, hasProp, @value]
+  arrayEq [1, 2, 3, 4, 5], new B().method 1, 2
 
   modulo = -1 %% 3
   eq 2, modulo
@@ -1247,42 +1246,20 @@ <h1>CoffeeScript Test Suite</h1>
   ok instance.name() is 'class'
 
 
-test "Classes with methods that are pre-bound to the instance, or statically, to the class", ->
+test "Classes with methods that are pre-bound statically, to the class", ->
 
   class Dog
     constructor: (name) ->
       @name = name
 
-    bark: =>
-      "#{@name} woofs!"
-
     @static = =>
       new this('Dog')
 
-  spark = new Dog('Spark')
-  fido  = new Dog('Fido')
-  fido.bark = spark.bark
-
-  ok fido.bark() is 'Spark woofs!'
-
   obj = func: Dog.static
 
   ok obj.func().name is 'Dog'
 
 
-test "a bound function in a bound function", ->
-
-  class Mini
-    num: 10
-    generate: =>
-      for i in [1..3]
-        =>
-          @num
-
-  m = new Mini
-  eq (func() for func in m.generate()).join(' '), '10 10 10'
-
-
 test "contructor called with varargs", ->
 
   class Connection
@@ -1587,21 +1564,6 @@ <h1>CoffeeScript Test Suite</h1>
     @B: makeFn 2
     constructor: makeFn 3
 
-test "#1182: external constructors with bound functions", ->
-  fn = ->
-    {one: 1}
-    this
-  class B
-  class A
-    constructor: fn
-    method: => this instanceof A
-  ok (new A).method.call(new B)
-
-test "#1372: bound class methods with reserved names", ->
-  class C
-    delete: =>
-  ok C::delete
-
 test "#1380: `super` with reserved names", ->
   class C
     do: -> super()
@@ -1670,7 +1632,7 @@ <h1>CoffeeScript Test Suite</h1>
     @unbound: ->
       eq this, Store
 
-    instance: =>
+    instance: ->
       ok this instanceof Store
 
   Store.bound()
@@ -1833,57 +1795,6 @@ <h1>CoffeeScript Test Suite</h1>
   ok overrideArray instanceof OverrideArray
   eq 'yes!', overrideArray.method()
 
-
-test "#2782: non-alphanumeric-named bound functions", ->
-  class A
-    'b:c': =>
-      'd'
-
-  eq (new A)['b:c'](), 'd'
-
-
-test "#2781: overriding bound functions", ->
-  class A
-    a: ->
-        @b()
-    b: =>
-        1
-
-  class B extends A
-    b: =>
-        2
-
-  b = (new A).b
-  eq b(), 1
-
-  b = (new B).b
-  eq b(), 2
-
-
-test "#2791: bound function with destructured argument", ->
-  class Foo
-    method: ({a}) => 'Bar'
-
-  eq (new Foo).method({a: 'Bar'}), 'Bar'
-
-
-test "#2796: ditto, ditto, ditto", ->
-  answer = null
-
-  outsideMethod = (func) ->
-    func.call message: 'wrong!'
-
-  class Base
-    constructor: ->
-      @message = 'right!'
-      outsideMethod @echo
-
-    echo: =>
-      answer = @message
-
-  new Base
-  eq answer, 'right!'
-
 test "#3063: Class bodies cannot contain pure statements", ->
   throws -> CoffeeScript.compile """
     class extends S
@@ -2095,9 +2006,6 @@ <h1>CoffeeScript Test Suite</h1>
       eq result.super, this
       eq result.param, @param
       eq result.method, @method
-      ok result.method isnt Test::method
-
-    method: =>
 
   nonce = {}
   new Test nonce, {}
@@ -2117,8 +2025,6 @@ <h1>CoffeeScript Test Suite</h1>
         super 'not param'
         eq @name, 'not param'
       eq @param, nonce
-      ok @method isnt Test::method
-    method: =>
   new Test true, nonce
   new Test false, nonce
 
@@ -2137,16 +2043,13 @@ <h1>CoffeeScript Test Suite</h1>
           eq (super 'param'), @;
           eq @name, 'param';
           eq @param, nonce;
-          ok @method isnt Test::method
         )
       else
         result = (
           eq (super 'not param'), @;
           eq @name, 'not param';
           eq @param, nonce;
-          ok @method isnt Test::method
         )
-    method: =>
   new Test true, nonce
   new Test false, nonce
 
@@ -2348,7 +2251,7 @@ <h1>CoffeeScript Test Suite</h1>
     make: -> "Making a #{@drink}"
 
   class B extends A
-    make: (@flavor) =>
+    make: (@flavor) ->
       super() + " with #{@flavor}"
 
   b = new B('Machiato')
@@ -2356,7 +2259,7 @@ <h1>CoffeeScript Test Suite</h1>
 
   # super in a bound function in a bound function
   class C extends A
-    make: (@flavor) =>
+    make: (@flavor) ->
       func = () =>
         super() + " with #{@flavor}"
       func()
@@ -9638,6 +9541,28 @@ <h1>CoffeeScript Test Suite</h1>
     };"""
   eq toJS(input), output
 
+test "export default implicit object", ->
+  input = "export default foo: 'bar', baz: 'qux'"
+  output = """
+    export default {
+      foo: 'bar',
+      baz: 'qux'
+    };"""
+  eq toJS(input), output
+
+test "export default multiline implicit object", ->
+  input = """
+    export default
+      foo: 'bar',
+      baz: 'qux'
+    """
+  output = """
+    export default {
+      foo: 'bar',
+      baz: 'qux'
+    };"""
+  eq toJS(input), output
+
 test "export default assignment expression", ->
   input = "export default foo = 'bar'"
   output = """
@@ -10855,6 +10780,18 @@ <h1>CoffeeScript Test Suite</h1>
   eq 1, obj[1]
   eq 2, obj.a
 
+test "#1263: Braceless object return", ->
+  fn = ->
+    return
+      a: 1
+      b: 2
+      c: -> 3
+
+  obj = fn()
+  eq 1, obj.a
+  eq 2, obj.b
+  eq 3, obj.c()
+
 </script>
 <script type="text/x-coffeescript" class="test" id="operators">
 # Operators
@@ -12115,16 +12052,6 @@ <h1>CoffeeScript Test Suite</h1>
       ret
   eq (new B).foo(), 10
 
-test "#2331: bound super regression", ->
-  class A
-    @value = 'A'
-    method: -> @constructor.value
-
-  class B extends A
-    method: => super()
-
-  eq (new B).method(), 'A'
-
 test "#3259: leak with @-params within destructured parameters", ->
   fn = ({@foo}, [@bar], [{@baz}]) ->
     foo = bar = baz = false
diff --git a/documentation/examples/breaking_change_super_in_non-class_methods_refactor_with_apply.coffee b/documentation/examples/breaking_change_super_in_non-class_methods_refactor_with_apply.coffee
index e6913c7a98..e97928cd1e 100644
--- a/documentation/examples/breaking_change_super_in_non-class_methods_refactor_with_apply.coffee
+++ b/documentation/examples/breaking_change_super_in_non-class_methods_refactor_with_apply.coffee
@@ -1,4 +1,18 @@
+# Helper functions
+hasProp = {}.hasOwnProperty
+extend = (child, parent) ->
+  ctor = ->
+    @constructor = child
+    return
+  for key of parent
+    if hasProp.call(parent, key)
+      child[key] = parent[key]
+  ctor.prototype = parent.prototype
+  child.prototype = new ctor
+  child
+
+
 A = ->
 B = ->
-B extends A
+extend B, A
 B.prototype.foo = -> A::foo.apply this, arguments
diff --git a/documentation/examples/do.coffee b/documentation/examples/do.coffee
index 49ec8afa61..00418b66bc 100644
--- a/documentation/examples/do.coffee
+++ b/documentation/examples/do.coffee
@@ -1,4 +1,5 @@
 for filename in list
   do (filename) ->
-    fs.readFile filename, (err, contents) ->
-      compile filename, contents.toString()
+    if filename not in ['.DS_Store', 'Thumbs.db', 'ehthumbs.db']
+      fs.readFile filename, (err, contents) ->
+        compile filename, contents.toString()
diff --git a/documentation/examples/existence_declared.coffee b/documentation/examples/existence_declared.coffee
new file mode 100644
index 0000000000..9cc21cdc6c
--- /dev/null
+++ b/documentation/examples/existence_declared.coffee
@@ -0,0 +1,4 @@
+major = 'Computer Science'
+
+unless major?
+  signUpForClass 'Introduction to Wines'
diff --git a/documentation/examples/existence_undeclared.coffee b/documentation/examples/existence_undeclared.coffee
new file mode 100644
index 0000000000..685b8e0e0c
--- /dev/null
+++ b/documentation/examples/existence_undeclared.coffee
@@ -0,0 +1,2 @@
+if window?
+  environment = 'browser (probably)'
diff --git a/documentation/sections/async_functions.md b/documentation/sections/async_functions.md
new file mode 100644
index 0000000000..8fb63a5b49
--- /dev/null
+++ b/documentation/sections/async_functions.md
@@ -0,0 +1,9 @@
+## Async Functions
+
+ES2017’s [async functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function) are supported through the `await` keyword. Like with generators, there's no need for an `async` keyword; an async function in CoffeeScript is simply a function that awaits.
+
+Similar to how `yield return` forces a generator, `await return` may be used to force a function to be async.
+
+```
+codeFor('async', true)
+```
diff --git a/documentation/sections/breaking_changes.md b/documentation/sections/breaking_changes.md
index 84564146a1..e6e8c52d66 100644
--- a/documentation/sections/breaking_changes.md
+++ b/documentation/sections/breaking_changes.md
@@ -1,142 +1,3 @@
 ## Breaking Changes From CoffeeScript 1.x to 2
 
 CoffeeScript 2 aims to output as much idiomatic ES2015+ syntax as possible with as few breaking changes from CoffeeScript 1.x as possible. Some breaking changes, unfortunately, were unavoidable.
-
-<section id="breaking-changes-default-values">
-
-### Default values for function parameters and destructured elements
-
-Per the [ES2015 spec regarding function default parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters) and [destructuring default values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Default_values), default values are only applied when a value is missing or `undefined`. In CoffeeScript 1.x, the default value would be applied in those cases but also if the  value was `null`.
-
-```
-codeFor('breaking_change_function_parameter_default_values', 'f(null)')
-```
-
-```
-codeFor('breaking_change_destructuring_default_values', 'a')
-```
-
-</section>
-<section id="breaking-changes-bound-generator-functions">
-
-### Bound generator functions
-
-Bound generator functions, a.k.a. generator arrow functions, [aren’t allowed in ECMAScript](http://stackoverflow.com/questions/27661306/can-i-use-es6s-arrow-function-syntax-with-generators-arrow-notation). You can write `function*` or `=>`, but not both. Therefore, CoffeeScript code like this:
-
-```coffee
-f = => yield this
-# Throws a compiler error
-```
-
-Needs to be rewritten the old-fashioned way:
-
-```
-codeFor('breaking_change_bound_generator_function')
-```
-
-</section>
-<section id="breaking-changes-classes">
-
-### Classes are compiled to ES2015 classes
-
-ES2015 classes and their methods have some restrictions beyond those on regular functions.
-
-Class constructors can’t be invoked without `new`:
-
-```coffee
-(class)()
-# Throws a TypeError at runtime
-```
-
-Derived (extended) class `constructor`s cannot use `this` before calling `super`:
-
-```coffee
-class B extends A
-  constructor: -> this
-  # Throws a compiler error
-```
-
-Class methods can’t be used with `new` (uncommon):
-
-```coffee
-class Namespace
-  @Klass = ->
-new Namespace.Klass
-# Throws a TypeError at runtime
-```
-
-</section>
-<section id="breaking-changes-bare-super">
-
-### Bare `super`
-
-Due to a syntax clash with `super` with accessors, bare `super` no longer compiles to a super call forwarding all arguments.
-
-```coffee
-class B extends A
-  foo: -> super
-  # Throws a compiler error
-```
-
-Arguments can be forwarded explicitly using splats:
-
-```
-codeFor('breaking_change_super_with_arguments')
-```
-
-Or if you know that the parent function doesn’t require arguments, just call `super()`:
-
-```
-codeFor('breaking_change_super_without_arguments')
-```
-
-</section>
-<section id="breaking-changes-super-in-non-class-methods">
-
-### `super` in non-class methods
-
-In CoffeeScript 1.x it is possible to use `super` in more than just class methods, such as in manually prototype-assigned functions:
-
-```coffee
-A = ->
-B = ->
-B extends A
-B.prototype.foo = -> super arguments...
-# Throws a compiler error
-```
-
-Due to the switch to ES2015 `super`, this is no longer supported. The above case could be refactored to:
-
-```
-codeFor('breaking_change_super_in_non-class_methods_refactor_with_apply')
-```
-
-or
-
-```
-codeFor('breaking_change_super_in_non-class_methods_refactor_with_class')
-```
-
-</section>
-<section id="breaking-changes-dynamic-class-keys-exclude-executable-class-scope">
-
-### Dynamic class keys exclude executable class scope
-
-Due to the hoisting required to compile to ES2015 classes, dynamic keys in class methods can’t use values from the executable class body unless the methods are assigned in prototype style.
-
-```coffee
-class A
-  name = 'method'
-  "#{name}": ->   # This method will be named 'undefined'
-  @::[name] = ->  # This will work; assigns to `A.prototype.method`
-```
-
-</section>
-
-<section id="breaking-changes-literate-coffeescript">
-
-### Literate CoffeeScript now parsed by a Markdown library
-
-The CoffeeScript 1.x implementation of Literate CoffeeScript relies on indentation to tell apart code blocks from documentation, and as such it can get confused by Markdown features that also use indentation like lists. In CoffeeScript 2 this has been refactored to now use [Markdown-It](https://github.com/markdown-it/markdown-it) to detect Markdown sections rather than just looking at indentation. The only significant difference is that now if you want to include a code block in documentation, as opposed to the compiler recognizing that code block as code, it must have at least one line fully unindented. Wrapping it in HTML tags is no longer sufficient.
-
-Code blocks interspersed with lists may need to be refactored. In general, code blocks should be separated by a blank line between documentation, and should maintain a consistent indentation level—so an indentation of one tab (or whatever you consider to be a tab stop, like 2 spaces or 4 spaces) should be treated as your code’s “left margin,” with all code in the file relative to that column.
diff --git a/documentation/sections/breaking_changes_bound_generator_functions.md b/documentation/sections/breaking_changes_bound_generator_functions.md
new file mode 100644
index 0000000000..faaa4a6c9c
--- /dev/null
+++ b/documentation/sections/breaking_changes_bound_generator_functions.md
@@ -0,0 +1,14 @@
+### Bound generator functions
+
+Bound generator functions, a.k.a. generator arrow functions, [aren’t allowed in ECMAScript](http://stackoverflow.com/questions/27661306/can-i-use-es6s-arrow-function-syntax-with-generators-arrow-notation). You can write `function*` or `=>`, but not both. Therefore, CoffeeScript code like this:
+
+```coffee
+f = => yield this
+# Throws a compiler error
+```
+
+Needs to be rewritten the old-fashioned way:
+
+```
+codeFor('breaking_change_bound_generator_function')
+```
diff --git a/documentation/sections/breaking_changes_classes.md b/documentation/sections/breaking_changes_classes.md
new file mode 100644
index 0000000000..59800439fd
--- /dev/null
+++ b/documentation/sections/breaking_changes_classes.md
@@ -0,0 +1,36 @@
+### Classes are compiled to ES2015 classes
+
+ES2015 classes and their methods have some restrictions beyond those on regular functions.
+
+Class constructors can’t be invoked without `new`:
+
+```coffee
+(class)()
+# Throws a TypeError at runtime
+```
+
+Derived (extended) class `constructor`s cannot use `this` before calling `super`:
+
+```coffee
+class B extends A
+  constructor: -> this
+  # Throws a compiler error
+```
+
+Class methods can’t be used with `new` (uncommon):
+
+```coffee
+class Namespace
+  @Klass = ->
+new Namespace.Klass
+# Throws a TypeError at runtime
+```
+
+Due to the hoisting required to compile to ES2015 classes, dynamic keys in class methods can’t use values from the executable class body unless the methods are assigned in prototype style.
+
+```coffee
+class A
+  name = 'method'
+  "#{name}": ->   # This method will be named 'undefined'
+  @::[name] = ->  # This will work; assigns to `A.prototype.method`
+```
diff --git a/documentation/sections/breaking_changes_default_values.md b/documentation/sections/breaking_changes_default_values.md
new file mode 100644
index 0000000000..ff913a2135
--- /dev/null
+++ b/documentation/sections/breaking_changes_default_values.md
@@ -0,0 +1,11 @@
+### Default values for function parameters and destructured elements
+
+Per the [ES2015 spec regarding function default parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Default_parameters) and [destructuring default values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Default_values), default values are only applied when a value is missing or `undefined`. In CoffeeScript 1.x, the default value would be applied in those cases but also if the  value was `null`.
+
+```
+codeFor('breaking_change_function_parameter_default_values', 'f(null)')
+```
+
+```
+codeFor('breaking_change_destructuring_default_values', 'a')
+```
diff --git a/documentation/sections/breaking_changes_literate_coffeescript.md b/documentation/sections/breaking_changes_literate_coffeescript.md
new file mode 100644
index 0000000000..873a318463
--- /dev/null
+++ b/documentation/sections/breaking_changes_literate_coffeescript.md
@@ -0,0 +1,7 @@
+### Literate CoffeeScript parsing
+
+CoffeeScript 2’s parsing of Literate CoffeeScript has been refactored to now be more careful about not treating indented lists as code blocks; but this means that all code blocks (unless they are to be interpreted as comments) must be separated by at least one blank line from lists.
+
+Code blocks should also now maintain a consistent indentation level—so an indentation of one tab (or whatever you consider to be a tab stop, like 2 spaces or 4 spaces) should be treated as your code’s “left margin,” with all code in the file relative to that column.
+
+Code blocks that you want to be part of the commentary, and not executed, must have at least one line (ideally the first line of the block) completely unindented.
diff --git a/documentation/sections/breaking_changes_super_extends.md b/documentation/sections/breaking_changes_super_extends.md
new file mode 100644
index 0000000000..11f3c7a36e
--- /dev/null
+++ b/documentation/sections/breaking_changes_super_extends.md
@@ -0,0 +1,43 @@
+### `super` and `extends`
+
+Due to a syntax clash with `super` with accessors, “bare” `super` (the keyword `super` without parentheses) no longer compiles to a super call forwarding all arguments.
+
+```coffee
+class B extends A
+  foo: -> super
+  # Throws a compiler error
+```
+
+Arguments can be forwarded explicitly using splats:
+
+```
+codeFor('breaking_change_super_with_arguments')
+```
+
+Or if you know that the parent function doesn’t require arguments, just call `super()`:
+
+```
+codeFor('breaking_change_super_without_arguments')
+```
+
+CoffeeScript 1.x allowed the `extends` keyword to set up prototypal inheritance between functions, and `super` could be used manually prototype-assigned functions:
+
+```coffee
+A = ->
+B = ->
+B extends A
+B.prototype.foo = -> super arguments...
+# Last two lines each throw compiler errors in CoffeeScript 2
+```
+
+Due to the switch to ES2015 `extends` and `super`, using these keywords for prototypal functions are no longer supported. The above case could be refactored to:
+
+```
+codeFor('breaking_change_super_in_non-class_methods_refactor_with_apply')
+```
+
+or
+
+```
+codeFor('breaking_change_super_in_non-class_methods_refactor_with_class')
+```
diff --git a/documentation/sections/chaining.md b/documentation/sections/chaining.md
new file mode 100644
index 0000000000..7e781a7389
--- /dev/null
+++ b/documentation/sections/chaining.md
@@ -0,0 +1,7 @@
+## Chaining Function Calls
+
+Leading `.` closes all open calls, allowing for simpler chaining syntax.
+
+```
+codeFor('chaining')
+```
diff --git a/documentation/sections/changelog.md b/documentation/sections/changelog.md
index 83ee1189e6..624bbf4c88 100644
--- a/documentation/sections/changelog.md
+++ b/documentation/sections/changelog.md
@@ -206,11 +206,6 @@ releaseHeader('2014-01-28', '1.7.0', '1.6.3')
 *   When requiring CoffeeScript files in Node you must now explicitly register the compiler. This can be done with `require 'coffeescript/register'` or `CoffeeScript.register()`. Also for configuration such as Mocha’s, use **coffeescript/register**.
 *   Improved error messages, source maps and stack traces. Source maps now use the updated `//#` syntax.
 *   Leading `.` now closes all open calls, allowing for simpler chaining syntax.
-
-```
-codeFor('chaining')
-```
-
 *   Added `**`, `//` and `%%` operators and `...` expansion in parameter lists and destructuring expressions.
 *   Multiline strings are now joined by a single space and ignore all indentation. A backslash at the end of a line can denote the amount of whitespace between lines, in both strings and heredocs. Backslashes correctly escape whitespace in block regexes.
 *   Closing brackets can now be indented and therefore no longer cause unexpected error.
diff --git a/documentation/sections/coffeescript_2.md b/documentation/sections/coffeescript_2.md
index f0d4195c29..49f4fb6421 100644
--- a/documentation/sections/coffeescript_2.md
+++ b/documentation/sections/coffeescript_2.md
@@ -1,21 +1,17 @@
 ## CoffeeScript 2
 
-### Why CoffeeScript When There’s ES2015+?
+### What’s New In CoffeeScript 2?
 
-CoffeeScript introduced many new features to the JavaScript world, such as [`=>`](#fat-arrow) and [destructuring](#destructuring) and [classes](#classes). We are happy that ECMA has seen their utility and adopted them into ECMAScript.
+The biggest change in CoffeeScript 2 is that now the CoffeeScript compiler produces modern, ES2015+ JavaScript. A CoffeeScript `=>` becomes an ES `=>`, a CoffeeScript `class` becomes an ES `class` and so on. With the exception of modules (`import` and `export` statements), all the ES2015+ features that CoffeeScript supports can run natively in Node 7.6+, meaning that Node can run CoffeeScript’s output without any further processing required. You can [run the tests in your browser](http://coffeescript.org/v<%= majorVersion %>/test.html) to see if your browser can do the same; Chrome has supported all features since version 55.
 
-CoffeeScript’s intent, however, was never to be a superset of JavaScript. One of the guiding principles of CoffeeScript has been _simplicity:_ not just removing JavaScript’s “bad parts,” but providing a cleaner, terser syntax that uses less punctuation and enforces indentation, to make code easier to read and reason about. Increased clarity leads to increased quality, and fewer bugs. This benefit of CoffeeScript remains, even in an ES2015+ world.
+Support for ES2015+ syntax is important to ensure compatibility with frameworks that assume ES2015. Now that CoffeeScript compiles classes to the ES `class` keyword, it’s possible to `extend` an ES class; that wasn’t possible in CoffeeScript 1. Parity in how language features work is also important on its own; CoffeeScript “is just JavaScript,” and so things like [function parameter default values](#breaking-changes-default-values) should behave the same in CoffeeScript as in JavaScript.
 
-### ES2015+ Output
+Many ES2015+ features have been backported to CoffeeScript 1.11 and 1.12, including [modules](#modules), [`for…of`](#generator-iteration), and [tagged template literals](#tagged-template-literals). One major new feature unique to CoffeeScript 2 is support for ES2017’s [async functions](#async-functions). More details are in the [changelog](#changelog).
 
-CoffeeScript 2 supports many of the latest ES2015+ features, output using ES2015+ syntax. If you’re looking for a single tool that takes CoffeeScript input and generates JavaScript output that runs in any JavaScript runtime, assuming you opt out of certain newer features, stick to the [CoffeeScript 1.x branch](/v1/). CoffeeScript 2 [breaks compatibility](#breaking-changes) with certain CoffeeScript 1.x features in order to conform with the ES2015+ specifications, and generate more idiomatic output (a CoffeeScript `=>` becomes an ES `=>`; a CoffeeScript `class` becomes an ES `class`; and so on).
+There are very few [breaking changes from CoffeeScript 1.x to 2](#breaking-changes); we hope the upgrade process is smooth for most projects.
 
-Since the CoffeeScript 2 compiler outputs ES2015+ syntax, it is your responsibility to either ensure that your target JavaScript runtime(s) support all these features, or that you pass the output through another transpiler like [Babel](http://babeljs.io/), [Rollup](https://github.com/rollup/rollup) or [Traceur Compiler](https://github.com/google/traceur-compiler). In general, [CoffeeScript 2’s output is supported as is by Node.js 7.6+](http://node.green/), except for modules which require transpilation.
+### Why CoffeeScript When There’s ES2015?
 
-There are many great task runners for setting up JavaScript build chains, such as [Gulp](http://gulpjs.com/), [Webpack](https://webpack.github.io/), [Grunt](https://gruntjs.com/) and [Broccoli](http://broccolijs.com/). If you’re looking for a very minimal solution to get started, you can use [babel-preset-env](https://babeljs.io/docs/plugins/preset-env/) and the command line:
+CoffeeScript introduced many new features to the JavaScript world, such as [`=>`](#fat-arrow) and [destructuring](#destructuring) and [classes](#classes). We are happy that ECMA has seen their utility and adopted them into ECMAScript.
 
-```bash
-npm install --global coffeescript@next
-npm install --save-dev coffeescript@next babel-cli babel-preset-env
-coffee -p *.coffee | babel --presets env > app.js
-```
+CoffeeScript’s intent, however, was never to be a superset of JavaScript. One of the guiding principles of CoffeeScript has been _simplicity:_ not just removing JavaScript’s “bad parts,” but providing an elegant, concise syntax that eschews unnecessary punctuation whenever possible, to make code easier to read and reason about. This benefit of CoffeeScript remains, even in an ES2015 world.
diff --git a/documentation/sections/conditionals.md b/documentation/sections/conditionals.md
index c5b832a40e..6f99cbb1ba 100644
--- a/documentation/sections/conditionals.md
+++ b/documentation/sections/conditionals.md
@@ -1,8 +1,8 @@
 ## If, Else, Unless, and Conditional Assignment
 
-**If/else** statements can be written without the use of parentheses and curly brackets. As with functions and other block expressions, multi-line conditionals are delimited by indentation. There’s also a handy postfix form, with the `if` or `unless` at the end.
+`if`/`else` statements can be written without the use of parentheses and curly brackets. As with functions and other block expressions, multi-line conditionals are delimited by indentation. There’s also a handy postfix form, with the `if` or `unless` at the end.
 
-CoffeeScript can compile **if** statements into JavaScript expressions, using the ternary operator when possible, and closure wrapping otherwise. There is no explicit ternary statement in CoffeeScript — you simply use a regular **if** statement on a single line.
+CoffeeScript can compile `if` statements into JavaScript expressions, using the ternary operator when possible, and closure wrapping otherwise. There is no explicit ternary statement in CoffeeScript — you simply use a regular `if` statement on a single line.
 
 ```
 codeFor('conditionals')
diff --git a/documentation/sections/destructuring.md b/documentation/sections/destructuring.md
index dca2019f63..e960fc073d 100644
--- a/documentation/sections/destructuring.md
+++ b/documentation/sections/destructuring.md
@@ -36,4 +36,4 @@ Destructuring assignment is also useful when combined with class constructors to
 codeFor('constructor_destructuring', 'tim.age + " " + tim.height')
 ```
 
-The above example also demonstrates that if properties are missing in the destructured object or array, you can, just like in JavaScript, provide defaults. The difference with JavaScript is that CoffeeScript, as always, treats both null and undefined the same.
+The above example also demonstrates that if properties are missing in the destructured object or array, you can, just like in JavaScript, provide defaults. Note though that unlike with the existential operator, the default is only applied with the value is missing or `undefined`—[passing `null` will set a value of `null`](#breaking-changes-default-values), not the default.
diff --git a/documentation/sections/existential_operator.md b/documentation/sections/existential_operator.md
index d880fa7762..a8cfe9ac24 100644
--- a/documentation/sections/existential_operator.md
+++ b/documentation/sections/existential_operator.md
@@ -1,17 +1,37 @@
 ## The Existential Operator
 
-It’s a little difficult to check for the existence of a variable in JavaScript. `if (variable) …` comes close, but fails for zero, the empty string, and false. CoffeeScript’s existential operator `?` returns true unless a variable is **null** or **undefined**, which makes it analogous to Ruby’s `nil?`
+It’s a little difficult to check for the existence of a variable in JavaScript. `if (variable) …` comes close, but fails for zero, the empty string, and false (to name just the most common cases). CoffeeScript’s existential operator `?` returns true unless a variable is `null` or `undefined` or undeclared, which makes it analogous to Ruby’s `nil?`.
 
-It can also be used for safer conditional assignment than `||=` provides, for cases where you may be handling numbers or strings.
+It can also be used for safer conditional assignment than the JavaScript pattern `a = a || value` provides, for cases where you may be handling numbers or strings.
 
 ```
 codeFor('existence', 'footprints')
 ```
 
-The accessor variant of the existential operator `?.` can be used to soak up null references in a chain of properties. Use it instead of the dot accessor `.` in cases where the base value may be **null** or **undefined**. If all of the properties exist then you’ll get the expected result, if the chain is broken, **undefined** is returned instead of the **TypeError** that would be raised otherwise.
+Note that if the compiler knows that `a` is in scope and therefore declared, `a?` compiles to `a != null`, _not_ `a !== null`. The `!=` makes a loose comparison to `null`, which does double duty also comparing against `undefined`. The reverse also holds for `not a?` or `unless a?`.
+
+```
+codeFor('existence_declared')
+```
+
+If a variable might be undeclared, the compiler does a thorough check. This is what JavaScript coders _should_ be typing when they want to check if a mystery variable exists.
+
+```
+codeFor('existence_undeclared')
+```
+
+The accessor variant of the existential operator `?.` can be used to soak up null references in a chain of properties. Use it instead of the dot accessor `.` in cases where the base value may be `null` or `undefined`. If all of the properties exist then you’ll get the expected result, if the chain is broken, `undefined` is returned instead of the `TypeError` that would be raised otherwise.
 
 ```
 codeFor('soaks')
 ```
 
-Soaking up nulls is similar to Ruby’s [andand gem](https://rubygems.org/gems/andand), and to the [safe navigation operator](http://docs.groovy-lang.org/latest/html/documentation/index.html#_safe_navigation_operator) in Groovy.
+For completeness:
+
+| Example | Definition |
+| --- | --- |
+| `a?` | tests that `a` is in scope and `a != null` |
+| `a ? b` | returns `a` if `a` is in scope and `a != null`; otherwise, `b` |
+| `a?.b` or `a?['b']` | returns `a.b` if `a` is in scope and `a != null`; otherwise, `undefined` |
+| `a?(b, c)` or `a? b, c`&emsp; | returns the result of calling `a` (with arguments `b` and `c`) if `a` is in scope and callable; otherwise, `undefined` |
+| `a ?= b` | assigns the value of `b` to `a` if `a` is not in scope or if `a == null`; produces the new value of `a` |
\ No newline at end of file
diff --git a/documentation/sections/expressions.md b/documentation/sections/expressions.md
index d2bec3f3c6..df5e2219d1 100644
--- a/documentation/sections/expressions.md
+++ b/documentation/sections/expressions.md
@@ -20,7 +20,7 @@ Things that would otherwise be statements in JavaScript, when used as part of an
 codeFor('expressions_comprehension', 'globals')
 ```
 
-As well as silly things, like passing a **try/catch** statement directly into a function call:
+As well as silly things, like passing a `try`/`catch` statement directly into a function call:
 
 ```
 codeFor('expressions_try', true)
diff --git a/documentation/sections/fat_arrow.md b/documentation/sections/fat_arrow.md
index c2badc4366..a652949701 100644
--- a/documentation/sections/fat_arrow.md
+++ b/documentation/sections/fat_arrow.md
@@ -1,4 +1,4 @@
-## Function Modifiers
+## Bound (Fat Arrow) Functions
 
 In JavaScript, the `this` keyword is dynamically scoped to mean the object that the current function is attached to. If you pass a function as a callback or attach it to a different object, the original value of `this` will be lost. If you’re not familiar with this behavior, [this Digital Web article](http://64.13.255.16/articles/scope_in_javascript/) gives a good overview of the quirks.
 
@@ -10,29 +10,4 @@ codeFor('fat_arrow')
 
 If we had used `->` in the callback above, `@customer` would have referred to the undefined “customer” property of the DOM element, and trying to call `purchase()` on it would have raised an exception.
 
-When used in a class definition, methods declared with the fat arrow will be automatically bound to each instance of the class when the instance is constructed.
-
-<div id="generator-functions" class="bookmark"></div>
-<div id="async-functions" class="bookmark"></div>
-
-CoffeeScript also supports [generator functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*) and [async functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function) through the `yield` and `await` keywords respectively. There's no `function*(){}` or `async function(){}` nonsense — a generator in CoffeeScript is simply a function that yields, and an async function in CoffeeScript is simply a function that awaits.
-
-```
-codeFor('generators', 'ps.next().value')
-```
-
-`yield*` is called `yield from`, and `yield return` may be used if you need to force a generator that doesn’t yield.
-
-<div id="generator-iteration" class="bookmark"></div>
-
-You can iterate over a generator function using `for…from`.
-
-```
-codeFor('generator_iteration', 'getFibonacciNumbers(10)')
-```
-
-Similar to how `yield return` forces a generator, `await return` may be used to force a function to be async.
-
-```
-codeFor('async', true)
-```
+The fat arrow was one of the most popular features of CoffeeScript, and ES2015 [adopted it](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions); so CoffeeScript 2 compiles `=>` to ES `=>`.
diff --git a/documentation/sections/generators.md b/documentation/sections/generators.md
new file mode 100644
index 0000000000..34e0abd9b4
--- /dev/null
+++ b/documentation/sections/generators.md
@@ -0,0 +1,17 @@
+## Generator Functions
+
+CoffeeScript supports ES2015 [generator functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*) through the `yield` keyword. There's no `function*(){}` nonsense — a generator in CoffeeScript is simply a function that yields.
+
+```
+codeFor('generators', 'ps.next().value')
+```
+
+`yield*` is called `yield from`, and `yield return` may be used if you need to force a generator that doesn’t yield.
+
+<div id="generator-iteration" class="bookmark"></div>
+
+You can iterate over a generator function using `for…from`.
+
+```
+codeFor('generator_iteration', 'getFibonacciNumbers(10)')
+```
diff --git a/documentation/sections/lexical_scope.md b/documentation/sections/lexical_scope.md
index 1df24cee79..468c99d4f5 100644
--- a/documentation/sections/lexical_scope.md
+++ b/documentation/sections/lexical_scope.md
@@ -6,10 +6,12 @@ The CoffeeScript compiler takes care to make sure that all of your variables are
 codeFor('scope', 'inner')
 ```
 
-Notice how all of the variable declarations have been pushed up to the top of the closest scope, the first time they appear. **outer** is not redeclared within the inner function, because it’s already in scope; **inner** within the function, on the other hand, should not be able to change the value of the external variable of the same name, and therefore has a declaration of its own.
+Notice how all of the variable declarations have been pushed up to the top of the closest scope, the first time they appear. `outer` is not redeclared within the inner function, because it’s already in scope; `inner` within the function, on the other hand, should not be able to change the value of the external variable of the same name, and therefore has a declaration of its own.
 
-This behavior is effectively identical to Ruby’s scope for local variables. Because you don’t have direct access to the `var` keyword, it’s impossible to shadow an outer variable on purpose, you may only refer to it. So be careful that you’re not reusing the name of an external variable accidentally, if you’re writing a deeply nested function.
+Because you don’t have direct access to the `var` keyword, it’s impossible to shadow an outer variable on purpose, you may only refer to it. So be careful that you’re not reusing the name of an external variable accidentally, if you’re writing a deeply nested function.
 
-Although suppressed within this documentation for clarity, all CoffeeScript output is wrapped in an anonymous function: `(function(){ … })();` This safety wrapper, combined with the automatic generation of the `var` keyword, make it exceedingly difficult to pollute the global namespace by accident.
+Although suppressed within this documentation for clarity, all CoffeeScript output (except in files with `import` or `export` statements) is wrapped in an anonymous function: `(function(){ … })();`. This safety wrapper, combined with the automatic generation of the `var` keyword, make it exceedingly difficult to pollute the global namespace by accident. (The safety wrapper can be disabled with the [`bare` option](#usage), and is unnecessary and automatically disabled when using modules.)
 
-If you’d like to create top-level variables for other scripts to use, attach them as properties on **window**; attach them as properties on the **exports** object in CommonJS; or use an [`export` statement](#modules). If you’re targeting both CommonJS and the browser, the **existential operator** (covered below), gives you a reliable way to figure out where to add them: `exports ? this`
+If you’d like to create top-level variables for other scripts to use, attach them as properties on `window`; attach them as properties on the `exports` object in CommonJS; or use an [`export` statement](#modules). If you’re targeting both CommonJS and the browser, the [existential operator](#existential-operator) (covered below), gives you a reliable way to figure out where to add them: `exports ? this`.
+
+Since CoffeeScript takes care of all variable declaration, it is not possible to declare variables with ES2015’s `let` or `const`. [This is intentional](#unsupported-let-const); we feel that the simplicity gained by not having to think about variable declaration outweighs the benefit of having three separate ways to declare variables.
\ No newline at end of file
diff --git a/documentation/sections/loops.md b/documentation/sections/loops.md
index 5f2241b3c3..bd228bd92f 100644
--- a/documentation/sections/loops.md
+++ b/documentation/sections/loops.md
@@ -1,12 +1,12 @@
 ## Loops and Comprehensions
 
-Most of the loops you’ll write in CoffeeScript will be **comprehensions** over arrays, objects, and ranges. Comprehensions replace (and compile into) **for** loops, with optional guard clauses and the value of the current array index. Unlike for loops, array comprehensions are expressions, and can be returned and assigned.
+Most of the loops you’ll write in CoffeeScript will be **comprehensions** over arrays, objects, and ranges. Comprehensions replace (and compile into) `for` loops, with optional guard clauses and the value of the current array index. Unlike for loops, array comprehensions are expressions, and can be returned and assigned.
 
 ```
 codeFor('array_comprehensions')
 ```
 
-Comprehensions should be able to handle most places where you otherwise would use a loop, **each**/**forEach**, **map**, or **select**/**filter**, for example:<br>
+Comprehensions should be able to handle most places where you otherwise would use a loop, `each`/`forEach`, `map`, or `select`/`filter`, for example:<br>
 `shortNames = (name for name in list when name.length < 5)`<br>
 If you know the start and end of your loop, or would like to step through in fixed-size increments, you can use a range to specify the start and end of your comprehension.
 
@@ -32,13 +32,13 @@ If you would like to iterate over just the keys that are defined on the object i
 
 To iterate a generator function, use `from`. See [Generator Functions](#generator-iteration).
 
-The only low-level loop that CoffeeScript provides is the **while** loop. The main difference from JavaScript is that the **while** loop can be used as an expression, returning an array containing the result of each iteration through the loop.
+The only low-level loop that CoffeeScript provides is the `while` loop. The main difference from JavaScript is that the `while` loop can be used as an expression, returning an array containing the result of each iteration through the loop.
 
 ```
 codeFor('while', 'lyrics.join("\\n")')
 ```
 
-For readability, the **until** keyword is equivalent to `while not`, and the **loop** keyword is equivalent to `while true`.
+For readability, the `until` keyword is equivalent to `while not`, and the `loop` keyword is equivalent to `while true`.
 
 When using a JavaScript loop to generate functions, it’s common to insert a closure wrapper in order to ensure that loop variables are closed over, and all the generated functions don’t just share the final values. CoffeeScript provides the `do` keyword, which immediately invokes a passed function, forwarding any arguments.
 
diff --git a/documentation/sections/operators.md b/documentation/sections/operators.md
index 6e412a9cb8..29be8795b0 100644
--- a/documentation/sections/operators.md
+++ b/documentation/sections/operators.md
@@ -6,7 +6,7 @@ You can use `not` as an alias for `!`.
 
 For logic, `and` compiles to `&&`, and `or` into `||`.
 
-Instead of a newline or semicolon, `then` can be used to separate conditions from expressions, in **while**, **if**/**else**, and **switch**/**when** statements.
+Instead of a newline or semicolon, `then` can be used to separate conditions from expressions, in `while`, `if`/`else`, and `switch`/`when` statements.
 
 As in [YAML](http://yaml.org/), `on` and `yes` are the same as boolean `true`, while `off` and `no` are boolean `false`.
 
@@ -16,6 +16,8 @@ As a shortcut for `this.property`, you can use `@property`.
 
 You can use `in` to test for array presence, and `of` to test for JavaScript object-key presence.
 
+In a `for` loop, `from` compiles to the [ES2015 `of`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of). (Yes, it’s unfortunate; the CoffeeScript `of` predates the ES2015 `of`.)
+
 To simplify math expressions, `**` can be used for exponentiation and `//` performs integer division. `%` works just like in JavaScript, while `%%` provides [“dividend dependent modulo”](https://en.wikipedia.org/wiki/Modulo_operation):
 
 ```
@@ -34,8 +36,9 @@ All together now:
 | `true`, `yes`, `on` | `true` |
 | `false`, `no`, `off`&emsp; | `false` |
 | `@`, `this` | `this` |
-| `of` | `in` |
-| `in` | _no JS equivalent_ |
+| `a in b` | `[].indexOf.call(b, a) >= 0` |
+| `a of b` | `a in b` |
+| `for a from b` | `for (a of b)` |
 | `a ** b` | `Math.pow(a, b)` |
 | `a // b` | `Math.floor(a / b)` |
 | `a %% b` | `(a % b + b) % b` |
diff --git a/documentation/sections/splats.md b/documentation/sections/splats.md
index 397d9fd6d6..d1e3a02e34 100644
--- a/documentation/sections/splats.md
+++ b/documentation/sections/splats.md
@@ -1,6 +1,6 @@
 ## Splats…
 
-The JavaScript **arguments object** is a useful way to work with functions that accept variable numbers of arguments. CoffeeScript provides splats `...`, both for function definition as well as invocation, making variable numbers of arguments a little bit more palatable.
+The JavaScript `arguments` object is a useful way to work with functions that accept variable numbers of arguments. CoffeeScript provides splats `...`, both for function definition as well as invocation, making variable numbers of arguments a little bit more palatable.
 
 ```
 codeFor('splats', true)
diff --git a/documentation/sections/switch.md b/documentation/sections/switch.md
index bc533b191c..7ff343a623 100644
--- a/documentation/sections/switch.md
+++ b/documentation/sections/switch.md
@@ -1,14 +1,14 @@
 ## Switch/When/Else
 
-**Switch** statements in JavaScript are a bit awkward. You need to remember to **break** at the end of every **case** statement to avoid accidentally falling through to the default case. CoffeeScript prevents accidental fall-through, and can convert the `switch` into a returnable, assignable expression. The format is: `switch` condition, `when` clauses, `else` the default case.
+`switch` statements in JavaScript are a bit awkward. You need to remember to `break` at the end of every `case` statement to avoid accidentally falling through to the default case. CoffeeScript prevents accidental fall-through, and can convert the `switch` into a returnable, assignable expression. The format is: `switch` condition, `when` clauses, `else` the default case.
 
-As in Ruby, **switch** statements in CoffeeScript can take multiple values for each **when** clause. If any of the values match, the clause runs.
+As in Ruby, `switch` statements in CoffeeScript can take multiple values for each `when` clause. If any of the values match, the clause runs.
 
 ```
 codeFor('switch')
 ```
 
-Switch statements can also be used without a control expression, turning them in to a cleaner alternative to if/else chains.
+`switch` statements can also be used without a control expression, turning them in to a cleaner alternative to `if`/`else` chains.
 
 ```
 codeFor('switch_with_no_expression')
diff --git a/documentation/sections/test.md b/documentation/sections/test.md
index e64dbfddf8..0e14c1844c 100644
--- a/documentation/sections/test.md
+++ b/documentation/sections/test.md
@@ -4,4 +4,4 @@ CoffeeScript includes an extensive test suite, which verifies that the compiler
 
 Note that since no JavaScript runtime yet supports ES2015 modules, the tests for module support verify only that the CoffeeScript compiler’s output is the correct syntax; the tests don’t verify that the modules resolve properly.
 
-[Run the tests in your browser.](http://coffeescript.dev/v<%= majorVersion %>/test.html)
+[Run the tests in your browser.](http://coffeescript.org/v<%= majorVersion %>/test.html)
diff --git a/documentation/sections/try.md b/documentation/sections/try.md
index f39ff674f7..0991765062 100644
--- a/documentation/sections/try.md
+++ b/documentation/sections/try.md
@@ -1,6 +1,6 @@
 ## Try/Catch/Finally
 
-Try-expressions have the same semantics as try-statements in JavaScript, though in CoffeeScript, you may omit _both_ the catch and finally parts. The catch part may also omit the error parameter if it is not needed.
+`try` expressions have the same semantics as `try` statements in JavaScript, though in CoffeeScript, you may omit _both_ the catch and finally parts. The catch part may also omit the error parameter if it is not needed.
 
 ```
 codeFor('try')
diff --git a/documentation/sections/unsupported.md b/documentation/sections/unsupported.md
index fd40a21048..9291a64029 100644
--- a/documentation/sections/unsupported.md
+++ b/documentation/sections/unsupported.md
@@ -1,34 +1,3 @@
 ## Unsupported ECMAScript Features
 
 There are a few ECMAScript features that CoffeeScript intentionally doesn’t support.
-
-<section id="unsupported-let-const">
-
-### `let` and `const`: Block-Scoped and Reassignment-Protected Variables
-
-When CoffeeScript was designed, `var` was [intentionally omitted](https://github.com/jashkenas/coffeescript/issues/238#issuecomment-153502). This was to spare developers the mental housekeeping of needing to worry about variable _declaration_ (`var foo`) as opposed to variable _assignment_ (`foo = 1`). The CoffeeScript compiler automatically takes care of declaration for you, by generating `var` statements at the top of every function scope. This makes it impossible to accidentally declare a global variable.
-
-`let` and `const` add a useful ability to JavaScript in that you can use them to declare variables within a _block_ scope, for example within an `if` statement body or a `for` loop body, whereas `var` always declares variables in the scope of an entire function. When CoffeeScript 2 was designed, there was much discussion of whether this functionality was useful enough to outweigh the simplicity offered by never needing to consider variable declaration in CoffeeScript. In the end, it was decided that the simplicity was more valued. In CoffeeScript there remains only one type of variable.
-
-Keep in mind that `const` only protects you from _reassigning_ a variable; it doesn’t prevent the variable’s value from changing, the way constants usually do in other languages:
-
-```js
-const obj = {foo: 'bar'};
-obj.foo = 'baz'; // Allowed!
-obj = {}; // Throws error
-```
-
-</section>
-<section id="unsupported-get-set">
-
-### `get` and `set` Keyword Shorthand Syntax
-
-`get` and `set`, as keywords preceding functions or class methods, are intentionally unimplemented in CoffeeScript.
-
-This is to avoid grammatical ambiguity, since in CoffeeScript such a construct looks identical to a function call (e.g. `get(function foo() {})`); and because there is an [alternate syntax](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty) that is slightly more verbose but just as effective:
-
-```
-codeFor('get_set', 'screen.height')
-```
-
-</section>
diff --git a/documentation/sections/unsupported_get_set.md b/documentation/sections/unsupported_get_set.md
new file mode 100644
index 0000000000..d33f27ceff
--- /dev/null
+++ b/documentation/sections/unsupported_get_set.md
@@ -0,0 +1,9 @@
+### `get` and `set` keyword shorthand syntax
+
+`get` and `set`, as keywords preceding functions or class methods, are intentionally unimplemented in CoffeeScript.
+
+This is to avoid grammatical ambiguity, since in CoffeeScript such a construct looks identical to a function call (e.g. `get(function foo() {})`); and because there is an [alternate syntax](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty) that is slightly more verbose but just as effective:
+
+```
+codeFor('get_set', 'screen.height')
+```
diff --git a/documentation/sections/unsupported_let_const.md b/documentation/sections/unsupported_let_const.md
new file mode 100644
index 0000000000..63fc5f1e62
--- /dev/null
+++ b/documentation/sections/unsupported_let_const.md
@@ -0,0 +1,13 @@
+### `let` and `const`: block-scoped and reassignment-protected variables
+
+When CoffeeScript was designed, `var` was [intentionally omitted](https://github.com/jashkenas/coffeescript/issues/238#issuecomment-153502). This was to spare developers the mental housekeeping of needing to worry about variable _declaration_ (`var foo`) as opposed to variable _assignment_ (`foo = 1`). The CoffeeScript compiler automatically takes care of declaration for you, by generating `var` statements at the top of every function scope. This makes it impossible to accidentally declare a global variable.
+
+`let` and `const` add a useful ability to JavaScript in that you can use them to declare variables within a _block_ scope, for example within an `if` statement body or a `for` loop body, whereas `var` always declares variables in the scope of an entire function. When CoffeeScript 2 was designed, there was much discussion of whether this functionality was useful enough to outweigh the simplicity offered by never needing to consider variable declaration in CoffeeScript. In the end, it was decided that the simplicity was more valued. In CoffeeScript there remains only one type of variable.
+
+Keep in mind that `const` only protects you from _reassigning_ a variable; it doesn’t prevent the variable’s value from changing, the way constants usually do in other languages:
+
+```js
+const obj = {foo: 'bar'};
+obj.foo = 'baz'; // Allowed!
+obj = {}; // Throws error
+```
diff --git a/documentation/sections/unsupported_named_functions.md b/documentation/sections/unsupported_named_functions.md
new file mode 100644
index 0000000000..08f34f73cb
--- /dev/null
+++ b/documentation/sections/unsupported_named_functions.md
@@ -0,0 +1,5 @@
+### Named functions and function declarations
+
+Newcomers to CoffeeScript often wonder how to generate the JavaScript `function foo() {}`, as opposed to the `foo = function() {}` that CoffeeScript produces. The first form is a [function declaration](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function), and the second is a [function expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/function). As stated above, in CoffeeScript [everything is an expression](#expressions), so naturally we favor the expression form. Supporting only one variant helps avoid confusing bugs that can arise from the [subtle differences between the two forms](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function#Function_declaration_hoisting).
+
+Technically, `foo = function() {}` is creating an anonymous function that gets assigned to a variable named `foo`. Some very early versions of CoffeeScript named this function, e.g. `foo = function foo() {}`, but this was dropped because of compatibility issues with Internet Explorer. For a while this annoyed people, as these functions would be unnamed in stack traces; but modern JavaScript runtimes [infer the names of such anonymous functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/name) from the names of the variables to which they’re assigned. Given that this is the case, and given that not all functions in function expressions can be named (for example, the functions in `first.fn = ->; second.fn = ->` can’t both be named `fn`) it’s simplest to just preserve the current behavior.
diff --git a/documentation/sections/usage.md b/documentation/sections/usage.md
index 308bcf1a43..a6c991d49c 100644
--- a/documentation/sections/usage.md
+++ b/documentation/sections/usage.md
@@ -35,3 +35,43 @@ Once installed, you should have access to the `coffee` command, which can execut
     `coffee -o lib/ -cw src/`
 *   Start the CoffeeScript REPL (`Ctrl-D` to exit, `Ctrl-V`for multi-line):<br>
     `coffee`
+
+### ES2015+ Output
+
+CoffeeScript 2 outputs the latest ES2015+ syntax. If you’re looking for a single tool that takes CoffeeScript input and generates JavaScript output that runs in any JavaScript runtime, assuming you opt out of certain newer features, stick to [CoffeeScript 1.x](/v1/). CoffeeScript 2 [breaks compatibility](#breaking-changes) with certain CoffeeScript 1.x features in order to conform with the ES2015+ specifications, and generate more idiomatic output (a CoffeeScript `=>` becomes an ES `=>`; a CoffeeScript `class` becomes an ES `class`; and so on).
+
+Since the CoffeeScript 2 compiler outputs ES2015+ syntax, it is your responsibility to either ensure that your target JavaScript runtime(s) support all these features, or that you pass the output through another transpiler like [Babel](http://babeljs.io/), [Rollup](https://github.com/rollup/rollup) or [Traceur Compiler](https://github.com/google/traceur-compiler). In general, [CoffeeScript 2’s output is supported as is by Node.js 7.6+](http://node.green/), except for modules which require transpilation.
+
+There are many great task runners for setting up JavaScript build chains, such as [Gulp](http://gulpjs.com/), [Webpack](https://webpack.github.io/), [Grunt](https://gruntjs.com/) and [Broccoli](http://broccolijs.com/). If you’re looking for a very minimal solution to get started, you can use [babel-preset-env](https://babeljs.io/docs/plugins/preset-env/) and the command line:
+
+```bash
+npm install --global coffeescript@next
+npm install --save-dev coffeescript@next babel-cli babel-preset-env
+coffee -p *.coffee | babel --presets env > app.js
+```
+
+### Node.js
+
+If you’d like to use Node.js’ CommonJS to `require` CoffeeScript files, e.g. `require './app.coffee'`, you must first “register” CoffeeScript as an extension:
+
+```coffee
+require 'coffeescript/register'
+
+App = require './app' # The .coffee extension is optional
+```
+
+If you want to use the compiler’s API, for example to make an app that compiles strings of CoffeeScript on the fly, you can `require` the full module:
+
+```coffee
+CoffeeScript = require 'coffeescript'
+
+eval CoffeeScript.compile 'console.log "Mmmmm, I could really go for some #{Math.pi}"'
+```
+
+The `compile` method has the signature `compile(code, options)` where `code` is a string of CoffeeScript code, and the optional `options` is an object with some or all of the following properties:
+
+* `options.sourceMap`, boolean: if true, a source map will be generated; and instead of returning a string, `compile` will return an object of the form `{js, v3SourceMap, sourceMap}`.
+* `options.inlineMap`, boolean: if true, output the source map as a base64-encoded string in a comment at the bottom.
+* `options.filename`, string: the filename to use for the source map.
+* `options.bare`, boolean: if true, output without the [top-level function safety wrapper](#lexical-scope).
+* `options.header`, boolean: if true, output the `Generated by CoffeeScript` header.
diff --git a/documentation/v2/body.html b/documentation/v2/body.html
index 57a878dc66..bc7bbf87c0 100644
--- a/documentation/v2/body.html
+++ b/documentation/v2/body.html
@@ -64,11 +64,8 @@
         <section id="existential-operator">
           <%= htmlFor('existential_operator') %>
         </section>
-        <section id="classes">
-          <%= htmlFor('classes') %>
-        </section>
-        <section id="prototypal-inheritance">
-          <%= htmlFor('prototypal_inheritance') %>
+        <section id="chaining">
+          <%= htmlFor('chaining') %>
         </section>
         <section id="destructuring">
           <%= htmlFor('destructuring') %>
@@ -76,6 +73,18 @@
         <section id="fat-arrow">
           <%= htmlFor('fat_arrow') %>
         </section>
+        <section id="generators">
+          <%= htmlFor('generators') %>
+        </section>
+        <section id="async-functions">
+          <%= htmlFor('async_functions') %>
+        </section>
+        <section id="classes">
+          <%= htmlFor('classes') %>
+        </section>
+        <section id="prototypal-inheritance">
+          <%= htmlFor('prototypal_inheritance') %>
+        </section>
         <section id="switch">
           <%= htmlFor('switch') %>
         </section>
@@ -98,9 +107,6 @@
           <%= htmlFor('embedded') %>
         </section>
       </section>
-      <section id="unsupported">
-        <%= htmlFor('unsupported') %>
-      </section>
       <section id="literate">
         <%= htmlFor('literate') %>
       </section>
@@ -134,8 +140,35 @@
           <%= htmlFor('contributing') %>
         </section>
       </section>
+      <section id="unsupported">
+        <%= htmlFor('unsupported') %>
+        <section id="unsupported-let-const">
+          <%= htmlFor('unsupported_let_const') %>
+        </section>
+        <section id="unsupported-named-functions">
+          <%= htmlFor('unsupported_named_functions') %>
+        </section>
+        <section id="unsupported-get-set">
+          <%= htmlFor('unsupported_get_set') %>
+        </section>
+      </section>
       <section id="breaking-changes">
         <%= htmlFor('breaking_changes') %>
+        <section id="breaking-changes-default-values">
+          <%= htmlFor('breaking_changes_default_values') %>
+        </section>
+        <section id="breaking-changes-bound-generator-functions">
+          <%= htmlFor('breaking_changes_bound_generator_functions') %>
+        </section>
+        <section id="breaking-changes-classes">
+          <%= htmlFor('breaking_changes_classes') %>
+        </section>
+        <section id="breaking-changes-super-extends">
+          <%= htmlFor('breaking_changes_super_extends') %>
+        </section>
+        <section id="breaking-changes-literate-coffeescript">
+          <%= htmlFor('breaking_changes_literate_coffeescript') %>
+        </section>
       </section>
       <section id="changelog">
         <%= htmlFor('changelog') %>
diff --git a/documentation/v2/sidebar.html b/documentation/v2/sidebar.html
index f2d6fe0a27..ca3dd397f2 100644
--- a/documentation/v2/sidebar.html
+++ b/documentation/v2/sidebar.html
@@ -52,16 +52,25 @@
           <a href="#existential-operator" class="nav-link" data-action="sidebar-nav">Existential Operator</a>
         </li>
         <li class="nav-item">
-          <a href="#classes" class="nav-link" data-action="sidebar-nav">Classes</a>
+          <a href="#destructuring" class="nav-link" data-action="sidebar-nav">Destructuring Assignment</a>
         </li>
         <li class="nav-item">
-          <a href="#prototypal-inheritance" class="nav-link" data-action="sidebar-nav">Prototypal Inheritance</a>
+          <a href="#chaining" class="nav-link" data-action="sidebar-nav">Chaining Function Calls</a>
         </li>
         <li class="nav-item">
-          <a href="#destructuring" class="nav-link" data-action="sidebar-nav">Destructuring Assignment</a>
+          <a href="#fat-arrow" class="nav-link" data-action="sidebar-nav">Bound (Fat Arrow) Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#generators" class="nav-link" data-action="sidebar-nav">Generator Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#async-functions" class="nav-link" data-action="sidebar-nav">Async Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#classes" class="nav-link" data-action="sidebar-nav">Classes</a>
         </li>
         <li class="nav-item">
-          <a href="#fat-arrow" class="nav-link" data-action="sidebar-nav">Function Modifiers</a>
+          <a href="#prototypal-inheritance" class="nav-link" data-action="sidebar-nav">Prototypal Inheritance</a>
         </li>
         <li class="nav-item">
           <a href="#switch" class="nav-link" data-action="sidebar-nav">Switch and Try/Catch</a>
@@ -81,9 +90,6 @@
         <li class="nav-item">
           <a href="#embedded" class="nav-link" data-action="sidebar-nav">Embedded JavaScript</a>
         </li>
-        <li class="nav-item">
-          <a href="#unsupported" class="nav-link" data-action="sidebar-nav">Unsupported ECMAScript Features</a>
-        </li>
       </ul>
     </li>
     <li class="nav-item">
@@ -124,8 +130,39 @@
         </li>
       </ul>
     </li>
+    <li class="nav-item">
+      <a href="#unsupported" class="nav-link" data-action="sidebar-nav">Unsupported ECMAScript Features</a>
+      <ul class="nav">
+        <li class="nav-item">
+          <a href="#unsupported-let-const" class="nav-link" data-action="sidebar-nav"><code>let</code> and <code>const</code></a>
+        </li>
+        <li class="nav-item">
+          <a href="#unsupported-named-functions" class="nav-link" data-action="sidebar-nav">Named Functions and Function Declarations</a>
+        </li>
+        <li class="nav-item">
+          <a href="#unsupported-get-set" class="nav-link" data-action="sidebar-nav"><code>get</code> and <code>set</code> Shorthand Syntax</a>
+        </li>
+      </ul>
+    </li>
     <li class="nav-item">
       <a href="#breaking-changes" class="nav-link" data-action="sidebar-nav">Breaking Changes From 1.x</a>
+      <ul class="nav">
+        <li class="nav-item">
+          <a href="#breaking-changes-default-values" class="nav-link" data-action="sidebar-nav">Default Values</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-bound-generator-functions" class="nav-link" data-action="sidebar-nav">Bound Generator Functions</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-classes" class="nav-link" data-action="sidebar-nav">Classes</a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-super-extends" class="nav-link" data-action="sidebar-nav"><code>super</code> and <code>extends</code></a>
+        </li>
+        <li class="nav-item">
+          <a href="#breaking-changes-literate-coffeescript" class="nav-link" data-action="sidebar-nav">Literate CoffeeScript Parsing</a>
+        </li>
+      </ul>
     </li>
     <li class="nav-item">
       <a href="#changelog" class="nav-link" data-action="sidebar-nav">Change Log</a>