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Support 'import.meta' #23327

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merged 16 commits into from
Apr 28, 2018
Merged

Support 'import.meta' #23327

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8923eec
Added tests for 'import.meta'.
DanielRosenwasser Apr 9, 2018
9b8670c
Accepted baselines.
DanielRosenwasser Apr 9, 2018
9e2bbb6
Basic parsing/emitting support for 'import.meta'.
DanielRosenwasser Apr 10, 2018
f0081f0
Basic checking for 'import.meta'.
DanielRosenwasser Apr 10, 2018
910c5d3
Accepted baselines.
DanielRosenwasser Apr 10, 2018
7c0f249
Added semicolon.
DanielRosenwasser Apr 10, 2018
56f4b2e
Provide an error when using 'import.meta' without setting 'esnext'.
DanielRosenwasser Apr 10, 2018
4f497e6
Added tests around ES5, assigning to 'import.meta' and properties, gl…
DanielRosenwasser Apr 10, 2018
1ea269a
Accepted baselines.
DanielRosenwasser Apr 10, 2018
0feefab
'modulekind' -> 'moduleKind'
DanielRosenwasser Apr 10, 2018
a55febd
Make 'ImportMeta' more minimal.
DanielRosenwasser Apr 24, 2018
28f8d75
Accepted baselines.
DanielRosenwasser Apr 24, 2018
9672116
Merge remote-tracking branch 'origin/master' into importDotMeta
DanielRosenwasser Apr 26, 2018
bc0d3e1
Look for top-level imports/exports before diving into the tree.
DanielRosenwasser Apr 28, 2018
161535b
Check for both 'module' and 'target'.
DanielRosenwasser Apr 28, 2018
12a3e39
Specify ESNext module in test.
DanielRosenwasser Apr 28, 2018
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58 changes: 46 additions & 12 deletions src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@ namespace ts {

const compilerOptions = host.getCompilerOptions();
const languageVersion = getEmitScriptTarget(compilerOptions);
const modulekind = getEmitModuleKind(compilerOptions);
const moduleKind = getEmitModuleKind(compilerOptions);
const allowSyntheticDefaultImports = getAllowSyntheticDefaultImports(compilerOptions);
const strictNullChecks = getStrictOptionValue(compilerOptions, "strictNullChecks");
const strictFunctionTypes = getStrictOptionValue(compilerOptions, "strictFunctionTypes");
Expand Down Expand Up @@ -443,6 +443,7 @@ namespace ts {
let deferredGlobalAsyncIteratorType: GenericType;
let deferredGlobalAsyncIterableIteratorType: GenericType;
let deferredGlobalTemplateStringsArrayType: ObjectType;
let deferredGlobalImportMetaType: ObjectType;
let deferredGlobalExtractSymbol: Symbol;

let deferredNodes: Node[];
Expand Down Expand Up @@ -1094,7 +1095,7 @@ namespace ts {
const declarationFile = getSourceFileOfNode(declaration);
const useFile = getSourceFileOfNode(usage);
if (declarationFile !== useFile) {
if ((modulekind && (declarationFile.externalModuleIndicator || useFile.externalModuleIndicator)) ||
if ((moduleKind && (declarationFile.externalModuleIndicator || useFile.externalModuleIndicator)) ||
(!compilerOptions.outFile && !compilerOptions.out) ||
isInTypeQuery(usage) ||
declaration.flags & NodeFlags.Ambient) {
Expand Down Expand Up @@ -7764,6 +7765,10 @@ namespace ts {
return deferredGlobalTemplateStringsArrayType || (deferredGlobalTemplateStringsArrayType = getGlobalType("TemplateStringsArray" as __String, /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
}

function getGlobalImportMetaType() {
return deferredGlobalImportMetaType || (deferredGlobalImportMetaType = getGlobalType("ImportMeta" as __String, /*arity*/ 0, /*reportErrors*/ true)) || emptyObjectType;
}

function getGlobalESSymbolConstructorSymbol(reportErrors: boolean) {
return deferredGlobalESSymbolConstructorSymbol || (deferredGlobalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol" as __String, reportErrors));
}
Expand Down Expand Up @@ -18780,6 +18785,17 @@ namespace ts {

function checkMetaProperty(node: MetaProperty) {
checkGrammarMetaProperty(node);

if (node.keywordToken === SyntaxKind.NewKeyword) {
return checkNewTargetMetaProperty(node);
}

if (node.keywordToken === SyntaxKind.ImportKeyword) {
return checkImportMetaProperty(node);
}
}

function checkNewTargetMetaProperty(node: MetaProperty) {
const container = getNewTargetContainer(node);
if (!container) {
error(node, Diagnostics.Meta_property_0_is_only_allowed_in_the_body_of_a_function_declaration_function_expression_or_constructor, "new.target");
Expand All @@ -18795,6 +18811,16 @@ namespace ts {
}
}

function checkImportMetaProperty(node: MetaProperty) {
if (languageVersion < ScriptTarget.ESNext || moduleKind < ModuleKind.ESNext) {
error(node, Diagnostics.The_import_meta_meta_property_is_only_allowed_using_ESNext_for_the_target_and_module_compiler_options);
}
const file = getSourceFileOfNode(node);
Debug.assert(!!(file.flags & NodeFlags.PossiblyContainsImportMeta), "Containing file is missing import meta node flag.");
Debug.assert(!!file.externalModuleIndicator, "Containing file should be a module.");
return node.name.escapedText === "meta" ? getGlobalImportMetaType() : unknownType;
}

function getTypeOfParameter(symbol: Symbol) {
const type = getTypeOfSymbol(symbol);
if (strictNullChecks) {
Expand Down Expand Up @@ -22417,7 +22443,7 @@ namespace ts {

function checkCollisionWithRequireExportsInGeneratedCode(node: Node, name: Identifier) {
// No need to check for require or exports for ES6 modules and later
if (modulekind >= ModuleKind.ES2015 || compilerOptions.noEmit) {
if (moduleKind >= ModuleKind.ES2015 || compilerOptions.noEmit) {
return;
}

Expand Down Expand Up @@ -24613,7 +24639,7 @@ namespace ts {
}
}
else {
if (modulekind >= ModuleKind.ES2015 && !(node.flags & NodeFlags.Ambient)) {
if (moduleKind >= ModuleKind.ES2015 && !(node.flags & NodeFlags.Ambient)) {
// Import equals declaration is deprecated in es6 or above
grammarErrorOnNode(node, Diagnostics.Import_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_import_Asterisk_as_ns_from_mod_import_a_from_mod_import_d_from_mod_or_another_module_format_instead);
}
Expand Down Expand Up @@ -24651,7 +24677,7 @@ namespace ts {
error(node.moduleSpecifier, Diagnostics.Module_0_uses_export_and_cannot_be_used_with_export_Asterisk, symbolToString(moduleSymbol));
}

if (modulekind !== ModuleKind.System && modulekind !== ModuleKind.ES2015 && modulekind !== ModuleKind.ESNext) {
if (moduleKind !== ModuleKind.System && moduleKind !== ModuleKind.ES2015 && moduleKind !== ModuleKind.ESNext) {
checkExternalEmitHelpers(node, ExternalEmitHelpers.ExportStar);
}
}
Expand Down Expand Up @@ -24724,11 +24750,11 @@ namespace ts {
}

if (node.isExportEquals && !(node.flags & NodeFlags.Ambient)) {
if (modulekind >= ModuleKind.ES2015) {
if (moduleKind >= ModuleKind.ES2015) {
// export assignment is not supported in es6 modules
grammarErrorOnNode(node, Diagnostics.Export_assignment_cannot_be_used_when_targeting_ECMAScript_modules_Consider_using_export_default_or_another_module_format_instead);
}
else if (modulekind === ModuleKind.System) {
else if (moduleKind === ModuleKind.System) {
// system modules does not support export assignment
grammarErrorOnNode(node, Diagnostics.Export_assignment_is_not_supported_when_module_flag_is_system);
}
Expand Down Expand Up @@ -27676,10 +27702,18 @@ namespace ts {
}

function checkGrammarMetaProperty(node: MetaProperty) {
if (node.keywordToken === SyntaxKind.NewKeyword) {
if (node.name.escapedText !== "target") {
return grammarErrorOnNode(node.name, Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, tokenToString(node.keywordToken), "target");
}
const escapedText = node.name.escapedText;
switch (node.keywordToken) {
case SyntaxKind.NewKeyword:
if (escapedText !== "target") {
return grammarErrorOnNode(node.name, Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, tokenToString(node.keywordToken), "target");
}
break;
case SyntaxKind.ImportKeyword:
if (escapedText !== "meta") {
return grammarErrorOnNode(node.name, Diagnostics._0_is_not_a_valid_meta_property_for_keyword_1_Did_you_mean_2, node.name.escapedText, tokenToString(node.keywordToken), "meta");
}
break;
}
}

Expand Down Expand Up @@ -27878,7 +27912,7 @@ namespace ts {
}

function checkGrammarImportCallExpression(node: ImportCall): boolean {
if (modulekind === ModuleKind.ES2015) {
if (moduleKind === ModuleKind.ES2015) {
return grammarErrorOnNode(node, Diagnostics.Dynamic_import_cannot_be_used_when_targeting_ECMAScript_2015_modules);
}

Expand Down
4 changes: 4 additions & 0 deletions src/compiler/diagnosticMessages.json
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Original file line number Diff line number Diff line change
Expand Up @@ -971,6 +971,10 @@
"category": "Error",
"code": 1342
},
"The 'import.meta' meta-property is only allowed using 'ESNext' for the 'target' and 'module' compiler options.": {
"category": "Error",
"code": 1343
},

"Duplicate identifier '{0}'.": {
"category": "Error",
Expand Down
92 changes: 72 additions & 20 deletions src/compiler/parser.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -540,7 +540,7 @@ namespace ts {
const newSourceFile = IncrementalParser.updateSourceFile(sourceFile, newText, textChangeRange, aggressiveChecks);
// Because new source file node is created, it may not have the flag PossiblyContainDynamicImport. This is the case if there is no new edit to add dynamic import.
// We will manually port the flag to the new source file.
newSourceFile.flags |= (sourceFile.flags & NodeFlags.PossiblyContainsDynamicImport);
newSourceFile.flags |= (sourceFile.flags & NodeFlags.PermanentlySetIncrementalFlags);
return newSourceFile;
}

Expand Down Expand Up @@ -2625,6 +2625,20 @@ namespace ts {
return token() === SyntaxKind.OpenParenToken || token() === SyntaxKind.LessThanToken;
}

function nextTokenIsDot() {
return nextToken() === SyntaxKind.DotToken;
}

function nextTokenIsOpenParenOrLessThanOrDot() {
switch (nextToken()) {
case SyntaxKind.OpenParenToken:
case SyntaxKind.LessThanToken:
case SyntaxKind.DotToken:
return true;
}
return false;
}

function parseTypeLiteral(): TypeLiteralNode {
const node = <TypeLiteralNode>createNode(SyntaxKind.TypeLiteral);
node.members = parseObjectTypeMembers();
Expand Down Expand Up @@ -3093,7 +3107,7 @@ namespace ts {
case SyntaxKind.Identifier:
return true;
case SyntaxKind.ImportKeyword:
return lookAhead(nextTokenIsOpenParenOrLessThan);
return lookAhead(nextTokenIsOpenParenOrLessThanOrDot);
default:
return isIdentifier();
}
Expand Down Expand Up @@ -3955,14 +3969,31 @@ namespace ts {
// 3)we have a MemberExpression which either completes the LeftHandSideExpression,
// or starts the beginning of the first four CallExpression productions.
let expression: MemberExpression;
if (token() === SyntaxKind.ImportKeyword && lookAhead(nextTokenIsOpenParenOrLessThan)) {
// We don't want to eagerly consume all import keyword as import call expression so we look a head to find "("
// For example:
// var foo3 = require("subfolder
// import * as foo1 from "module-from-node
// We want this import to be a statement rather than import call expression
sourceFile.flags |= NodeFlags.PossiblyContainsDynamicImport;
expression = parseTokenNode<PrimaryExpression>();
if (token() === SyntaxKind.ImportKeyword) {
if (lookAhead(nextTokenIsOpenParenOrLessThan)) {
// We don't want to eagerly consume all import keyword as import call expression so we look ahead to find "("
// For example:
// var foo3 = require("subfolder
// import * as foo1 from "module-from-node
// We want this import to be a statement rather than import call expression
sourceFile.flags |= NodeFlags.PossiblyContainsDynamicImport;
expression = parseTokenNode<PrimaryExpression>();
}
else if (lookAhead(nextTokenIsDot)) {
// This is an 'import.*' metaproperty (i.e. 'import.meta')
const fullStart = scanner.getStartPos();
nextToken(); // advance past the 'import'
nextToken(); // advance past the dot
const node = createNode(SyntaxKind.MetaProperty, fullStart) as MetaProperty;
node.keywordToken = SyntaxKind.ImportKeyword;
node.name = parseIdentifierName();
expression = finishNode(node);

sourceFile.flags |= NodeFlags.PossiblyContainsImportMeta;
}
else {
expression = parseMemberExpressionOrHigher();
}
}
else {
expression = token() === SyntaxKind.SuperKeyword ? parseSuperExpression() : parseMemberExpressionOrHigher();
Expand Down Expand Up @@ -4523,7 +4554,7 @@ namespace ts {
case SyntaxKind.FunctionKeyword:
return parseFunctionExpression();
case SyntaxKind.NewKeyword:
return parseNewExpression();
return parseNewExpressionOrNewDotTarget();
case SyntaxKind.SlashToken:
case SyntaxKind.SlashEqualsToken:
if (reScanSlashToken() === SyntaxKind.RegularExpressionLiteral) {
Expand Down Expand Up @@ -4674,7 +4705,7 @@ namespace ts {
return isIdentifier() ? parseIdentifier() : undefined;
}

function parseNewExpression(): NewExpression | MetaProperty {
function parseNewExpressionOrNewDotTarget(): NewExpression | MetaProperty {
const fullStart = scanner.getStartPos();
parseExpected(SyntaxKind.NewKeyword);
if (parseOptional(SyntaxKind.DotToken)) {
Expand Down Expand Up @@ -5122,7 +5153,7 @@ namespace ts {
return true;

case SyntaxKind.ImportKeyword:
return isStartOfDeclaration() || lookAhead(nextTokenIsOpenParenOrLessThan);
return isStartOfDeclaration() || lookAhead(nextTokenIsOpenParenOrLessThanOrDot);

case SyntaxKind.ConstKeyword:
case SyntaxKind.ExportKeyword:
Expand Down Expand Up @@ -6108,14 +6139,35 @@ namespace ts {
}

function setExternalModuleIndicator(sourceFile: SourceFile) {
sourceFile.externalModuleIndicator = forEach(sourceFile.statements, node =>
hasModifier(node, ModifierFlags.Export)
|| node.kind === SyntaxKind.ImportEqualsDeclaration && (<ImportEqualsDeclaration>node).moduleReference.kind === SyntaxKind.ExternalModuleReference
|| node.kind === SyntaxKind.ImportDeclaration
|| node.kind === SyntaxKind.ExportAssignment
|| node.kind === SyntaxKind.ExportDeclaration
// Try to use the first top-level import/export when available, then
// fall back to looking for an 'import.meta' somewhere in the tree if necessary.
sourceFile.externalModuleIndicator =
forEach(sourceFile.statements, isAnExternalModuleIndicatorNode) ||
getImportMetaIfNecessary(sourceFile);
}

function isAnExternalModuleIndicatorNode(node: Node) {
return hasModifier(node, ModifierFlags.Export)
|| node.kind === SyntaxKind.ImportEqualsDeclaration && (<ImportEqualsDeclaration>node).moduleReference.kind === SyntaxKind.ExternalModuleReference
|| node.kind === SyntaxKind.ImportDeclaration
|| node.kind === SyntaxKind.ExportAssignment
|| node.kind === SyntaxKind.ExportDeclaration
? node
: undefined);
: undefined;
}

function getImportMetaIfNecessary(sourceFile: SourceFile) {
return sourceFile.flags & NodeFlags.PossiblyContainsImportMeta ?
walkTreeForExternalModuleIndicators(sourceFile) :
undefined;
}

function walkTreeForExternalModuleIndicators(node: Node): Node {
return isImportMeta(node) ? node : forEachChild(node, walkTreeForExternalModuleIndicators);
}

function isImportMeta(node: Node): boolean {
return isMetaProperty(node) && node.keywordToken === SyntaxKind.ImportKeyword && node.name.escapedText === "meta";
}

const enum ParsingContext {
Expand Down
2 changes: 1 addition & 1 deletion src/compiler/program.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -986,7 +986,7 @@ namespace ts {
// moduleAugmentations has changed
oldProgram.structureIsReused = StructureIsReused.SafeModules;
}
if ((oldSourceFile.flags & NodeFlags.PossiblyContainsDynamicImport) !== (newSourceFile.flags & NodeFlags.PossiblyContainsDynamicImport)) {
if ((oldSourceFile.flags & NodeFlags.PermanentlySetIncrementalFlags) !== (newSourceFile.flags & NodeFlags.PermanentlySetIncrementalFlags)) {
// dynamicImport has changed
oldProgram.structureIsReused = StructureIsReused.SafeModules;
}
Expand Down
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