tti-polyfill.js

// From: https://github.com/GoogleChromeLabs/tti-polyfill/blob/master/tti-polyfill.js
(function(){var h="undefined"!=typeof window&&window===this?this:"undefined"!=typeof global&&null!=global?global:this,k="function"==typeof Object.defineProperties?Object.defineProperty:function(a,b,c){a!=Array.prototype&&a!=Object.prototype&&(a[b]=c.value)};function l(){l=function(){};h.Symbol||(h.Symbol=m)}var n=0;function m(a){return"jscomp_symbol_"+(a||"")+n++}
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    function x(a,b){var c=fetch;fetch=function(d){for(var f=[],e=0;e<arguments.length;++e)f[e-0]=arguments[e];return new Promise(function(d,e){var g=v++;a(g);c.apply(null,[].concat(u(f))).then(function(a){b(g);d(a)},function(a){b(a);e(a)})})}}var y="img script iframe link audio video source".split(" ");function z(a,b){a=t(a);for(var c=a.next();!c.done;c=a.next())if(c=c.value,b.includes(c.nodeName.toLowerCase())||z(c.children,b))return!0;return!1}
    function A(a){var b=new MutationObserver(function(c){c=t(c);for(var b=c.next();!b.done;b=c.next())b=b.value,"childList"==b.type&&z(b.addedNodes,y)?a(b):"attributes"==b.type&&y.includes(b.target.tagName.toLowerCase())&&a(b)});b.observe(document,{attributes:!0,childList:!0,subtree:!0,attributeFilter:["href","src"]});return b}
    function B(a,b){if(2<a.length)return performance.now();var c=[];b=t(b);for(var d=b.next();!d.done;d=b.next())d=d.value,c.push({timestamp:d.start,type:"requestStart"}),c.push({timestamp:d.end,type:"requestEnd"});b=t(a);for(d=b.next();!d.done;d=b.next())c.push({timestamp:d.value,type:"requestStart"});c.sort(function(a,b){return a.timestamp-b.timestamp});a=a.length;for(b=c.length-1;0<=b;b--)switch(d=c[b],d.type){case "requestStart":a--;break;case "requestEnd":a++;if(2<a)return d.timestamp;break;default:throw Error("Internal Error: This should never happen");
    }return 0}function C(a){a=a?a:{};this.w=!!a.useMutationObserver;this.u=a.minValue||null;a=window.__tti&&window.__tti.e;var b=window.__tti&&window.__tti.o;this.a=a?a.map(function(a){return{start:a.startTime,end:a.startTime+a.duration}}):[];b&&b.disconnect();this.b=[];this.f=new Map;this.j=null;this.v=-Infinity;this.i=!1;this.h=this.c=this.s=null;w(this.m.bind(this),this.l.bind(this));x(this.m.bind(this),this.l.bind(this));D(this);this.w&&(this.h=A(this.B.bind(this)))}
    C.prototype.getFirstConsistentlyInteractive=function(){var a=this;return new Promise(function(b){a.s=b;"complete"==document.readyState?F(a):window.addEventListener("load",function(){F(a)})})};function F(a){a.i=!0;var b=0<a.a.length?a.a[a.a.length-1].end:0,c=B(a.g,a.b);G(a,Math.max(c+5E3,b))}
    function G(a,b){!a.i||a.v>b||(clearTimeout(a.j),a.j=setTimeout(function(){var b=performance.timing.navigationStart,d=B(a.g,a.b),b=(window.a&&window.a.A?1E3*window.a.A().C-b:0)||performance.timing.domContentLoadedEventEnd-b;if(a.u)var f=a.u;else performance.timing.domContentLoadedEventEnd?(f=performance.timing,f=f.domContentLoadedEventEnd-f.navigationStart):f=null;var e=performance.now();null===f&&G(a,Math.max(d+5E3,e+1E3));var g=a.a;5E3>e-d?d=null:(d=g.length?g[g.length-1].end:b,d=5E3>e-d?null:Math.max(d,
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    C.prototype.B=function(){G(this,performance.now()+5E3)};h.Object.defineProperties(C.prototype,{g:{configurable:!0,enumerable:!0,get:function(){return[].concat(u(this.f.values()))}}});var H={getFirstConsistentlyInteractive:function(a){a=a?a:{};return"PerformanceLongTaskTiming"in window?(new C(a)).getFirstConsistentlyInteractive():Promise.resolve(null)}};
    "undefined"!=typeof module&&module.exports?module.exports=H:"function"===typeof define&&define.amd?define("ttiPolyfill",[],function(){return H}):window.ttiPolyfill=H;})();