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<h1>_setup.js</h1>
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<p>Current version.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> <span class="hljs-variable constant_">VERSION</span> = <span class="hljs-string">'1.13.7'</span>;</pre></div></div>
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<p>Establish the root object, <code>window</code> (<code>self</code>) in the browser, <code>global</code>
on the server, or <code>this</code> in some virtual machines. We use <code>self</code>
instead of <code>window</code> for <code>WebWorker</code> support.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> root = (<span class="hljs-keyword">typeof</span> self == <span class="hljs-string">'object'</span> && self.<span class="hljs-property">self</span> === self && self) ||
(<span class="hljs-keyword">typeof</span> <span class="hljs-variable language_">global</span> == <span class="hljs-string">'object'</span> && <span class="hljs-variable language_">global</span>.<span class="hljs-property">global</span> === <span class="hljs-variable language_">global</span> && <span class="hljs-variable language_">global</span>) ||
<span class="hljs-title class_">Function</span>(<span class="hljs-string">'return this'</span>)() ||
{};</pre></div></div>
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<p>Save bytes in the minified (but not gzipped) version:</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> <span class="hljs-title class_">ArrayProto</span> = <span class="hljs-title class_">Array</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>, <span class="hljs-title class_">ObjProto</span> = <span class="hljs-title class_">Object</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>;
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> <span class="hljs-title class_">SymbolProto</span> = <span class="hljs-keyword">typeof</span> <span class="hljs-title class_">Symbol</span> !== <span class="hljs-string">'undefined'</span> ? <span class="hljs-title class_">Symbol</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span> : <span class="hljs-literal">null</span>;</pre></div></div>
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<p>Create quick reference variables for speed access to core prototypes.</p>
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<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> push = <span class="hljs-title class_">ArrayProto</span>.<span class="hljs-property">push</span>,
slice = <span class="hljs-title class_">ArrayProto</span>.<span class="hljs-property">slice</span>,
toString = <span class="hljs-title class_">ObjProto</span>.<span class="hljs-property">toString</span>,
hasOwnProperty = <span class="hljs-title class_">ObjProto</span>.<span class="hljs-property">hasOwnProperty</span>;</pre></div></div>
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<p>Modern feature detection.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> supportsArrayBuffer = <span class="hljs-keyword">typeof</span> <span class="hljs-title class_">ArrayBuffer</span> !== <span class="hljs-string">'undefined'</span>,
supportsDataView = <span class="hljs-keyword">typeof</span> <span class="hljs-title class_">DataView</span> !== <span class="hljs-string">'undefined'</span>;</pre></div></div>
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<p>All <strong>ECMAScript 5+</strong> native function implementations that we hope to use
are declared here.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> nativeIsArray = <span class="hljs-title class_">Array</span>.<span class="hljs-property">isArray</span>,
nativeKeys = <span class="hljs-title class_">Object</span>.<span class="hljs-property">keys</span>,
nativeCreate = <span class="hljs-title class_">Object</span>.<span class="hljs-property">create</span>,
nativeIsView = supportsArrayBuffer && <span class="hljs-title class_">ArrayBuffer</span>.<span class="hljs-property">isView</span>;</pre></div></div>
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<p>Create references to these builtin functions because we override them.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> _isNaN = <span class="hljs-built_in">isNaN</span>,
_isFinite = <span class="hljs-built_in">isFinite</span>;</pre></div></div>
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<p>Keys in IE < 9 that won’t be iterated by <code>for key in ...</code> and thus missed.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> hasEnumBug = !{<span class="hljs-attr">toString</span>: <span class="hljs-literal">null</span>}.<span class="hljs-title function_">propertyIsEnumerable</span>(<span class="hljs-string">'toString'</span>);
<span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> nonEnumerableProps = [<span class="hljs-string">'valueOf'</span>, <span class="hljs-string">'isPrototypeOf'</span>, <span class="hljs-string">'toString'</span>,
<span class="hljs-string">'propertyIsEnumerable'</span>, <span class="hljs-string">'hasOwnProperty'</span>, <span class="hljs-string">'toLocaleString'</span>];</pre></div></div>
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<p>The largest integer that can be represented exactly.</p>
</div>
<div class="content"><div class='highlight'><pre><span class="hljs-keyword">export</span> <span class="hljs-keyword">var</span> <span class="hljs-variable constant_">MAX_ARRAY_INDEX</span> = <span class="hljs-title class_">Math</span>.<span class="hljs-title function_">pow</span>(<span class="hljs-number">2</span>, <span class="hljs-number">53</span>) - <span class="hljs-number">1</span>;</pre></div></div>
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