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24 lines
739 B
24 lines
739 B
var DESCRIPTORS = require('../internals/descriptors');
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var FUNCTION_NAME_EXISTS = require('../internals/function-name').EXISTS;
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var defineProperty = require('../internals/object-define-property').f;
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var FunctionPrototype = Function.prototype;
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var FunctionPrototypeToString = FunctionPrototype.toString;
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var nameRE = /^\s*function ([^ (]*)/;
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var NAME = 'name';
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// Function instances `.name` property
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// https://tc39.es/ecma262/#sec-function-instances-name
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if (DESCRIPTORS && !FUNCTION_NAME_EXISTS) {
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defineProperty(FunctionPrototype, NAME, {
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configurable: true,
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get: function () {
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try {
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return FunctionPrototypeToString.call(this).match(nameRE)[1];
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} catch (error) {
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return '';
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}
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}
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});
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}
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