21 lines
687 B
JavaScript
21 lines
687 B
JavaScript
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'use strict';
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var fails = require('../internals/fails');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var V8_VERSION = require('../internals/engine-v8-version');
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var SPECIES = wellKnownSymbol('species');
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module.exports = function (METHOD_NAME) {
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// We can't use this feature detection in V8 since it causes
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// deoptimization and serious performance degradation
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// https://github.com/zloirock/core-js/issues/677
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return V8_VERSION >= 51 || !fails(function () {
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var array = [];
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var constructor = array.constructor = {};
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constructor[SPECIES] = function () {
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return { foo: 1 };
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};
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return array[METHOD_NAME](Boolean).foo !== 1;
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});
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};
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