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19 lines
673 B
19 lines
673 B
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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