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musix-oss/node_modules/core-js/internals/array-method-has-species-support.js

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2020-03-03 20:30:50 +00:00
var fails = require('../internals/fails');
var wellKnownSymbol = require('../internals/well-known-symbol');
var V8_VERSION = require('../internals/engine-v8-version');
var SPECIES = wellKnownSymbol('species');
module.exports = function (METHOD_NAME) {
// We can't use this feature detection in V8 since it causes
// deoptimization and serious performance degradation
// https://github.com/zloirock/core-js/issues/677
return V8_VERSION >= 51 || !fails(function () {
var array = [];
var constructor = array.constructor = {};
constructor[SPECIES] = function () {
return { foo: 1 };
};
return array[METHOD_NAME](Boolean).foo !== 1;
});
};