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20 lines
673 B
20 lines
673 B
var wellKnownSymbol = require('../internals/well-known-symbol'); |
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var create = require('../internals/object-create'); |
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var definePropertyModule = require('../internals/object-define-property'); |
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var UNSCOPABLES = wellKnownSymbol('unscopables'); |
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var ArrayPrototype = Array.prototype; |
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// Array.prototype[@@unscopables] |
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// https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables |
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if (ArrayPrototype[UNSCOPABLES] == undefined) { |
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definePropertyModule.f(ArrayPrototype, UNSCOPABLES, { |
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configurable: true, |
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value: create(null) |
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}); |
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} |
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// add a key to Array.prototype[@@unscopables] |
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module.exports = function (key) { |
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ArrayPrototype[UNSCOPABLES][key] = true; |
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};
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