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20 lines
841 B
20 lines
841 B
var call = require('../internals/function-call'); |
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var getBuiltIn = require('../internals/get-built-in'); |
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var wellKnownSymbol = require('../internals/well-known-symbol'); |
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var defineBuiltIn = require('../internals/define-built-in'); |
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module.exports = function () { |
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var Symbol = getBuiltIn('Symbol'); |
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var SymbolPrototype = Symbol && Symbol.prototype; |
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var valueOf = SymbolPrototype && SymbolPrototype.valueOf; |
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var TO_PRIMITIVE = wellKnownSymbol('toPrimitive'); |
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if (SymbolPrototype && !SymbolPrototype[TO_PRIMITIVE]) { |
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// `Symbol.prototype[@@toPrimitive]` method |
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// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive |
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// eslint-disable-next-line no-unused-vars -- required for .length |
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defineBuiltIn(SymbolPrototype, TO_PRIMITIVE, function (hint) { |
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return call(valueOf, this); |
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}, { arity: 1 }); |
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} |
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};
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