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25 lines
1.0 KiB
25 lines
1.0 KiB
3 years ago
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var global = require('../internals/global');
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var shared = require('../internals/shared');
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var hasOwn = require('../internals/has-own-property');
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var uid = require('../internals/uid');
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var NATIVE_SYMBOL = require('../internals/native-symbol');
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var USE_SYMBOL_AS_UID = require('../internals/use-symbol-as-uid');
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var WellKnownSymbolsStore = shared('wks');
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var Symbol = global.Symbol;
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var symbolFor = Symbol && Symbol['for'];
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var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol : Symbol && Symbol.withoutSetter || uid;
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module.exports = function (name) {
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if (!hasOwn(WellKnownSymbolsStore, name) || !(NATIVE_SYMBOL || typeof WellKnownSymbolsStore[name] == 'string')) {
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var description = 'Symbol.' + name;
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if (NATIVE_SYMBOL && hasOwn(Symbol, name)) {
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WellKnownSymbolsStore[name] = Symbol[name];
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} else if (USE_SYMBOL_AS_UID && symbolFor) {
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WellKnownSymbolsStore[name] = symbolFor(description);
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} else {
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WellKnownSymbolsStore[name] = createWellKnownSymbol(description);
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}
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} return WellKnownSymbolsStore[name];
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};
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