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24 lines
1.0 KiB
24 lines
1.0 KiB
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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