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43 lines
1.2 KiB
43 lines
1.2 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var callBound = require('call-bind/callBound'); |
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var $SyntaxError = GetIntrinsic('%SyntaxError%'); |
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var getGlobalSymbolDescription = GetIntrinsic('%Symbol.keyFor%', true); |
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var thisSymbolValue = callBound('%Symbol.prototype.valueOf%', true); |
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var symToStr = callBound('Symbol.prototype.toString', true); |
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var getInferredName = require('./getInferredName'); |
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/* eslint-disable consistent-return */ |
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module.exports = callBound('%Symbol.prototype.description%', true) || function getSymbolDescription(symbol) { |
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if (!thisSymbolValue) { |
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throw new $SyntaxError('Symbols are not supported in this environment'); |
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} |
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// will throw if not a symbol primitive or wrapper object |
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var sym = thisSymbolValue(symbol); |
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if (getInferredName) { |
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var name = getInferredName(sym); |
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if (name === '') { |
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return; |
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} |
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return name.slice(1, -1); // name.slice('['.length, -']'.length); |
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} |
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var desc; |
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if (getGlobalSymbolDescription) { |
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desc = getGlobalSymbolDescription(sym); |
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if (typeof desc === 'string') { |
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return desc; |
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} |
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} |
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desc = symToStr(sym).slice(7, -1); // str.slice('Symbol('.length, -')'.length); |
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if (desc) { |
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return desc; |
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} |
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};
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