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44 lines
1.2 KiB
44 lines
1.2 KiB
4 years ago
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'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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