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39 lines
1.3 KiB
39 lines
1.3 KiB
'use strict'; |
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var whichBoxedPrimitive = require('which-boxed-primitive'); |
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var callBound = require('call-bind/callBound'); |
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var hasSymbols = require('has-symbols')(); |
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var hasBigInts = require('has-bigints')(); |
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var stringToString = callBound('String.prototype.toString'); |
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var numberValueOf = callBound('Number.prototype.valueOf'); |
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var booleanValueOf = callBound('Boolean.prototype.valueOf'); |
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var symbolValueOf = hasSymbols && callBound('Symbol.prototype.valueOf'); |
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var bigIntValueOf = hasBigInts && callBound('BigInt.prototype.valueOf'); |
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module.exports = function unboxPrimitive(value) { |
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var which = whichBoxedPrimitive(value); |
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if (typeof which !== 'string') { |
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throw new TypeError(which === null ? 'value is an unboxed primitive' : 'value is a non-boxed-primitive object'); |
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} |
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if (which === 'String') { |
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return stringToString(value); |
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} |
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if (which === 'Number') { |
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return numberValueOf(value); |
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} |
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if (which === 'Boolean') { |
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return booleanValueOf(value); |
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} |
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if (which === 'Symbol') { |
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if (!hasSymbols) { |
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throw new EvalError('somehow this environment does not have Symbols, but you have a boxed Symbol value. Please report this!'); |
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} |
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return symbolValueOf(value); |
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} |
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if (which === 'BigInt') { |
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return bigIntValueOf(value); |
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} |
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throw new RangeError('unknown boxed primitive found: ' + which); |
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};
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