43 lines
1.5 KiB
JavaScript
43 lines
1.5 KiB
JavaScript
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'use strict';
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var whichBoxedPrimitive = require('which-boxed-primitive');
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var callBound = require('call-bound');
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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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/** @type {import('.')} */
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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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// eslint-disable-next-line no-extra-parens
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return /** @type {Exclude<typeof symbolValueOf, false>} */ (symbolValueOf)(value);
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}
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if (which === 'BigInt') {
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// eslint-disable-next-line no-extra-parens
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return /** @type {Exclude<typeof bigIntValueOf, false>} */ (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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