forked from projectmoon/tenebrous-dicebot
27 lines
715 B
JavaScript
27 lines
715 B
JavaScript
'use strict';
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var callBound = require('call-bind/callBound');
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var $boolToStr = callBound('Boolean.prototype.toString');
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var $toString = callBound('Object.prototype.toString');
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var tryBooleanObject = function booleanBrandCheck(value) {
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try {
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$boolToStr(value);
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return true;
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} catch (e) {
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return false;
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}
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};
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var boolClass = '[object Boolean]';
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var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag;
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module.exports = function isBoolean(value) {
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if (typeof value === 'boolean') {
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return true;
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}
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if (value === null || typeof value !== 'object') {
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return false;
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}
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return hasToStringTag && Symbol.toStringTag in value ? tryBooleanObject(value) : $toString(value) === boolClass;
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};
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