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26 lines
697 B
26 lines
697 B
'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 = require('has-tostringtag/shams')(); |
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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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