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26 lines
659 B
26 lines
659 B
'use strict';
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var boolToStr = Boolean.prototype.toString;
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var tryBooleanObject = function booleanBrandCheck(value) {
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try {
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boolToStr.call(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 toStr = Object.prototype.toString;
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var boolClass = '[object Boolean]';
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var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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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) : toStr.call(value) === boolClass;
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};
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