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