| Tim van der Lippe | 2c89197 | 2021-07-29 16:22:50 +0100 | [diff] [blame] | 1 | 'use strict'; |
| 2 | |
| 3 | var callBound = require('call-bind/callBound'); |
| 4 | var $boolToStr = callBound('Boolean.prototype.toString'); |
| 5 | var $toString = callBound('Object.prototype.toString'); |
| 6 | |
| 7 | var tryBooleanObject = function booleanBrandCheck(value) { |
| 8 | try { |
| 9 | $boolToStr(value); |
| 10 | return true; |
| 11 | } catch (e) { |
| 12 | return false; |
| 13 | } |
| 14 | }; |
| 15 | var boolClass = '[object Boolean]'; |
| Tim van der Lippe | bc3a0b7 | 2021-11-08 15:22:37 +0000 | [diff] [blame] | 16 | var hasToStringTag = require('has-tostringtag/shams')(); |
| Tim van der Lippe | 2c89197 | 2021-07-29 16:22:50 +0100 | [diff] [blame] | 17 | |
| 18 | module.exports = function isBoolean(value) { |
| 19 | if (typeof value === 'boolean') { |
| 20 | return true; |
| 21 | } |
| 22 | if (value === null || typeof value !== 'object') { |
| 23 | return false; |
| 24 | } |
| 25 | return hasToStringTag && Symbol.toStringTag in value ? tryBooleanObject(value) : $toString(value) === boolClass; |
| 26 | }; |