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							29 lines
						
					
					
						
							1.3 KiB
						
					
					
				
			
		
		
	
	
							29 lines
						
					
					
						
							1.3 KiB
						
					
					
				var $ = require('../internals/export'); | 
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var uncurryThis = require('../internals/function-uncurry-this'); | 
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var $isCallable = require('../internals/is-callable'); | 
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var inspectSource = require('../internals/inspect-source'); | 
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var hasOwn = require('../internals/has-own-property'); | 
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var DESCRIPTORS = require('../internals/descriptors'); | 
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 | 
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// eslint-disable-next-line es-x/no-object-getownpropertydescriptor -- safe | 
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var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor; | 
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var classRegExp = /^\s*class\b/; | 
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var exec = uncurryThis(classRegExp.exec); | 
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 | 
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var isClassConstructor = function (argument) { | 
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  try { | 
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    // `Function#toString` throws on some built-it function in some legacy engines | 
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    // (for example, `DOMQuad` and similar in FF41-) | 
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    if (!DESCRIPTORS || !exec(classRegExp, inspectSource(argument))) return false; | 
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  } catch (error) { /* empty */ } | 
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  var prototype = getOwnPropertyDescriptor(argument, 'prototype'); | 
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  return !!prototype && hasOwn(prototype, 'writable') && !prototype.writable; | 
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}; | 
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 | 
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// `Function.isCallable` method | 
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// https://github.com/caitp/TC39-Proposals/blob/trunk/tc39-reflect-isconstructor-iscallable.md | 
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$({ target: 'Function', stat: true, sham: true, forced: true }, { | 
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  isCallable: function isCallable(argument) { | 
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    return $isCallable(argument) && !isClassConstructor(argument); | 
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  } | 
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});
 | 
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