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							58 lines
						
					
					
						
							1.6 KiB
						
					
					
				
			
		
		
	
	
							58 lines
						
					
					
						
							1.6 KiB
						
					
					
				'use strict'; | 
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var keys = require('object-keys'); | 
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol'; | 
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var toStr = Object.prototype.toString; | 
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var concat = Array.prototype.concat; | 
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var origDefineProperty = Object.defineProperty; | 
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var isFunction = function (fn) { | 
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	return typeof fn === 'function' && toStr.call(fn) === '[object Function]'; | 
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}; | 
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var arePropertyDescriptorsSupported = function () { | 
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	var obj = {}; | 
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	try { | 
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		origDefineProperty(obj, 'x', { enumerable: false, value: obj }); | 
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		// eslint-disable-next-line no-unused-vars, no-restricted-syntax | 
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		for (var _ in obj) { // jscs:ignore disallowUnusedVariables | 
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			return false; | 
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		} | 
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		return obj.x === obj; | 
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	} catch (e) { /* this is IE 8. */ | 
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		return false; | 
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	} | 
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}; | 
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var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported(); | 
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var defineProperty = function (object, name, value, predicate) { | 
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	if (name in object && (!isFunction(predicate) || !predicate())) { | 
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		return; | 
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	} | 
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	if (supportsDescriptors) { | 
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		origDefineProperty(object, name, { | 
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			configurable: true, | 
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			enumerable: false, | 
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			value: value, | 
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			writable: true | 
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		}); | 
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	} else { | 
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		object[name] = value; | 
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	} | 
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}; | 
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var defineProperties = function (object, map) { | 
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	var predicates = arguments.length > 2 ? arguments[2] : {}; | 
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	var props = keys(map); | 
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	if (hasSymbols) { | 
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		props = concat.call(props, Object.getOwnPropertySymbols(map)); | 
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	} | 
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	for (var i = 0; i < props.length; i += 1) { | 
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		defineProperty(object, props[i], map[props[i]], predicates[props[i]]); | 
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	} | 
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}; | 
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defineProperties.supportsDescriptors = !!supportsDescriptors; | 
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module.exports = defineProperties;
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