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						- 'use strict';
 - 
 - var keys = require('object-keys');
 - var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
 - 
 - var toStr = Object.prototype.toString;
 - var concat = Array.prototype.concat;
 - var defineDataProperty = require('define-data-property');
 - 
 - var isFunction = function (fn) {
 - 	return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
 - };
 - 
 - var supportsDescriptors = require('has-property-descriptors')();
 - 
 - var defineProperty = function (object, name, value, predicate) {
 - 	if (name in object) {
 - 		if (predicate === true) {
 - 			if (object[name] === value) {
 - 				return;
 - 			}
 - 		} else if (!isFunction(predicate) || !predicate()) {
 - 			return;
 - 		}
 - 	}
 - 
 - 	if (supportsDescriptors) {
 - 		defineDataProperty(object, name, value, true);
 - 	} else {
 - 		defineDataProperty(object, name, value);
 - 	}
 - };
 - 
 - var defineProperties = function (object, map) {
 - 	var predicates = arguments.length > 2 ? arguments[2] : {};
 - 	var props = keys(map);
 - 	if (hasSymbols) {
 - 		props = concat.call(props, Object.getOwnPropertySymbols(map));
 - 	}
 - 	for (var i = 0; i < props.length; i += 1) {
 - 		defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
 - 	}
 - };
 - 
 - defineProperties.supportsDescriptors = !!supportsDescriptors;
 - 
 - module.exports = defineProperties;
 
 
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