1
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'use strict';
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2
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3
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var keys = require('object-keys');
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4
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
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5
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6
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var toStr = Object.prototype.toString;
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7
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var concat = Array.prototype.concat;
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8
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var origDefineProperty = Object.defineProperty;
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9
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10
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var isFunction = function (fn) {
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11
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return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
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12
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};
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13
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14
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var arePropertyDescriptorsSupported = function () {
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15
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var obj = {};
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16
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try {
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17
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origDefineProperty(obj, 'x', { enumerable: false, value: obj });
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18
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// eslint-disable-next-line no-unused-vars, no-restricted-syntax
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19
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for (var _ in obj) { // jscs:ignore disallowUnusedVariables
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20
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return false;
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21
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}
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22
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return obj.x === obj;
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23
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} catch (e) { /* this is IE 8. */
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24
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return false;
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25
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}
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26
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};
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27
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var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
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28
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29
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var defineProperty = function (object, name, value, predicate) {
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30
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if (name in object && (!isFunction(predicate) || !predicate())) {
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31
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return;
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32
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}
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33
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if (supportsDescriptors) {
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34
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origDefineProperty(object, name, {
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35
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configurable: true,
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36
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enumerable: false,
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37
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value: value,
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38
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writable: true
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39
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});
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40
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} else {
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41
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object[name] = value;
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42
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}
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43
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};
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44
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45
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var defineProperties = function (object, map) {
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46
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var predicates = arguments.length > 2 ? arguments[2] : {};
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47
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var props = keys(map);
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48
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if (hasSymbols) {
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49
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props = concat.call(props, Object.getOwnPropertySymbols(map));
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50
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}
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51
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for (var i = 0; i < props.length; i += 1) {
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52
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defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
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53
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}
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54
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};
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55
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56
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defineProperties.supportsDescriptors = !!supportsDescriptors;
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57
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58
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module.exports = defineProperties;
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