1 | 'use strict';
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2 |
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3 | var keys = require('object-keys');
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4 | var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
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5 |
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6 | var toStr = Object.prototype.toString;
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7 | var concat = Array.prototype.concat;
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8 | var origDefineProperty = Object.defineProperty;
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9 |
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10 | var isFunction = function (fn) {
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11 | return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
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12 | };
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13 |
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14 | var arePropertyDescriptorsSupported = function () {
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15 | var obj = {};
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16 | try {
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17 | origDefineProperty(obj, 'x', { enumerable: false, value: obj });
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18 |
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19 | for (var _ in obj) {
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20 | return false;
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21 | }
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22 | return obj.x === obj;
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23 | } catch (e) {
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24 | return false;
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25 | }
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26 | };
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27 | var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
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28 |
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29 | var defineProperty = function (object, name, value, predicate) {
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30 | if (name in object && (!isFunction(predicate) || !predicate())) {
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31 | return;
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32 | }
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33 | if (supportsDescriptors) {
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34 | origDefineProperty(object, name, {
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35 | configurable: true,
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36 | enumerable: false,
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37 | value: value,
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38 | writable: true
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39 | });
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40 | } else {
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41 | object[name] = value;
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42 | }
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43 | };
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44 |
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45 | var defineProperties = function (object, map) {
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46 | var predicates = arguments.length > 2 ? arguments[2] : {};
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47 | var props = keys(map);
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48 | if (hasSymbols) {
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49 | props = concat.call(props, Object.getOwnPropertySymbols(map));
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50 | }
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51 | for (var i = 0; i < props.length; i += 1) {
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52 | defineProperty(object, props[i], map[props[i]], predicates[props[i]]);
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53 | }
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54 | };
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55 |
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56 | defineProperties.supportsDescriptors = !!supportsDescriptors;
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57 |
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58 | module.exports = defineProperties;
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