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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 origDefineProperty = Object.defineProperty;
-
- var isFunction = function (fn) {
- return typeof fn === 'function' && toStr.call(fn) === '[object Function]';
- };
-
- var arePropertyDescriptorsSupported = function () {
- var obj = {};
- try {
- origDefineProperty(obj, 'x', { enumerable: false, value: obj });
- // eslint-disable-next-line no-unused-vars, no-restricted-syntax
- for (var _ in obj) { // jscs:ignore disallowUnusedVariables
- return false;
- }
- return obj.x === obj;
- } catch (e) { /* this is IE 8. */
- return false;
- }
- };
- var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
-
- var defineProperty = function (object, name, value, predicate) {
- if (name in object && (!isFunction(predicate) || !predicate())) {
- return;
- }
- if (supportsDescriptors) {
- origDefineProperty(object, name, {
- configurable: true,
- enumerable: false,
- value: value,
- writable: true
- });
- } else {
- 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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