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- var isES5 = (function(){
- "use strict";
- return this === undefined;
- })();
- if (isES5) {
- module.exports = {
- freeze: Object.freeze,
- defineProperty: Object.defineProperty,
- getDescriptor: Object.getOwnPropertyDescriptor,
- keys: Object.keys,
- names: Object.getOwnPropertyNames,
- getPrototypeOf: Object.getPrototypeOf,
- isArray: Array.isArray,
- isES5: isES5,
- propertyIsWritable: function(obj, prop) {
- var descriptor = Object.getOwnPropertyDescriptor(obj, prop);
- return !!(!descriptor || descriptor.writable || descriptor.set);
- }
- };
- } else {
- var has = {}.hasOwnProperty;
- var str = {}.toString;
- var proto = {}.constructor.prototype;
- var ObjectKeys = function (o) {
- var ret = [];
- for (var key in o) {
- if (has.call(o, key)) {
- ret.push(key);
- }
- }
- return ret;
- };
- var ObjectGetDescriptor = function(o, key) {
- return {value: o[key]};
- };
- var ObjectDefineProperty = function (o, key, desc) {
- o[key] = desc.value;
- return o;
- };
- var ObjectFreeze = function (obj) {
- return obj;
- };
- var ObjectGetPrototypeOf = function (obj) {
- try {
- return Object(obj).constructor.prototype;
- }
- catch (e) {
- return proto;
- }
- };
- var ArrayIsArray = function (obj) {
- try {
- return str.call(obj) === "[object Array]";
- }
- catch(e) {
- return false;
- }
- };
- module.exports = {
- isArray: ArrayIsArray,
- keys: ObjectKeys,
- names: ObjectKeys,
- defineProperty: ObjectDefineProperty,
- getDescriptor: ObjectGetDescriptor,
- freeze: ObjectFreeze,
- getPrototypeOf: ObjectGetPrototypeOf,
- isES5: isES5,
- propertyIsWritable: function() {
- return true;
- }
- };
- }
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