Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 1 | 'use strict'; |
| 2 | |
| 3 | var keys = require('object-keys'); |
| 4 | var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol'; |
| 5 | |
| 6 | var toStr = Object.prototype.toString; |
| 7 | var concat = Array.prototype.concat; |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 8 | var defineDataProperty = require('define-data-property'); |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 9 | |
| 10 | var isFunction = function (fn) { |
| 11 | return typeof fn === 'function' && toStr.call(fn) === '[object Function]'; |
| 12 | }; |
| 13 | |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 14 | var supportsDescriptors = require('has-property-descriptors')(); |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 15 | |
| 16 | var defineProperty = function (object, name, value, predicate) { |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 17 | if (name in object) { |
| 18 | if (predicate === true) { |
| 19 | if (object[name] === value) { |
| 20 | return; |
| 21 | } |
| 22 | } else if (!isFunction(predicate) || !predicate()) { |
| 23 | return; |
| 24 | } |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 25 | } |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 26 | |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 27 | if (supportsDescriptors) { |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 28 | defineDataProperty(object, name, value, true); |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 29 | } else { |
Nikolay Vitkov | d76576c | 2024-12-02 14:10:15 | [diff] [blame] | 30 | defineDataProperty(object, name, value); |
Yang Guo | 4fd355c | 2019-09-19 08:59:03 | [diff] [blame] | 31 | } |
| 32 | }; |
| 33 | |
| 34 | var defineProperties = function (object, map) { |
| 35 | var predicates = arguments.length > 2 ? arguments[2] : {}; |
| 36 | var props = keys(map); |
| 37 | if (hasSymbols) { |
| 38 | props = concat.call(props, Object.getOwnPropertySymbols(map)); |
| 39 | } |
| 40 | for (var i = 0; i < props.length; i += 1) { |
| 41 | defineProperty(object, props[i], map[props[i]], predicates[props[i]]); |
| 42 | } |
| 43 | }; |
| 44 | |
| 45 | defineProperties.supportsDescriptors = !!supportsDescriptors; |
| 46 | |
| 47 | module.exports = defineProperties; |