| 1 | 'use strict';
|
| 2 |
|
| 3 | const isObject = val => val !== null && typeof val === 'object';
|
| 4 | const dataDesc = new Set(['configurable', 'enumerable', 'get', 'set']);
|
| 5 | const accDesc = new Set(['configurable', 'enumerable', 'writable', 'value']);
|
| 6 |
|
| 7 | module.exports = (obj, key, checkProto) => {
|
| 8 | if (!isObject(obj)) return false;
|
| 9 | let desc = key ? Object.getOwnPropertyDescriptor(obj, key) : obj;
|
| 10 |
|
| 11 | if (!desc && key && checkProto !== false && obj.constructor) {
|
| 12 | desc = Object.getOwnPropertyDescriptor(obj.constructor.prototype, key);
|
| 13 | }
|
| 14 |
|
| 15 | if (!isObject(desc)) return false;
|
| 16 | if (typeof desc.configurable !== 'boolean' || typeof desc.enumerable !== 'boolean') {
|
| 17 | return false;
|
| 18 | }
|
| 19 |
|
| 20 | let keys = Object.keys(desc);
|
| 21 | if (isDataDesc(keys)) {
|
| 22 | if (typeof desc.get !== 'function' && desc.get !== void 0) return false;
|
| 23 | if (typeof desc.set !== 'function' && desc.set !== void 0) return false;
|
| 24 | return true;
|
| 25 | }
|
| 26 |
|
| 27 | if (isAccessorDesc(keys)) {
|
| 28 | return typeof desc.writable === 'boolean';
|
| 29 | }
|
| 30 | return false;
|
| 31 | };
|
| 32 |
|
| 33 | function isDataDesc(keys) {
|
| 34 | return keys.every(k => dataDesc.has(k));
|
| 35 | }
|
| 36 |
|
| 37 | function isAccessorDesc(keys) {
|
| 38 | return keys.every(k => accDesc.has(k));
|
| 39 | }
|