main
Last change
on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago |
Update repo after prototype presentation
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100644
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File size:
1.3 KB
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1 | 'use strict';
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2 |
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3 | var GetIntrinsic = require('get-intrinsic');
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4 | var IsCallable = require('es-abstract/2024/IsCallable');
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5 | var Type = require('es-abstract/2024/Type');
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6 | var whichBuiltinType = require('which-builtin-type');
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7 | var $TypeError = require('es-errors/type');
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8 |
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9 | var $gPO = GetIntrinsic('%Object.getPrototypeOf%', true);
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10 | var $ObjectPrototype = GetIntrinsic('%Object.prototype%');
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11 |
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12 | var hasProto = [].__proto__ === Array.prototype; // eslint-disable-line no-proto
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13 |
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14 | module.exports = function getPrototypeOf(O) {
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15 | if (Type(O) !== 'Object') {
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16 | throw new $TypeError('Reflect.getPrototypeOf called on non-object');
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17 | }
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18 |
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19 | if ($gPO) {
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20 | return $gPO(O);
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21 | }
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22 |
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23 | if (hasProto) {
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24 | // eslint-disable-next-line no-proto
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25 | var proto = O.__proto__;
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26 | if (proto || proto === null) {
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27 | return proto;
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28 | }
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29 | }
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30 | var type = whichBuiltinType(O);
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31 | if (type) {
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32 | var intrinsic = GetIntrinsic('%' + type + '.prototype%', true);
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33 | if (intrinsic) {
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34 | return intrinsic;
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35 | }
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36 | }
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37 | if (IsCallable(O.constructor)) {
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38 | return O.constructor.prototype;
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39 | }
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40 | if (O instanceof Object) {
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41 | return $ObjectPrototype;
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42 | }
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43 |
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44 | /*
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45 | * Correctly return null for Objects created with `Object.create(null)` (shammed or native) or `{ __proto__: null}`. Also returns null for
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46 | * cross-realm objects on browsers that lack `__proto__` support (like IE <11), but that's the best we can do.
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47 | */
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48 | return null;
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49 | };
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