51 lines
1.3 KiB
JavaScript
51 lines
1.3 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $ObjectCreate = GetIntrinsic('%Object.create%', true);
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var $TypeError = GetIntrinsic('%TypeError%');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var IsArray = require('./IsArray');
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var Type = require('./Type');
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var forEach = require('../helpers/forEach');
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var SLOT = require('internal-slot');
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var hasProto = require('has-proto')();
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// https://262.ecma-international.org/6.0/#sec-objectcreate
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module.exports = function ObjectCreate(proto, internalSlotsList) {
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if (proto !== null && Type(proto) !== 'Object') {
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throw new $TypeError('Assertion failed: `proto` must be null or an object');
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}
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var slots = arguments.length < 2 ? [] : internalSlotsList; // step 1
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if (arguments.length >= 2 && !IsArray(slots)) {
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throw new $TypeError('Assertion failed: `internalSlotsList` must be an Array');
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}
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var O;
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if ($ObjectCreate) {
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O = $ObjectCreate(proto);
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} else if (hasProto) {
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O = { __proto__: proto };
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} else {
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if (proto === null) {
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throw new $SyntaxError('native Object.create support is required to create null objects');
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}
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var T = function T() {};
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T.prototype = proto;
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O = new T();
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}
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if (slots.length > 0) {
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forEach(slots, function (slot) {
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SLOT.set(O, slot, void undefined);
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});
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}
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return O; // step 6
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};
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