47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('../GetIntrinsic');
|
|
|
|
var $ObjectCreate = GetIntrinsic('%Object.create%', true);
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
var $SyntaxError = GetIntrinsic('%SyntaxError%');
|
|
|
|
var IsArray = require('./IsArray');
|
|
var Type = require('./Type');
|
|
|
|
var hasProto = !({ __proto__: null } instanceof Object);
|
|
|
|
// https://www.ecma-international.org/ecma-262/6.0/#sec-objectcreate
|
|
|
|
module.exports = function OrdinaryObjectCreate(proto) {
|
|
if (proto !== null && Type(proto) !== 'Object') {
|
|
throw new $TypeError('Assertion failed: `proto` must be null or an object');
|
|
}
|
|
var additionalInternalSlotsList = arguments.length < 2 ? [] : arguments[1];
|
|
if (!IsArray(additionalInternalSlotsList)) {
|
|
throw new $TypeError('Assertion failed: `additionalInternalSlotsList` must be an Array');
|
|
}
|
|
// var internalSlotsList = ['[[Prototype]]', '[[Extensible]]'];
|
|
if (additionalInternalSlotsList.length > 0) {
|
|
throw new $SyntaxError('es-abstract does not yet support internal slots');
|
|
// internalSlotsList.push(...additionalInternalSlotsList);
|
|
}
|
|
// var O = MakeBasicObject(internalSlotsList);
|
|
// setProto(O, proto);
|
|
// return O;
|
|
|
|
if ($ObjectCreate) {
|
|
return $ObjectCreate(proto);
|
|
}
|
|
if (hasProto) {
|
|
return { __proto__: proto };
|
|
}
|
|
|
|
if (proto === null) {
|
|
throw new $SyntaxError('native Object.create support is required to create null objects');
|
|
}
|
|
var T = function T() {};
|
|
T.prototype = proto;
|
|
return new T();
|
|
};
|