53 lines
1.4 KiB
JavaScript
53 lines
1.4 KiB
JavaScript
'use strict';
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var has = require('has');
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var GetIntrinsic = require('../GetIntrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var Type = require('./Type');
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var ToBoolean = require('./ToBoolean');
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var IsCallable = require('./IsCallable');
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// https://ecma-international.org/ecma-262/5.1/#sec-8.10.5
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module.exports = function ToPropertyDescriptor(Obj) {
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if (Type(Obj) !== 'Object') {
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throw new $TypeError('ToPropertyDescriptor requires an object');
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}
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var desc = {};
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if (has(Obj, 'enumerable')) {
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desc['[[Enumerable]]'] = ToBoolean(Obj.enumerable);
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}
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if (has(Obj, 'configurable')) {
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desc['[[Configurable]]'] = ToBoolean(Obj.configurable);
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}
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if (has(Obj, 'value')) {
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desc['[[Value]]'] = Obj.value;
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}
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if (has(Obj, 'writable')) {
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desc['[[Writable]]'] = ToBoolean(Obj.writable);
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}
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if (has(Obj, 'get')) {
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var getter = Obj.get;
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if (typeof getter !== 'undefined' && !IsCallable(getter)) {
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throw new $TypeError('getter must be a function');
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}
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desc['[[Get]]'] = getter;
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}
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if (has(Obj, 'set')) {
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var setter = Obj.set;
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if (typeof setter !== 'undefined' && !IsCallable(setter)) {
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throw new $TypeError('setter must be a function');
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}
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desc['[[Set]]'] = setter;
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}
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if ((has(desc, '[[Get]]') || has(desc, '[[Set]]')) && (has(desc, '[[Value]]') || has(desc, '[[Writable]]'))) {
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throw new $TypeError('Invalid property descriptor. Cannot both specify accessors and a value or writable attribute');
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}
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return desc;
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};
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