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node_modules/es-abstract/2017/TestIntegrityLevel.js
| 42 lines
| 1.2 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $gOPD = require('../helpers/getOwnPropertyDescriptor'); | ||||
| var $gOPN = GetIntrinsic('%Object.getOwnPropertyNames%'); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var every = require('../helpers/every'); | ||||
| var IsDataDescriptor = require('./IsDataDescriptor'); | ||||
| var IsExtensible = require('./IsExtensible'); | ||||
| var ToPropertyDescriptor = require('./ToPropertyDescriptor'); | ||||
| var Type = require('./Type'); | ||||
| // https://www.ecma-international.org/ecma-262/6.0/#sec-testintegritylevel | ||||
| module.exports = function TestIntegrityLevel(O, level) { | ||||
| if (Type(O) !== 'Object') { | ||||
| throw new $TypeError('Assertion failed: Type(O) is not Object'); | ||||
| } | ||||
| if (level !== 'sealed' && level !== 'frozen') { | ||||
| throw new $TypeError('Assertion failed: `level` must be `"sealed"` or `"frozen"`'); | ||||
| } | ||||
| var status = IsExtensible(O); | ||||
| if (status) { | ||||
| return false; | ||||
| } | ||||
| var theKeys = $gOPN(O); | ||||
| return theKeys.length === 0 || every(theKeys, function (k) { | ||||
| var currentDesc = $gOPD(O, k); | ||||
| if (typeof currentDesc !== 'undefined') { | ||||
| if (currentDesc.configurable) { | ||||
| return false; | ||||
| } | ||||
| if (level === 'frozen' && IsDataDescriptor(ToPropertyDescriptor(currentDesc)) && currentDesc.writable) { | ||||
| return false; | ||||
| } | ||||
| } | ||||
| return true; | ||||
| }); | ||||
| }; | ||||