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