43 строки
1.2 KiB
JavaScript
43 строки
1.2 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $gOPD = require('gopd');
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var $TypeError = GetIntrinsic('%TypeError%');
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var every = require('../helpers/every');
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var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
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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 = OwnPropertyKeys(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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