58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var $SyntaxError = GetIntrinsic('%SyntaxError%');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $preventExtensions = GetIntrinsic('%Object.preventExtensions%');
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var $gOPD = GetIntrinsic('%Object.getOwnPropertyDescriptor%');
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var $gOPN = GetIntrinsic('%Object.getOwnPropertyNames%');
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var forEach = require('../helpers/forEach');
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var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
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var IsAccessorDescriptor = require('./IsAccessorDescriptor');
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var ToPropertyDescriptor = require('./ToPropertyDescriptor');
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var Type = require('./Type');
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// https://www.ecma-international.org/ecma-262/6.0/#sec-setintegritylevel
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module.exports = function SetIntegrityLevel(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 $TypeError('Assertion failed: `level` must be `"sealed"` or `"frozen"`');
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}
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if (!$preventExtensions) {
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throw new $SyntaxError('SetIntegrityLevel requires native `Object.preventExtensions` support');
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}
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var status = $preventExtensions(O);
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if (!status) {
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return false;
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}
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if (!$gOPN) {
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throw new $SyntaxError('SetIntegrityLevel requires native `Object.getOwnPropertyNames` support');
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}
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var theKeys = $gOPN(O);
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if (level === 'sealed') {
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forEach(theKeys, function (k) {
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DefinePropertyOrThrow(O, k, { configurable: false });
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});
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} else if (level === 'frozen') {
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forEach(theKeys, function (k) {
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var currentDesc = $gOPD(O, k);
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if (typeof currentDesc !== 'undefined') {
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var desc;
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if (IsAccessorDescriptor(ToPropertyDescriptor(currentDesc))) {
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desc = { configurable: false };
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} else {
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desc = { configurable: false, writable: false };
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}
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DefinePropertyOrThrow(O, k, desc);
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}
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});
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}
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return true;
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};
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