Skip to content
Permalink
9bfb9ba527
Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
Go to file
 
 
Cannot retrieve contributors at this time
57 lines (51 sloc) 1.78 KB
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $SyntaxError = GetIntrinsic('%SyntaxError%');
var $TypeError = GetIntrinsic('%TypeError%');
var $preventExtensions = GetIntrinsic('%Object.preventExtensions%', true);
var $gOPD = require('gopd');
var $gOPN = GetIntrinsic('%Object.getOwnPropertyNames%', true);
var forEach = require('../helpers/forEach');
var DefinePropertyOrThrow = require('./DefinePropertyOrThrow');
var IsAccessorDescriptor = require('./IsAccessorDescriptor');
var ToPropertyDescriptor = require('./ToPropertyDescriptor');
var Type = require('./Type');
// https://262.ecma-international.org/6.0/#sec-setintegritylevel
module.exports = function SetIntegrityLevel(O, level) {
if (Type(O) !== 'Object') {
throw new $TypeError('Assertion failed: Type(O) is not Object');
}
if (level !== 'sealed' && level !== 'frozen') {
throw new $TypeError('Assertion failed: `level` must be `"sealed"` or `"frozen"`');
}
if (!$preventExtensions) {
throw new $SyntaxError('SetIntegrityLevel requires native `Object.preventExtensions` support');
}
var status = $preventExtensions(O);
if (!status) {
return false;
}
if (!$gOPN) {
throw new $SyntaxError('SetIntegrityLevel requires native `Object.getOwnPropertyNames` support');
}
var theKeys = $gOPN(O);
if (level === 'sealed') {
forEach(theKeys, function (k) {
DefinePropertyOrThrow(O, k, { configurable: false });
});
} else if (level === 'frozen') {
forEach(theKeys, function (k) {
var currentDesc = $gOPD(O, k);
if (typeof currentDesc !== 'undefined') {
var desc;
if (IsAccessorDescriptor(ToPropertyDescriptor(currentDesc))) {
desc = { configurable: false };
} else {
desc = { configurable: false, writable: false };
}
DefinePropertyOrThrow(O, k, desc);
}
});
}
return true;
};