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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
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+'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;
+ });
+};