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node_modules/es-abstract/2017/TestIntegrityLevel.js

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+'use strict';
+
+var $gOPD = require('gopd');
+var $TypeError = require('es-errors/type');
+
+var every = require('../helpers/every');
+var OwnPropertyKeys = require('../helpers/OwnPropertyKeys');
+
+var IsDataDescriptor = require('./IsDataDescriptor');
+var IsExtensible = require('./IsExtensible');
+var ToPropertyDescriptor = require('./ToPropertyDescriptor');
+var Type = require('./Type');
+
+// https://262.ecma-international.org/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 = OwnPropertyKeys(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;
+	});
+};