--- /dev/null
+var $ = require('../internals/export');
+var isArray = require('../internals/is-array');
+
+var isFrozen = Object.isFrozen;
+
+var isFrozenStringArray = function (array, allowUndefined) {
+ if (!isFrozen || !isArray(array) || !isFrozen(array)) return false;
+ var index = 0;
+ var length = array.length;
+ var element;
+ while (index < length) {
+ element = array[index++];
+ if (!(typeof element === 'string' || (allowUndefined && typeof element === 'undefined'))) {
+ return false;
+ }
+ } return length !== 0;
+};
+
+// `Array.isTemplateObject` method
+// https://github.com/tc39/proposal-array-is-template-object
+$({ target: 'Array', stat: true }, {
+ isTemplateObject: function isTemplateObject(value) {
+ if (!isFrozenStringArray(value, true)) return false;
+ var raw = value.raw;
+ if (raw.length !== value.length || !isFrozenStringArray(raw, false)) return false;
+ return true;
+ }
+});