add all frontend files

node_modules/es-abstract/2016/thisTimeValue.js

@@ -0,0 +1,9 @@
+'use strict';
+
+var timeValue = require('../helpers/timeValue');
+
+// https://262.ecma-international.org/6.0/#sec-properties-of-the-date-prototype-object
+
+module.exports = function thisTimeValue(value) {
+	return timeValue(value);
+};