Index: frontend/node_modules/array-includes/shim.js
===================================================================
--- frontend/node_modules/array-includes/shim.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/array-includes/shim.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,14 @@
+'use strict';
+
+var define = require('define-properties');
+var getPolyfill = require('./polyfill');
+
+module.exports = function shimArrayPrototypeIncludes() {
+	var polyfill = getPolyfill();
+	define(
+		Array.prototype,
+		{ includes: polyfill },
+		{ includes: function () { return Array.prototype.includes !== polyfill; } }
+	);
+	return polyfill;
+};