add all frontend files

node_modules/es-shim-unscopables/index.d.ts

@@ -0,0 +1,8 @@
+type Unscopableable = string & {
+    [K in keyof typeof Array.prototype]:
+      typeof Array.prototype[K] extends Function ? K : never
+  }[keyof typeof Array.prototype];
+
+declare function shimUnscopables(method: Unscopableable): void;
+
+export = shimUnscopables;