Reimplement scripts with TS

packages/app/package.json

@@ -35,6 +35,9 @@
     "whatwg-fetch": "^3.0.0"
   },
   "devDependencies": {
+    "@types/debounce": "^1.2.0",
+    "@types/intl": "^1.2.0",
+    "@types/raf": "^3.4.0",
     "@types/react-helmet": "^5.0.15",
     "@types/webpack-env": "^1.15.0",
     "enzyme": "^3.8.0",

packages/app/services/captcha.ts

@@ -3,7 +3,7 @@ import options from 'app/services/api/options';
 
 let readyPromise: Promise<void>;
 let lang = 'en';
-let sitekey;
+let sitekey: string;
 
 export type CaptchaID = string;
 

packages/app/services/localStorage.ts

@@ -17,16 +17,17 @@ export function hasStorage() {
   return _hasStorage;
 }
 
-class DummyStorage {
-  getItem(key) {
+// TODO: work on
+class DummyStorage implements Storage {
+  getItem(key: string): string | null {
     return this[key] || null;
   }
 
-  setItem(key, value) {
+  setItem(key: string, value: string): void {
     this[key] = value;
   }
 
-  removeItem(key) {
+  removeItem(key: string): void {
     Reflect.deleteProperty(this, key);
   }
 }