Types on src/background

src/background/controllers/FindController.ts

@@ -1,15 +1,17 @@
 import FindUseCase from '../usecases/FindUseCase';
 
 export default class FindController {
+  private findUseCase: FindUseCase;
+
   constructor() {
     this.findUseCase = new FindUseCase();
   }
 
-  getKeyword() {
+  getKeyword(): Promise<string> {
     return this.findUseCase.getKeyword();
   }
 
-  setKeyword(keyword) {
+  setKeyword(keyword: string): Promise<any> {
     return this.findUseCase.setKeyword(keyword);
   }
 }