fix(*): Fix compilation problems in my local environment

Author: schmidt-sebastian

src/messaging/controllers/window-controller.ts

@@ -247,7 +247,7 @@ export default class WindowController extends ControllerInterface {
     const serviceWorker = registration.installing || registration.waiting ||
       registration.active;
 
-    return new Promise((resolve, reject) => {
+    return new Promise<ServiceWorkerRegistration>((resolve, reject) => {
       if (!serviceWorker) {
         // This is a rare scenario but has occured in firefox
         reject(this.errorFactory_.create(Errors.codes.NO_SW_IN_REG));

src/messaging/models/db-interface.ts

@@ -25,7 +25,7 @@ export default class DBInterface {
   private dbVersion_: number;
   private openDbPromise_: Promise<IDBDatabase>;
   protected errorFactory_: ErrorFactory<string>;
-  protected TRANSACTION_READ_WRITE: string;
+  protected TRANSACTION_READ_WRITE: IDBTransactionMode;
 
   /**
    * @param {string} dbName

src/storage/task.ts

@@ -493,13 +493,13 @@ export class UploadTask {
   /**
    * This object behaves like a Promise, and resolves with its snapshot data
    * when the upload completes.
-   *     The fulfillment callback. Promise chaining works as normal.
+   * @param onFulfilled The fulfillment callback. Promise chaining works as normal.
    * @param onRejected The rejection callback.
    */
   then<U>(onFulfilled?: ((value: UploadTaskSnapshot) => U | PromiseLike<U>) | null, onRejected?: ((error: any) => U | PromiseLike<U>) | null): Promise<U> {
       return this.promise_.then<U>(
         (onFulfilled as (value: UploadTaskSnapshot) => U | PromiseLike<U>),
-        (onRejected as ((error: any) => PromiseLike<U>) | null));
+        (onRejected as ((error: any) => PromiseLike<never>) | null));
   }
 
   /**