bug fixes

packages/vjudge/src/index.ts

@@ -155,7 +155,9 @@ class AccountService {
         this.syncing = false;
     }
 
-    async stop() { } // eslint-disable-line @typescript-eslint/no-empty-function
+    async stop() {
+        return this.api?.stop?.();
+    }
 
     async main() {
         const res = await this.login();

packages/vjudge/src/interface.ts

@@ -41,6 +41,7 @@ export interface IBasicProvider {
     submitProblem(id: string, lang: string, code: string, info: any, next: NextFunction, end: NextFunction): Promise<string | void>;
     waitForSubmission(id: string, next: NextFunction, end: NextFunction): Promise<void>;
     checkStatus?: (onCheckFunc: boolean) => Promise<void>;
+    stop?: () => Promise<void>;
 }
 
 export interface BasicProvider {