[bull] fix: add missing low level methods (#42647)

* fix: add multi and toKey methods

* fix: return pipeline without promise

* test: add test

* style: fix lint

types/bull/bull-tests.tsx

@@ -250,3 +250,8 @@ new Queue('profile');
 new Queue('profile', 'url');
 new Queue('profile', { prefix: 'test' });
 new Queue('profile', 'url', { prefix: 'test' });
+
+// Use low-level API
+const multi = myQueue.multi();
+multi.del(myQueue.toKey('repeat'));
+multi.exec();

types/bull/index.d.ts

@@ -746,6 +746,16 @@ declare namespace Bull {
      */
     clean(grace: number, status?: JobStatusClean, limit?: number): Promise<Array<Job<T>>>;
 
+    /**
+     * Returns a promise that marks the start of a transaction block.
+     */
+    multi(): Redis.Pipeline;
+
+    /**
+     * Returns the queue specific key.
+     */
+    toKey(queueType: string): string;
+
     /**
      * Listens to queue events
      */