types: fix syncmanager typedefs to use abstractlevel (#309)

* fix syncmanager to use abstractlevel

* fix type

* organize imports

packages/agent/src/sync-manager.ts

@@ -1,20 +1,17 @@
-import type { BatchOperation } from 'level';
+import { DataStream } from '@tbd54566975/dwn-sdk-js';
+import { Convert } from '@web5/common';
+import { utils as didUtils } from '@web5/dids';
+import { Level } from 'level';
+import { webReadableToIsomorphicNodeReadable } from './utils.js';
 import type {
   EventsGetReply,
   GenericMessage,
   MessagesGetReply,
   RecordsWriteMessage,
 } from '@tbd54566975/dwn-sdk-js';
-
-import { Level } from 'level';
-import { Convert } from '@web5/common';
-import { utils as didUtils } from '@web5/dids';
-import { DataStream } from '@tbd54566975/dwn-sdk-js';
-
+import type { AbstractBatchOperation, AbstractLevel } from 'abstract-level';
 import type { Web5ManagedAgent } from './types/agent.js';
 
-import { webReadableToIsomorphicNodeReadable } from './utils.js';
-
 export interface SyncManager {
   agent: Web5ManagedAgent;
   registerIdentity(options: { did: string }): Promise<void>;
@@ -24,10 +21,12 @@ export interface SyncManager {
   pull(): Promise<void>;
 }
 
+type LevelDatabase = AbstractLevel<string | Buffer | Uint8Array, string, string>;
+
 export type SyncManagerOptions = {
   agent?: Web5ManagedAgent;
   dataPath?: string;
-  db?: Level;
+  db?: LevelDatabase;
 };
 
 type SyncDirection = 'push' | 'pull';
@@ -43,7 +42,7 @@ type DwnMessage = {
   data?: Blob;
 }
 
-type DbBatchOperation = BatchOperation<Level, string, string>;
+type DbBatchOperation = AbstractBatchOperation<LevelDatabase, string, string>;
 
 const is2xx = (code: number) => code >= 200 && code <= 299;
 const is4xx = (code: number) => code >= 400 && code <= 499;
@@ -57,7 +56,7 @@ export class SyncManagerLevel implements SyncManager {
    * operations within the broader Web5 agent framework.
    */
   private _agent?: Web5ManagedAgent;
-  private _db: Level;
+  private _db: LevelDatabase;
   private _syncIntervalId?: ReturnType<typeof setInterval>;
 
   constructor(options?: SyncManagerOptions) {