diff --git a/apps/server/src/collaboration/extensions/redis-sync/collab-proxy-socket.ts b/apps/server/src/collaboration/extensions/redis-sync/collab-proxy-socket.ts
index a168af0c..2633fccf 100644
--- a/apps/server/src/collaboration/extensions/redis-sync/collab-proxy-socket.ts
+++ b/apps/server/src/collaboration/extensions/redis-sync/collab-proxy-socket.ts
@@ -5,7 +5,7 @@ import type {
   RSAMessageClose,
   RSAMessagePing,
   RSAMessageSend,
-} from './redis-sync.extension';
+} from './redis-sync.types';
 
 export class CollabProxySocket extends EventEmitter {
   private replyTo: string;
diff --git a/apps/server/src/collaboration/extensions/redis-sync/redis-sync.extension.ts b/apps/server/src/collaboration/extensions/redis-sync/redis-sync.extension.ts
index c4013126..fb01bb13 100644
--- a/apps/server/src/collaboration/extensions/redis-sync/redis-sync.extension.ts
+++ b/apps/server/src/collaboration/extensions/redis-sync/redis-sync.extension.ts
@@ -1,7 +1,5 @@
 // Source https://github.com/ueberdosis/hocuspocus/pull/1008
-import type EventEmitter from 'node:events';
 import type { IncomingMessage } from 'node:http';
-import type { IncomingHttpHeaders } from 'node:http2';
 import {
   type Extension,
   type Hocuspocus,
@@ -14,129 +12,36 @@ import type RedisClient from 'ioredis';
 import { readVarString } from 'lib0/decoding.js';
 import type { WebSocket } from 'ws';
 import { CollabProxySocket } from './collab-proxy-socket';
+import { Injectable } from '@nestjs/common';
+import type {
+  BaseWebSocket,
+  Configuration,
+  CustomEvents,
+  Pack,
+  RSAMessage,
+  RSAMessageCloseProxy,
+  RSAMessageCustomEventComplete,
+  RSAMessageCustomEventStart,
+  RSAMessagePong,
+  RSAMessageProxy,
+  RSAMessageUnload,
+  SerializedHTTPRequest,
+  Unpack,
+} from './redis-sync.types';
 
-export type SecondParam<T> = T extends (
-  arg1: unknown,
-  arg2: infer A,
-  ...args: unknown[]
-) => unknown
-  ? A
-  : never;
-export type RSAMessageProxy = {
-  type: 'proxy';
-  replyTo: string;
-  // @ts-ignore
-  message: Uint8Array<ArrayBufferLike>;
-  serializedHTTPRequest: SerializedHTTPRequest;
-};
+export type { Pack, SerializedHTTPRequest } from './redis-sync.types';
 
-export type RSAMessageCloseProxy = {
-  type: 'closeProxy';
-  socketId: string;
-};
-
-export type RSAMessageUnload = {
-  type: 'unload';
-  documentName: string;
-};
-
-export type RSAMessageClose = {
-  type: 'close';
-  code?: number;
-  reason?: string;
-  socketId: string;
-};
-
-export type RSAMessagePing = {
-  type: 'ping';
-  socketId: string;
-  respondTo: string;
-};
-
-export type RSAMessagePong = {
-  type: 'pong';
-  socketId: string;
-};
-
-export type RSAMessageSend = {
-  type: 'send';
-  // @ts-ignore
-  message: Uint8Array<ArrayBufferLike>;
-  socketId: string;
-};
-
-export type RSAMessageCustomEventStart<TName = string, TPayload = unknown> = {
-  type: 'customEventStart';
-  documentName: string;
-  eventName: TName;
-  payload: TPayload;
-  replyTo: string;
-  replyId: number;
-};
-
-export type RSAMessageCustomEventComplete = {
-  type: 'customEventComplete';
-  replyId: number;
-  payload: unknown;
-};
-
-export type RSAMessage =
-  | RSAMessageProxy
-  | RSAMessageCloseProxy
-  | RSAMessageUnload
-  | RSAMessageClose
-  | RSAMessagePing
-  | RSAMessagePong
-  | RSAMessageSend
-  | RSAMessageCustomEventStart
-  | RSAMessageCustomEventComplete;
-
-export type SerializedHTTPRequest = {
-  method: string;
-  url: string;
-  headers: IncomingHttpHeaders & { 'sec-websocket-key': string };
-  socket: { remoteAddress: string };
-};
-// @ts-ignore
-export type Pack = (msg: RSAMessage) => string | Buffer<ArrayBufferLike>;
-type Unpack = (
-  // @ts-ignore
-  packedMessage: Uint8Array | Buffer<ArrayBufferLike>,
-) => RSAMessage;
 type ServerId = string;
 type DocumentName = string;
 type SocketId = string;
-type CustomEventName = string;
-type CustomEvents = Record<
-  CustomEventName,
-  (documentName: string, payload: unknown) => Promise<unknown>
->;
-
-interface Configuration<TCE> {
-  redis: RedisClient;
-  pack: Pack;
-  unpack: Unpack;
-  serverId: ServerId;
-  lockTTL?: number;
-  customEventTTL?: number;
-  proxySocketTTL?: number;
-  prefix?: string;
-  customEvents?: TCE;
-}
-
-interface BaseWebSocket extends EventEmitter {
-  readyState: number;
-  close(code?: number, reason?: string): void;
-  ping(): void;
-  send(message: Uint8Array): void;
-}
 
+@Injectable()
 export class RedisSyncExtension<TCE extends CustomEvents> implements Extension {
   priority = 1000;
-  private pub: RedisClient;
+  private readonly pub: RedisClient;
   private sub: RedisClient;
-  private pack: Pack;
-  private unpack: Unpack;
+  private readonly pack: Pack;
+  private readonly unpack: Unpack;
   private originSockets: Record<SocketId, BaseWebSocket> = {};
   private locks: Record<DocumentName, NodeJS.Timeout> = {};
   private lockPromises: Record<DocumentName, Promise<ServerId | null>> = {};
@@ -144,15 +49,15 @@ export class RedisSyncExtension<TCE extends CustomEvents> implements Extension {
     SocketId,
     { socket: CollabProxySocket; cleanup: NodeJS.Timeout }
   > = {};
-  private prefix: string;
-  private lockPrefix: string;
-  private msgChannel: string;
-  private serverId: ServerId;
-  private customEventTTL: number;
-  private lockTTL: number;
-  private proxySocketTTL: number;
+  private readonly prefix: string;
+  private readonly lockPrefix: string;
+  private readonly msgChannel: string;
+  private readonly serverId: ServerId;
+  private readonly customEventTTL: number;
+  private readonly lockTTL: number;
+  private readonly proxySocketTTL: number;
   private instance!: Hocuspocus;
-  private customEvents: TCE;
+  private readonly customEvents: TCE;
   private replyIdCounter = 0;
   private pendingReplies: Record<
     number,
diff --git a/apps/server/src/collaboration/extensions/redis-sync/redis-sync.types.ts b/apps/server/src/collaboration/extensions/redis-sync/redis-sync.types.ts
new file mode 100644
index 00000000..aefdcc19
--- /dev/null
+++ b/apps/server/src/collaboration/extensions/redis-sync/redis-sync.types.ts
@@ -0,0 +1,123 @@
+import type EventEmitter from 'node:events';
+import type { IncomingHttpHeaders } from 'node:http2';
+import type RedisClient from 'ioredis';
+
+export type SecondParam<T> = T extends (
+  arg1: unknown,
+  arg2: infer A,
+  ...args: unknown[]
+) => unknown
+  ? A
+  : never;
+
+export type SerializedHTTPRequest = {
+  method: string;
+  url: string;
+  headers: IncomingHttpHeaders & { 'sec-websocket-key': string };
+  socket: { remoteAddress: string };
+};
+
+export type RSAMessageProxy = {
+  type: 'proxy';
+  replyTo: string;
+  // @ts-ignore
+  message: Uint8Array<ArrayBufferLike>;
+  serializedHTTPRequest: SerializedHTTPRequest;
+};
+
+export type RSAMessageCloseProxy = {
+  type: 'closeProxy';
+  socketId: string;
+};
+
+export type RSAMessageUnload = {
+  type: 'unload';
+  documentName: string;
+};
+
+export type RSAMessageClose = {
+  type: 'close';
+  code?: number;
+  reason?: string;
+  socketId: string;
+};
+
+export type RSAMessagePing = {
+  type: 'ping';
+  socketId: string;
+  respondTo: string;
+};
+
+export type RSAMessagePong = {
+  type: 'pong';
+  socketId: string;
+};
+
+export type RSAMessageSend = {
+  type: 'send';
+  // @ts-ignore
+  message: Uint8Array<ArrayBufferLike>;
+  socketId: string;
+};
+
+export type RSAMessageCustomEventStart<TName = string, TPayload = unknown> = {
+  type: 'customEventStart';
+  documentName: string;
+  eventName: TName;
+  payload: TPayload;
+  replyTo: string;
+  replyId: number;
+};
+
+export type RSAMessageCustomEventComplete = {
+  type: 'customEventComplete';
+  replyId: number;
+  payload: unknown;
+};
+
+export type RSAMessage =
+  | RSAMessageProxy
+  | RSAMessageCloseProxy
+  | RSAMessageUnload
+  | RSAMessageClose
+  | RSAMessagePing
+  | RSAMessagePong
+  | RSAMessageSend
+  | RSAMessageCustomEventStart
+  | RSAMessageCustomEventComplete;
+
+// @ts-ignore
+export type Pack = (msg: RSAMessage) => string | Buffer<ArrayBufferLike>;
+
+export type Unpack = (
+  // @ts-ignore
+  packedMessage: Uint8Array | Buffer<ArrayBufferLike>,
+) => RSAMessage;
+
+type ServerId = string;
+type DocumentName = string;
+type CustomEventName = string;
+
+export type CustomEvents = Record<
+  CustomEventName,
+  (documentName: string, payload: unknown) => Promise<unknown>
+>;
+
+export type Configuration<TCE> = {
+  redis: RedisClient;
+  pack: Pack;
+  unpack: Unpack;
+  serverId: ServerId;
+  lockTTL?: number;
+  customEventTTL?: number;
+  proxySocketTTL?: number;
+  prefix?: string;
+  customEvents?: TCE;
+};
+
+export type BaseWebSocket = EventEmitter & {
+  readyState: number;
+  close(code?: number, reason?: string): void;
+  ping(): void;
+  send(message: Uint8Array): void;
+};