diff --git a/packages/@uppy/companion/src/server/emitter/default-emitter.ts b/packages/@uppy/companion/src/server/emitter/default-emitter.ts
index f8dfc739a..5d0ebe7c0 100644
--- a/packages/@uppy/companion/src/server/emitter/default-emitter.ts
+++ b/packages/@uppy/companion/src/server/emitter/default-emitter.ts
@@ -1,5 +1,6 @@
 import { EventEmitter } from 'node:events'
+import type { EmitterLike } from './index.ts'
 
-export default function defaultEmitter() {
+export default function defaultEmitter(): EmitterLike {
   return new EventEmitter()
 }
diff --git a/packages/@uppy/companion/src/server/emitter/index.ts b/packages/@uppy/companion/src/server/emitter/index.ts
index 0d2276a12..428a41d9c 100644
--- a/packages/@uppy/companion/src/server/emitter/index.ts
+++ b/packages/@uppy/companion/src/server/emitter/index.ts
@@ -4,7 +4,7 @@ import redisEmitter from './redis-emitter.ts'
 
 type Listener = (...args: unknown[]) => void
 
-export type EmitterLike = {
+export interface EmitterLike {
   on: (eventName: string, handler: Listener) => unknown
   once: (eventName: string, handler: Listener) => unknown
   off?: (eventName: string, handler: Listener) => unknown
diff --git a/packages/@uppy/companion/src/server/emitter/redis-emitter.ts b/packages/@uppy/companion/src/server/emitter/redis-emitter.ts
index c91ceb6ce..ef749cda2 100644
--- a/packages/@uppy/companion/src/server/emitter/redis-emitter.ts
+++ b/packages/@uppy/companion/src/server/emitter/redis-emitter.ts
@@ -2,6 +2,7 @@ import { EventEmitter } from 'node:events'
 import safeStringify from 'fast-safe-stringify'
 import type { Redis } from 'ioredis'
 import * as logger from '../logger.ts'
+import type { EmitterLike } from './index.ts'
 
 function replacer(key: string, value: unknown): unknown {
   // Remove the circular structure and internal ones
@@ -19,7 +20,7 @@ function replacer(key: string, value: unknown): unknown {
 export default function redisEmitter(
   redisClient: Redis,
   redisPubSubScope?: string,
-) {
+): EmitterLike {
   const prefix = redisPubSubScope ? `${redisPubSubScope}:` : ''
   const getPrefixedEventName = (eventName: string) => `${prefix}${eventName}`