diff --git a/src/middlewares/withMiddleware.js b/src/middlewares/withMiddleware.js
deleted file mode 100644
index ce50ce6a..00000000
--- a/src/middlewares/withMiddleware.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import { withCollection } from './withCollection'
-
-export const withMiddleware = handler => withCollection(handler)
diff --git a/src/middlewares/withMiddleware.ts b/src/middlewares/withMiddleware.ts
new file mode 100644
index 00000000..c3b4f758
--- /dev/null
+++ b/src/middlewares/withMiddleware.ts
@@ -0,0 +1,6 @@
+import { withCollection } from './withCollection'
+import { NextApiRequest, NextApiResponse } from 'next'
+
+export type Handler = (req: NextApiRequest, res: NextApiResponse) => void
+
+export const withMiddleware = (handler: Handler) => withCollection(handler)