diff --git a/packages/formidable/formidable.d.ts b/packages/formidable/formidable.d.ts
index 87d4adc..405ae12 100644
--- a/packages/formidable/formidable.d.ts
+++ b/packages/formidable/formidable.d.ts
@@ -1,6 +1,12 @@
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore
+import IncomingForm from '@types/formidable/Formidable';
 import { Options } from 'formidable';
 import { RequestListener } from 'http';
 
-declare function formidable(options?: Options): Promise<RequestListener>;
+declare function formidable(
+  options?: Options,
+  initialize?: (formidable: IncomingForm) => void
+): Promise<RequestListener>;
 
 export = formidable;
diff --git a/packages/formidable/formidable.es.js b/packages/formidable/formidable.es.js
index 52dc80e..665ef57 100644
--- a/packages/formidable/formidable.es.js
+++ b/packages/formidable/formidable.es.js
@@ -3,11 +3,15 @@ import Formidable from 'formidable';
 /**
  * Formidable plugin
  * @param {object} options Formidable options
+ * @param {Function} initialize **Formidable** instance handler
  * @example
  * app.use(formidable())
  */
-export default function formidable(config = { multiples: true }) {
+export default function formidable(config = { multiples: true }, initialize) {
   const form = Formidable(config);
+  if (typeof initialize === 'function') {
+    initialize(form);
+  }
   return async function formidableHandler(req) {
     Object.assign(req.stream, req);
     await new Promise((resolve, reject) =>