diff --git a/app/javascript/retrospring/utilities/on.ts b/app/javascript/retrospring/utilities/on.ts
index 6f29accd..fc778311 100644
--- a/app/javascript/retrospring/utilities/on.ts
+++ b/app/javascript/retrospring/utilities/on.ts
@@ -1,4 +1,4 @@
-type OnCallbackFunction = (event: Event) => void;
+export type OnCallbackFunction = (event: Event) => void;
 
 export function on(type: string, selector: string, callback: OnCallbackFunction): void {
   document.addEventListener(type, (event: Event) => {