diff --git a/packages/ui-default/components/scratchpad/reducers/editor.js b/packages/ui-default/components/scratchpad/reducers/editor.ts
similarity index 100%
rename from packages/ui-default/components/scratchpad/reducers/editor.js
rename to packages/ui-default/components/scratchpad/reducers/editor.ts
diff --git a/packages/ui-default/components/scratchpad/reducers/index.js b/packages/ui-default/components/scratchpad/reducers/index.ts
similarity index 83%
rename from packages/ui-default/components/scratchpad/reducers/index.js
rename to packages/ui-default/components/scratchpad/reducers/index.ts
index 1ba625c11..833f650b7 100644
--- a/packages/ui-default/components/scratchpad/reducers/index.js
+++ b/packages/ui-default/components/scratchpad/reducers/index.ts
@@ -12,3 +12,4 @@ const reducer = combineReducers({
 });
 
 export default reducer;
+export type RootState = ReturnType<typeof reducer>;
diff --git a/packages/ui-default/components/scratchpad/reducers/pretest.js b/packages/ui-default/components/scratchpad/reducers/pretest.ts
similarity index 100%
rename from packages/ui-default/components/scratchpad/reducers/pretest.js
rename to packages/ui-default/components/scratchpad/reducers/pretest.ts
diff --git a/packages/ui-default/components/scratchpad/reducers/records.js b/packages/ui-default/components/scratchpad/reducers/records.ts
similarity index 100%
rename from packages/ui-default/components/scratchpad/reducers/records.js
rename to packages/ui-default/components/scratchpad/reducers/records.ts
diff --git a/packages/ui-default/components/scratchpad/reducers/ui.js b/packages/ui-default/components/scratchpad/reducers/ui.ts
similarity index 100%
rename from packages/ui-default/components/scratchpad/reducers/ui.js
rename to packages/ui-default/components/scratchpad/reducers/ui.ts
diff --git a/packages/ui-default/utils/loadReactRedux.js b/packages/ui-default/utils/loadReactRedux.ts
similarity index 84%
rename from packages/ui-default/utils/loadReactRedux.js
rename to packages/ui-default/utils/loadReactRedux.ts
index 5f5de7c1f..468b9f85e 100644
--- a/packages/ui-default/utils/loadReactRedux.js
+++ b/packages/ui-default/utils/loadReactRedux.ts
@@ -1,4 +1,6 @@
-export default async function loadReactRedux(storeReducer) {
+import { Action, AnyAction, Reducer } from 'redux';
+
+export default async function loadReactRedux<S, A extends Action = AnyAction>(storeReducer: Reducer<S, A>) {
   const React = await import('react');
   const { render, unmountComponentAtNode } = await import('react-dom');
   const { Provider } = await import('react-redux');