diff --git a/src/utils/Idler.js b/src/utils/Idler.tsx
similarity index 93%
rename from src/utils/Idler.js
rename to src/utils/Idler.tsx
index 772ab68ef..d20d71711 100644
--- a/src/utils/Idler.js
+++ b/src/utils/Idler.tsx
@@ -5,7 +5,7 @@
  * @format
  */
 
-import {CancelledPromiseError} from './errors.tsx';
+import {CancelledPromiseError} from './errors';
 
 export class Idler {
   lastIdle: number;
diff --git a/src/utils/__tests__/Idler.node.js b/src/utils/__tests__/Idler.node.js
index 38570a980..fd7027bae 100644
--- a/src/utils/__tests__/Idler.node.js
+++ b/src/utils/__tests__/Idler.node.js
@@ -5,7 +5,7 @@
  * @format
  */
 
-import {Idler} from '../Idler';
+import {Idler} from '../Idler.tsx';
 
 test('Idler should interrupt', async () => {
   const idler = new Idler();
diff --git a/src/utils/serialization.js b/src/utils/serialization.js
index 2bdd51661..a4b11ef9c 100644
--- a/src/utils/serialization.js
+++ b/src/utils/serialization.js
@@ -5,7 +5,7 @@
  * @format
  */
 
-import {Idler} from './Idler';
+import {Idler} from './Idler.tsx';
 export async function serialize(
   obj: Object,
   idler?: Idler,