diff --git a/src/runtime/internal/environment.js b/src/runtime/internal/environment.js
index af613b902d..821b3a413c 100644
--- a/src/runtime/internal/environment.js
+++ b/src/runtime/internal/environment.js
@@ -1,13 +1,18 @@
-import { noop } from './utils';
+import { noop } from './utils.js';
+
 export const is_client = typeof window !== 'undefined';
+
 /** @type {() => number} */
 export let now = is_client ? () => window.performance.now() : () => Date.now();
+
 export let raf = is_client ? (cb) => requestAnimationFrame(cb) : noop;
+
 // used internally for testing
 /** @returns {void} */
 export function set_now(fn) {
 	now = fn;
 }
+
 /** @returns {void} */
 export function set_raf(fn) {
 	raf = fn;