fix: reexport browser/dev from esm-env (#15206)

Author: Rich-Harris

.changeset/ripe-aliens-retire.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: re-export browser/dev from esm-env

packages/kit/src/runtime/app/environment/index.js

@@ -1,6 +1,2 @@
-import { BROWSER, DEV } from 'esm-env';
+export { BROWSER as browser, DEV as dev } from 'esm-env';
 export { building, version } from '__sveltekit/environment';
-
-export const browser = BROWSER;
-
-export const dev = DEV;