diff --git a/frontend/svelte.config.js b/frontend/svelte.config.js
index e94e293c..3ca6f79a 100644
--- a/frontend/svelte.config.js
+++ b/frontend/svelte.config.js
@@ -8,6 +8,11 @@ const config = {
 	preprocess: vitePreprocess(),
 	kit: {
 		adapter: adapter(),
+		// $mocks resolves shared browser-test mock bodies (src/__mocks__). Declared here
+		// so svelte-check/tsconfig and both vite configs resolve it. See ADR-012.
+		alias: {
+			$mocks: 'src/__mocks__'
+		},
 		prerender: {
 			entries: ['/hilfe/transkription'],
 			// Disable crawl: by default SvelteKit follows nav links from