diff --git a/client/env.d.ts b/client/env.d.ts
new file mode 100644
index 00000000..151aa685
--- /dev/null
+++ b/client/env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
\ No newline at end of file
diff --git a/client/src/views/TrackMapPage.vue b/client/src/views/TrackMapPage.vue
index 5253cfa6..0bbb6c92 100644
--- a/client/src/views/TrackMapPage.vue
+++ b/client/src/views/TrackMapPage.vue
@@ -81,7 +81,7 @@ configStore.loadConfig(props.sid)
         const mostRecentYear = years.value[0]
         if (mostRecentYear !== undefined) {
           loadTracksOfYear(mostRecentYear, true)
-          reportError("Initial load: most recent year is " + mostRecentYear)
+          // test line // reportError("Initial load: most recent year is " + mostRecentYear)
         } else {
           reportError("mostRecentYear is undefined")
         }
diff --git a/client/tests/unit/__mocks__/ResizeObserver.js b/client/tests/unit/__mocks__/ResizeObserver.js
deleted file mode 100644
index 85d97c36..00000000
--- a/client/tests/unit/__mocks__/ResizeObserver.js
+++ /dev/null
@@ -1,22 +0,0 @@
-import { vi } from 'vitest'
-
-const ResizeObserverMock = vi.fn(class {
-  observe = vi.fn()
-  unobserve = vi.fn()
-  disconnect = vi.fn()
-})
-
-// class ResizeObserverMock {
-//   observe () {}
-
-//   unobserve () {
-//     // do nothing
-//   }
-
-//   disconnect () {
-//     // do nothing
-//   }
-// }
-
-// window.ResizeObserver = ResizeObserver
-export default ResizeObserverMock
diff --git a/client/tests/unit/__mocks__/ResizeObserver.ts b/client/tests/unit/__mocks__/ResizeObserver.ts
new file mode 100644
index 00000000..3ad95fba
--- /dev/null
+++ b/client/tests/unit/__mocks__/ResizeObserver.ts
@@ -0,0 +1,9 @@
+import { vi } from 'vitest'
+
+const ResizeObserverMock = vi.fn(class {
+  observe = vi.fn()
+  unobserve = vi.fn()
+  disconnect = vi.fn()
+})
+
+export default ResizeObserverMock
diff --git a/client/tests/vitest-setupfiles/setup-jest-dom.js b/client/tests/vitest-setupfiles/setup-jest-dom.ts
similarity index 100%
rename from client/tests/vitest-setupfiles/setup-jest-dom.js
rename to client/tests/vitest-setupfiles/setup-jest-dom.ts
diff --git a/client/tsconfig.app.json b/client/tsconfig.app.json
index 5d121421..f2eac468 100644
--- a/client/tsconfig.app.json
+++ b/client/tsconfig.app.json
@@ -6,15 +6,12 @@
     "dist"
   ],
   "compilerOptions": {
-    "outDir": "dist_random", // satisfy vs code syntax check
     "composite": true,
     "module": "ESNext",
     "target": "es2022",
-    "lib": ["ES2022", "DOM"],
-    "baseUrl": ".",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "paths": {
       "@/*": ["./src/*"]
-    },
-    "allowJs": true // do we need it?
+    }
   }
 }
diff --git a/client/tsconfig.node.json b/client/tsconfig.node.json
index 878fa42d..e6bbc38c 100644
--- a/client/tsconfig.node.json
+++ b/client/tsconfig.node.json
@@ -1,5 +1,5 @@
 {
-  "extends": ["@tsconfig/node24/tsconfig.json", "@vue/tsconfig/tsconfig.json"],
+  "extends": "@vue/tsconfig/tsconfig.json",
   "include": ["vite.config.*", "vitest.config.*"],
   "compilerOptions": {
     "composite": true,
diff --git a/client/tsconfig.vitest.json b/client/tsconfig.vitest.json
index 7d281106..095224a7 100644
--- a/client/tsconfig.vitest.json
+++ b/client/tsconfig.vitest.json
@@ -4,7 +4,8 @@
   "compilerOptions": {
     "composite": true,
     "types": ["node", "jsdom"],
-    "lib": ["es2022"],
-    "target": "es2022"
+    "lib": ["es2022", "DOM", "DOM.Iterable"],
+    "target": "es2022",
+    "allowJs": true
   }
 }
diff --git a/client/vite.config.ts b/client/vite.config.ts
index 2ed7f0a0..1b4186d1 100644
--- a/client/vite.config.ts
+++ b/client/vite.config.ts
@@ -47,10 +47,10 @@ export default defineConfig({
     }
   },
   test: {
-    setupFiles: ['tests/vitest-setupfiles/setup-jest-dom.js', 'jsdom-worker'],
+    setupFiles: ['tests/vitest-setupfiles/setup-jest-dom.ts', 'jsdom-worker'],
     environment: 'jsdom',
     globals: true,
-    exclude: ['node_modules', 'dist', "dist_random"],
+    exclude: ['node_modules', 'dist'],
     coverage: {
       enabled: false,
       include: ['src/**/*'],