🏗️ Migrerer fra Next.js til Vite react

Co-authored-by: Øydis Kind Refsum <oydis.kind.refsum@nav.no>
Co-authored-by: Christian Bulow Skovborg <christian.bulow.skovborg@nav.no>
Co-authored-by: Amalie Mansåker <amalie.erdal.mansaker@nav.no>
Co-authored-by: Sindre Kjelsrud <sindre.kjelsrud@nav.no>

frontend/tsconfig.json

@@ -1,26 +1,25 @@
 {
   "compilerOptions": {
-    "target": "es5",
-    "lib": ["dom", "dom.iterable", "esnext"],
-    "allowJs": true,
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
     "skipLibCheck": true,
-    "strict": true,
-    "forceConsistentCasingInFileNames": true,
-    "noEmit": true,
-    "esModuleInterop": true,
-    "module": "esnext",
-    "moduleResolution": "node",
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "preserve",
-    "incremental": true,
-    "paths": {
-      "@/*": ["./*"]
-    }
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
   },
-  "include": [
-    "next-env.d.ts", "**/*.ts", "**/*.tsx"],
-  "exclude": [
-    "../frontend/node_modules"
-  ]
+  "include": ["src"],
+  "references": [{ "path": "./tsconfig.node.json" }]
 }