feat(nuxt): support separate server tsconfig (#20559)

packages/nuxt/src/core/nitro.ts

@@ -92,7 +92,9 @@ export async function initNitro (nuxt: Nuxt & { _nitro?: Nitro }) {
       layer => resolve(layer.config.srcDir, 'app.config')
     ),
     typescript: {
-      generateTsConfig: false
+      strict: true,
+      generateTsConfig: true,
+      tsconfigPath: 'tsconfig.server.json'
     },
     publicAssets: [
       nuxt.options.dev

test/fixtures/basic/server/api/useAsyncData/count.ts

@@ -1,3 +1,9 @@
 let counter = 0
 
+const test = () => () => {
+  // TODO: useNuxtApp should be undefined when type-testing a nitro route
+  useNuxtApp()
+}
+test()
+
 export default defineEventHandler(() => ({ count: counter++ }))

test/fixtures/basic/server/tsconfig.json

@@ -0,0 +1,3 @@
+{
+  "extends": "../.nuxt/tsconfig.server.json"
+}