feat(nuxi): add typecheck command using vue-tsc (#2132)

* feat(nuxi): add `typecheck` command using `vue-tsc`

* perf: use local install with execa + set rootDir as cwd

docs/content/1.getting-started/5.commands.md

@@ -73,3 +73,11 @@ To upgrade Nuxt3 version:
 ```bash
 npx nuxi upgrade
 ```
+
+## Checking types
+
+To type-check your application, you can use `nuxi typecheck`. This uses [`vue-tsc`](https://github.com/johnsoncodehk/volar/tree/master/packages/vue-tsc) under the hood. If you have both a locally installed version of `typescript` and `vue-tsc`, nuxi will use these when type-checking.
+
+```bash
+npx nuxi typecheck
+```

docs/content/2.concepts/3.typescript.md

@@ -4,10 +4,10 @@ Nuxt 3 is fully typed and provides helpful shortcuts to ensure you have access t
 
 ## Type-checking
 
-By default, Nuxt doesn't check types when you run `nuxi dev` or `nuxi build`, for performance reasons. However, you can manually check your types using [`vue-tsc`](https://github.com/johnsoncodehk/volar/tree/master/packages/vue-tsc).
+By default, Nuxt doesn't check types when you run `nuxi dev` or `nuxi build`, for performance reasons. However, you can [manually check your types with nuxi](/getting-started/commands).
 
 ```bash
-npx vue-tsc --noEmit
+yarn nuxi typecheck
 ```
 
 ## Auto-generated types

packages/nuxi/src/commands/index.ts

@@ -8,6 +8,7 @@ export const commands = {
   analyze: () => import('./analyze').then(_rDefault),
   generate: () => import('./generate').then(_rDefault),
   prepare: () => import('./prepare').then(_rDefault),
+  typecheck: () => import('./typecheck').then(_rDefault),
   usage: () => import('./usage').then(_rDefault),
   info: () => import('./info').then(_rDefault),
   init: () => import('./init').then(_rDefault),

packages/nuxi/src/commands/typecheck.ts

@@ -0,0 +1,34 @@
+import { execa } from 'execa'
+import { resolve } from 'pathe'
+import { tryResolveModule } from '../utils/cjs'
+
+import { loadKit } from '../utils/kit'
+import { writeTypes } from '../utils/prepare'
+import { defineNuxtCommand } from './index'
+
+export default defineNuxtCommand({
+  meta: {
+    name: 'typecheck',
+    usage: 'npx nuxi typecheck [rootDir]',
+    description: 'Runs `vue-tsc` to check types throughout your app.'
+  },
+  async invoke (args) {
+    process.env.NODE_ENV = process.env.NODE_ENV || 'production'
+    const rootDir = resolve(args._[0] || '.')
+
+    const { loadNuxt } = await loadKit(rootDir)
+    const nuxt = await loadNuxt({ rootDir, config: { _prepare: true } })
+
+    // Generate types and close nuxt instance
+    await writeTypes(nuxt)
+    await nuxt.close()
+
+    // Prefer local install if possible
+    const hasLocalInstall = tryResolveModule('typescript', rootDir) && tryResolveModule('vue-tsc/package.json', rootDir)
+    if (hasLocalInstall) {
+      await execa('vue-tsc', ['--noEmit'], { preferLocal: true, stdio: 'inherit', cwd: rootDir })
+    } else {
+      await execa('npx', '-p vue-tsc -p typescript vue-tsc --noEmit'.split(' '), { stdio: 'inherit', cwd: rootDir })
+    }
+  }
+})

packages/schema/src/config/_internal.ts

@@ -10,6 +10,8 @@ export default {
   /** @private */
   _generate: false,
   /** @private */
+  _prepare: false,
+  /** @private */
   _cli: false,
   /** @private */
   _requiredModules: {},