feat: preliminary vue-app types

packages/nuxt3/src/vue-app/declarations/node.d.ts

@@ -0,0 +1,10 @@
+declare module NodeJS {
+    interface Process {
+        browser: boolean
+        client: boolean
+        mode: 'spa' | 'universal'
+        modern: boolean
+        server: boolean
+        static: boolean
+    }
+}

packages/nuxt3/src/vue-app/declarations/nuxt-build.d.ts

@@ -0,0 +1,6 @@
+declare module 'nuxt-build/routes' {
+    import { RouteRecordRaw } from 'vue-router'
+
+    const _default: RouteRecordRaw[]
+    export default _default
+}

packages/nuxt3/src/vue-app/declarations/window.d.ts

@@ -0,0 +1,3 @@
+interface Window {
+    __NUXT__?: Record<string, any>
+}

packages/nuxt3/src/vue-app/nuxt.ts

@@ -1,28 +1,54 @@
+import type { IncomingMessage, ServerResponse } from 'http'
 import Hookable from 'hookable'
+import type { App } from 'vue'
+
+import type { Plugin } from './types'
 import { defineGetter } from './utils'
 
-class Nuxt extends Hookable {
-  constructor ({ app, ssrContext, globalName }) {
+export class Nuxt extends Hookable {
+  app: App<Element>
+  ssrContext?: Record<string, any>
+  globalName: string
+  context: {
+    req?: IncomingMessage
+    res?: ServerResponse
+  }
+
+  constructor({ app, ssrContext, globalName }: { app: Nuxt['app'], ssrContext?: Nuxt['ssrContext'], globalName: Nuxt['globalName'] }) {
     super()
     this.app = app
     this.ssrContext = ssrContext
     this.globalName = globalName
   }
 
-  provide (name, value) {
+  provide(name: string, value: any) {
     const $name = '$' + name
     defineGetter(this.app, $name, value)
     defineGetter(this.app.config.globalProperties, $name, value)
   }
 }
 
-export async function init ({ app, plugins, ssrContext, globalName = 'nuxt' }) {
+interface InitOptions {
+  app: Nuxt['app']
+  plugins?: Plugin[]
+  ssrContext?: Nuxt['ssrContext']
+  globalName?: Nuxt['globalName']
+}
+
+export async function init({ app, plugins, ssrContext, globalName = 'nuxt' }: InitOptions) {
   const nuxt = new Nuxt({ app, ssrContext, globalName })
   nuxt.provide('nuxt', nuxt)
 
-  const inject = nuxt.provide.bind(nuxt)
+  const inject: Nuxt['provide'] = nuxt.provide.bind(nuxt)
 
   for (const plugin of plugins) {
     await plugin(nuxt, inject)
   }
 }
+
+
+declare module 'vue' {
+  interface App {
+    $nuxt: Nuxt
+  }
+}

packages/nuxt3/src/vue-app/plugins/components.ts

@@ -1,3 +1,5 @@
+import type { Plugin } from 'nuxt/vue-app/types'
+
 // import { h, defineComponent } from 'vue'
 import { RouterLink } from 'vue-router'
 
@@ -5,7 +7,9 @@ import { RouterLink } from 'vue-router'
 //   extends: Link
 // })
 
-export default function components ({ app }) {
+const components: Plugin = function ({ app }) {
   app.component('NuxtLink', RouterLink)
   app.component('NLink', RouterLink) // TODO: deprecate
 }
+
+export default components

packages/nuxt3/src/vue-app/plugins/legacy.ts

@@ -1,8 +1,11 @@
-export default function legacy ({ app }) {
+import type { App } from 'vue'
+import type { Plugin } from 'nuxt/vue-app/types'
+
+const legacy: Plugin = function ({ app }) {
   app.$nuxt.context = {}
 
   if (process.client) {
-    const legacyApp = { ...app }
+    const legacyApp: App<Element> & { $root?: App<Element> } = { ...app }
     legacyApp.$root = legacyApp
     window[app.$nuxt.globalName] = legacyApp
   }
@@ -13,3 +16,5 @@ export default function legacy ({ app }) {
     app.$nuxt.context.res = ssrContext.res
   }
 }
+
+export default legacy

packages/nuxt3/src/vue-app/plugins/preload.ts

@@ -1,4 +1,6 @@
-export default function preload ({ app }) {
+import type { Plugin } from 'nuxt/vue-app/types'
+
+const preload: Plugin = function ({ app }) {
   app.mixin({
     beforeCreate() {
       const { _registeredComponents } = this.$nuxt.ssrContext
@@ -7,3 +9,5 @@ export default function preload ({ app }) {
     }
   })
 }
+
+export default preload

packages/nuxt3/src/vue-app/plugins/router.ts

@@ -1,9 +1,11 @@
 import { ref } from 'vue'
 import { createRouter, createWebHistory, createMemoryHistory } from 'vue-router'
 
+import type { Plugin } from 'nuxt/vue-app/types'
+
 import routes from 'nuxt-build/routes'
 
-export default function router ({ app }) {
+const router: Plugin = function ({ app }) {
   const routerHistory = process.client
     ? createWebHistory()
     : createMemoryHistory()
@@ -35,3 +37,5 @@ export default function router ({ app }) {
     })
   }
 }
+
+export default router

packages/nuxt3/src/vue-app/plugins/state.ts

@@ -1,4 +1,6 @@
-export default function state ({ app }) {
+import type { Plugin } from 'nuxt/vue-app/types'
+
+const state: Plugin = function ({ app }) {
   if (process.server) {
     app.$nuxt.state = {
       serverRendered: true
@@ -11,3 +13,5 @@ export default function state ({ app }) {
     app.$nuxt.state = window.__NUXT__ || {}
   }
 }
+
+export default state

packages/nuxt3/src/vue-app/types.ts

@@ -0,0 +1,5 @@
+import type { Nuxt } from './nuxt';
+
+export interface Plugin {
+    (nuxt: Nuxt, inject?: Nuxt['provide']): Promise<void> | void
+}

packages/nuxt3/src/vue-app/utils.ts

@@ -1,3 +1,3 @@
-export function defineGetter (obj, key, val) {
+export function defineGetter<K extends string | number | symbol, V> (obj: Record<K, V>, key: K, val: V) {
   Object.defineProperty(obj, key, { get: () => val })
 }