fix: improve type declarations (#1178)

packages/nitro/types/fetch.d.ts

@@ -23,7 +23,7 @@ export declare type TypedInternalResponse<Route, Default> =
         : MiddlewareOf<Route>
       : Default
 
-export declare interface $Fetch<DefaultT = unknown, DefaultR = FetchRequest> {
+export declare interface $Fetch<DefaultT = unknown, DefaultR extends FetchRequest = FetchRequest> {
   <T = DefaultT, R extends FetchRequest = DefaultR> (request: R, opts?: FetchOptions): Promise<TypedInternalResponse<R, T>>
   raw<T = DefaultT, R extends FetchRequest = DefaultR> (request: R, opts?: FetchOptions): Promise<FetchResponse<TypedInternalResponse<R, T>>>
 }
@@ -38,4 +38,4 @@ declare global {
   }
 }
 
-export default {}
+export { }

packages/nuxt3/src/app/types/augments.ts

@@ -0,0 +1,28 @@
+import { NuxtApp } from '../nuxt'
+
+declare global {
+  namespace NodeJS {
+    interface Process {
+      browser: boolean
+      client: boolean
+      dev: boolean
+      mode: 'spa' | 'universal'
+      server: boolean
+      static: boolean
+    }
+  }
+
+  interface Window {
+    __NUXT__?: Record<string, any>
+  }
+}
+
+declare module '@vue/runtime-core' {
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  interface App<HostElement> {
+    $nuxt: NuxtApp
+  }
+  interface ComponentInternalInstance {
+    _nuxtOnBeforeMountCbs: Function[]
+  }
+}

packages/nuxt3/src/app/types/index.d.ts

@@ -1,3 +1,4 @@
+import './augments'
 import './shims'
 
 // eslint-disable-next-line

packages/nuxt3/src/app/types/shims.d.ts

@@ -1,33 +1,6 @@
-import { Component } from '@vue/runtime-core'
+// https://github.com/vitejs/vite/blob/main/packages/create-vite/template-vue-ts/src/env.d.ts
-import { NuxtApp } from '../nuxt'
-
-declare global {
-  namespace NodeJS {
-    interface Process {
-      browser: boolean
-      client: boolean
-      dev: boolean
-      mode: 'spa' | 'universal'
-      server: boolean
-      static: boolean
-    }
-  }
-
-  interface Window {
-    __NUXT__?: Record<string, any>
-  }
-}
-
 declare module '*.vue' {
-  export default Component
+  import { DefineComponent } from '@vue/runtime-core'
-}
+  const component: DefineComponent<{}, {}, any>
-
+  export default component
-declare module '@vue/runtime-core' {
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  interface App<HostElement> {
-    $nuxt: NuxtApp
-  }
-  interface ComponentInternalInstance {
-    _nuxtOnBeforeMountCbs: Function[]
-  }
 }