diff --git a/packages/nitro/package.json b/packages/nitro/package.json
index 354269d3dc..8a27bef2e3 100644
--- a/packages/nitro/package.json
+++ b/packages/nitro/package.json
@@ -83,5 +83,12 @@
     "vue": "3.0.11",
     "vue-bundle-renderer": "^0.2.3",
     "vue-server-renderer": "^2.6.12"
+  },
+  "devDependencies": {
+    "@types/debounce": "^1.2.0",
+    "@types/fs-extra": "^9.0.10",
+    "@types/http-proxy": "^1.17.5",
+    "@types/node-fetch": "^2.5.9",
+    "@types/serve-static": "^1.13.9"
   }
 }
diff --git a/packages/nitro/src/build.ts b/packages/nitro/src/build.ts
index f6ea30f02e..a94bfe4784 100644
--- a/packages/nitro/src/build.ts
+++ b/packages/nitro/src/build.ts
@@ -81,7 +81,7 @@ async function _build (nitroContext: NitroContext) {
 
 function startRollupWatcher (nitroContext: NitroContext) {
   const watcher = rollupWatch(nitroContext.rollupConfig)
-  let start
+  let start: number
 
   watcher.on('event', (event) => {
     switch (event.code) {
diff --git a/packages/nitro/src/runtime/types.d.ts b/packages/nitro/src/runtime/types.d.ts
index 902e786658..8edd170b81 100644
--- a/packages/nitro/src/runtime/types.d.ts
+++ b/packages/nitro/src/runtime/types.d.ts
@@ -1,6 +1,11 @@
-declare module NodeJS {
-  interface Global {
-    __timing__: any
-    $config: any
+declare global {
+  namespace NodeJS {
+    interface Global {
+      __timing__: any
+      $config: any
+    }
   }
 }
+
+// type export required to turn this into a module for TS augmentation purposes
+export type A = {}
diff --git a/packages/nitro/src/server/dev.ts b/packages/nitro/src/server/dev.ts
index 3b7873678d..053102f253 100644
--- a/packages/nitro/src/server/dev.ts
+++ b/packages/nitro/src/server/dev.ts
@@ -1,21 +1,24 @@
 import { Worker } from 'worker_threads'
-import { createApp } from 'h3'
-import { resolve } from 'upath'
+
+import chokidar, { FSWatcher } from 'chokidar'
+import type { Server } from 'connect'
 import debounce from 'debounce'
-import chokidar from 'chokidar'
-import { listen, Listener } from 'listhen'
-import serveStatic from 'serve-static'
-import servePlaceholder from 'serve-placeholder'
-import { createProxy } from 'http-proxy'
 import { stat } from 'fs-extra'
+import { createApp, Middleware } from 'h3'
+import { createProxy } from 'http-proxy'
+import { listen, Listener, ListenOptions } from 'listhen'
+import servePlaceholder from 'serve-placeholder'
+import serveStatic from 'serve-static'
+import { resolve } from 'upath'
 import type { NitroContext } from '../context'
+import type { ServerMiddleware } from './middleware'
 
 export function createDevServer (nitroContext: NitroContext) {
   // Worker
   const workerEntry = resolve(nitroContext.output.dir, nitroContext.output.serverDir, 'index.js')
-  let pendingWorker: Worker
+  let pendingWorker: Worker | null
   let activeWorker: Worker
-  let workerAddress: string
+  let workerAddress: string | null
   async function reload () {
     if (pendingWorker) {
       await pendingWorker.terminate()
@@ -68,7 +71,7 @@ export function createDevServer (nitroContext: NitroContext) {
   const proxy = createProxy()
   app.use((req, res) => {
     if (workerAddress) {
-      proxy.web(req, res, { target: workerAddress }, (_err) => {
+      proxy.web(req, res, { target: workerAddress }, (_err: unknown) => {
         // console.error('[proxy]', err)
       })
     } else {
@@ -78,7 +81,7 @@ export function createDevServer (nitroContext: NitroContext) {
 
   // Listen
   let listeners: Listener[] = []
-  const _listen = async (port, opts?) => {
+  const _listen = async (port: ListenOptions['port'], opts?: Partial<ListenOptions>) => {
     const listener = await listen(app, { port, ...opts })
     listeners.push(listener)
     return listener
@@ -87,7 +90,7 @@ export function createDevServer (nitroContext: NitroContext) {
   // Watch for dist and reload worker
   const pattern = '**/*.{js,json}'
   const events = ['add', 'change']
-  let watcher
+  let watcher: FSWatcher
   function watch () {
     if (watcher) { return }
     const dReload = debounce(() => reload().catch(console.warn), 200, true)
@@ -123,17 +126,22 @@ export function createDevServer (nitroContext: NitroContext) {
   }
 }
 
-function createDynamicMiddleware () {
-  let middleware
+interface DynamicMiddleware {
+  set: (input: Middleware | ServerMiddleware[]) => void
+  middleware: Middleware
+}
+
+function createDynamicMiddleware (): DynamicMiddleware {
+  let middleware: Middleware
   return {
     set: (input) => {
       if (!Array.isArray(input)) {
         middleware = input
         return
       }
-      const app = require('connect')()
+      const app: Server = require('connect')()
       for (const m of input) {
-        app.use(m.path || m.route || '/', m.handler || m.handle)
+        app.use(m.path || m.route || '/', m.handler || m.handle!)
       }
       middleware = app
     },
diff --git a/packages/nitro/src/server/middleware.ts b/packages/nitro/src/server/middleware.ts
index 6c81e90cb3..18adec1fc3 100644
--- a/packages/nitro/src/server/middleware.ts
+++ b/packages/nitro/src/server/middleware.ts
@@ -2,11 +2,22 @@ import { resolve, join, extname } from 'upath'
 import { joinURL } from 'ufo'
 import globby from 'globby'
 import { watch } from 'chokidar'
+import type { Middleware } from 'h3'
 import { tryResolvePath, Nuxt } from '@nuxt/kit'
 
 export interface ServerMiddleware {
   route: string
-  handle: string
+  /**
+   * @deprecated use route
+   */
+  path?: string
+
+  handle?: Middleware
+  /**
+   * @deprecated use handle
+   */
+  handler?: Middleware
+
   lazy?: boolean // Default is true
   promisify?: boolean // Default is true
 }
diff --git a/packages/nitro/src/utils/index.ts b/packages/nitro/src/utils/index.ts
index 4f48b57d57..50d9682597 100644
--- a/packages/nitro/src/utils/index.ts
+++ b/packages/nitro/src/utils/index.ts
@@ -44,7 +44,7 @@ export function tryImport (dir: string, path: string) {
   } catch (_err) { }
 }
 
-export async function writeFile (file, contents, log = false) {
+export async function writeFile (file: string, contents: string, log = false) {
   await fse.mkdirp(dirname(file))
   await fse.writeFile(file, contents, 'utf-8')
   if (log) {
@@ -52,7 +52,7 @@ export async function writeFile (file, contents, log = false) {
   }
 }
 
-export function resolvePath (nitroContext: NitroInput, path: string | ((nitroContext) => string), resolveBase: string = ''): string {
+export function resolvePath (nitroContext: NitroInput, path: string | ((nitroContext: NitroInput) => string), resolveBase: string = ''): string {
   if (typeof path === 'function') {
     path = path(nitroContext)
   }
diff --git a/packages/nitro/src/utils/tree.ts b/packages/nitro/src/utils/tree.ts
index 2f20ad83f3..a70ea8239f 100644
--- a/packages/nitro/src/utils/tree.ts
+++ b/packages/nitro/src/utils/tree.ts
@@ -6,7 +6,7 @@ import { readFile } from 'fs-extra'
 import chalk from 'chalk'
 import stdenv from 'std-env'
 
-export async function printFSTree (dir) {
+export async function printFSTree (dir: string) {
   if (stdenv.test) {
     return
   }
diff --git a/yarn.lock b/yarn.lock
index ba7e87c684..bc82782458 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1772,7 +1772,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@nuxt/nitro@^0.2.0, @nuxt/nitro@workspace:packages/nitro":
+"@nuxt/nitro@^0.2.1, @nuxt/nitro@workspace:packages/nitro":
   version: 0.0.0-use.local
   resolution: "@nuxt/nitro@workspace:packages/nitro"
   dependencies:
@@ -1788,6 +1788,11 @@ __metadata:
     "@rollup/plugin-replace": ^2.4.2
     "@rollup/plugin-virtual": ^2.0.3
     "@rollup/pluginutils": ^4.1.0
+    "@types/debounce": ^1.2.0
+    "@types/fs-extra": ^9.0.10
+    "@types/http-proxy": ^1.17.5
+    "@types/node-fetch": ^2.5.9
+    "@types/serve-static": ^1.13.9
     "@vercel/nft": ^0.9.6
     "@vue/server-renderer": ^3.0.11
     archiver: ^5.3.0
@@ -2278,6 +2283,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/debounce@npm:^1.2.0":
+  version: 1.2.0
+  resolution: "@types/debounce@npm:1.2.0"
+  checksum: c45dbc5fa369b9d29616f994a83ca6833a82ebdabbb455a92fed3c292d0f15482e6ba76c8fed7ea3c947df398fd89754880e38d6a247323dac467241f7ae5be0
+  languageName: node
+  linkType: hard
+
 "@types/eslint-scope@npm:^3.7.0":
   version: 3.7.0
   resolution: "@types/eslint-scope@npm:3.7.0"
@@ -2312,6 +2324,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/fs-extra@npm:^9.0.10":
+  version: 9.0.10
+  resolution: "@types/fs-extra@npm:9.0.10"
+  dependencies:
+    "@types/node": "*"
+  checksum: 047a134510d86e1d5041a89d591a328392d62567b8d67d40f238fb3029dc08971f163798077ed0679870a6842381f05d50d14f75ae6b05b736cb18ece0eb7f4f
+  languageName: node
+  linkType: hard
+
 "@types/graceful-fs@npm:^4.1.2":
   version: 4.1.5
   resolution: "@types/graceful-fs@npm:4.1.5"
@@ -2321,6 +2342,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/http-proxy@npm:^1.17.5":
+  version: 1.17.5
+  resolution: "@types/http-proxy@npm:1.17.5"
+  dependencies:
+    "@types/node": "*"
+  checksum: 21aefcc88273cb99474a7682209c795ee0dad15cc277b027ea504e65faab5cbb799b067662f7ae7c0255651bf9433a41811930c76f7561757f02f2c8262ee592
+  languageName: node
+  linkType: hard
+
 "@types/istanbul-lib-coverage@npm:*, @types/istanbul-lib-coverage@npm:^2.0.0, @types/istanbul-lib-coverage@npm:^2.0.1":
   version: 2.0.3
   resolution: "@types/istanbul-lib-coverage@npm:2.0.3"
@@ -2370,6 +2400,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/mime@npm:^1":
+  version: 1.3.2
+  resolution: "@types/mime@npm:1.3.2"
+  checksum: c354bc135628c2f4ab64801ca3867c3acbd4050611579c4c9f5bdfecfb70db71bb8540bf8611b4319f5ef44139c5f7c5af81254369add5ed59e7e02ce929b96f
+  languageName: node
+  linkType: hard
+
 "@types/mime@npm:^2.0.2":
   version: 2.0.3
   resolution: "@types/mime@npm:2.0.3"
@@ -2391,6 +2428,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/node-fetch@npm:^2.5.9":
+  version: 2.5.9
+  resolution: "@types/node-fetch@npm:2.5.9"
+  dependencies:
+    "@types/node": "*"
+    form-data: ^3.0.0
+  checksum: 0c25139d135382dfe6c63bcbfc059d29350a3d950a258d4611f13180e207926d68b07bd3d1937e6eb4a98213a6da1aa285cc94167b9cf67e41d4634d3d2f5b3b
+  languageName: node
+  linkType: hard
+
 "@types/node@npm:*":
   version: 14.14.35
   resolution: "@types/node@npm:14.14.35"
@@ -2442,6 +2489,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/serve-static@npm:^1.13.9":
+  version: 1.13.9
+  resolution: "@types/serve-static@npm:1.13.9"
+  dependencies:
+    "@types/mime": ^1
+    "@types/node": "*"
+  checksum: f261127514057b5c038d76259128d7b765dd92bfeaf769d05b8ddf5f254d066ce6142a935e2fc707bb3009d6544a979591852f0d135d0ed4d0c56db08738df6b
+  languageName: node
+  linkType: hard
+
 "@types/source-list-map@npm:*":
   version: 0.1.2
   resolution: "@types/source-list-map@npm:0.1.2"
@@ -4489,7 +4546,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"combined-stream@npm:^1.0.6, combined-stream@npm:~1.0.6":
+"combined-stream@npm:^1.0.6, combined-stream@npm:^1.0.8, combined-stream@npm:~1.0.6":
   version: 1.0.8
   resolution: "combined-stream@npm:1.0.8"
   dependencies:
@@ -6648,6 +6705,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"form-data@npm:^3.0.0":
+  version: 3.0.1
+  resolution: "form-data@npm:3.0.1"
+  dependencies:
+    asynckit: ^0.4.0
+    combined-stream: ^1.0.8
+    mime-types: ^2.1.12
+  checksum: 6574ff4d2d845c47ba288151a6e0573767eefdee9da358be199e0f0b66aa5c454e7d62ed5e0daef6f84167ba1e9596e064f36f206488e460ef449ef7b653cdfc
+  languageName: node
+  linkType: hard
+
 "form-data@npm:~2.3.2":
   version: 2.3.3
   resolution: "form-data@npm:2.3.3"
@@ -10368,7 +10436,7 @@ __metadata:
   dependencies:
     "@nuxt/app": ^0.2.0
     "@nuxt/kit": ^0.2.0
-    "@nuxt/nitro": ^0.2.0
+    "@nuxt/nitro": ^0.2.1
     "@nuxt/vite-builder": ^0.1.1
     "@nuxt/webpack-builder": ^0.1.1
     chokidar: ^3.5.1