From 402b52ccbf043d5103746e09a4bf38c3ecd81fd5 Mon Sep 17 00:00:00 2001
From: Simen Bekkhus <sbekkhus91@gmail.com>
Date: Thu, 22 Oct 2020 10:13:34 +0200
Subject: [PATCH] fix: add `use` to types (#9)

---
 README.md           | 6 +++++-
 index.d.ts          | 7 ++++++-
 test/types/index.ts | 4 ++++
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index cc2856f..413a286 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 This plugin adds full [Express](http://expressjs.com) compatibility to Fastify, it exposes the same `use` function of Express, and it allows you to use any Express middleware or application.<br/>
 
-| **Note**   |  This plugin should not be used as a long-term solution, it aims to help you have a smooth transition from Express to Fastify, but you should migrate your Express specific code to Fastify during time.  |
+| **Note**   |  This plugin should not be used as a long-term solution, it aims to help you have a smooth transition from Express to Fastify, but you should migrate your Express specific code to Fastify over time.  |
 | ----   |  :----  |
 
 ## Install
@@ -144,6 +144,10 @@ async function subsystem (fastify, opts) {
 }
 ```
 
+## TypeScript support
+
+To use this module with TypeScript, make sure to install `@types/express`.
+
 ## Middlewares alternatives
 
 Fastify offers some alternatives to the most commonly used middlewares, following, you can find a list.
diff --git a/index.d.ts b/index.d.ts
index 55f429c..42fb81a 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,8 +1,13 @@
 import { Application } from 'express'
 import { FastifyPluginCallback } from 'fastify'
 
-declare module "fastify" {
+declare module 'fastify' {
   interface FastifyInstance {
+    /**
+     * Express middleware function
+     */
+    use: Application['use']
+
     /**
      * Express application instance
      */
diff --git a/test/types/index.ts b/test/types/index.ts
index a98270b..996bc1c 100644
--- a/test/types/index.ts
+++ b/test/types/index.ts
@@ -6,3 +6,7 @@ const app = Fastify()
 app.register(fastifyExpress)
 
 app.express.disable('x-powered-by')
+
+app.use('/world', (_req, res) => {
+  res.sendStatus(200)
+})