Adding TypeScript description to next export (#7547)

* Adding Typescript description to next fixes #7529

* Change default export

* Improve typing for next

* Remove dev server typings

packages/next-server/server/next-server.ts

@@ -49,9 +49,18 @@ import { isBlockedPage, isInternalUrl } from './utils'
 type NextConfig = any
 
 export type ServerConstructor = {
+  /**
+   * Where the Next project is located - @default '.'
+   */
   dir?: string
   staticMarkup?: boolean
+  /**
+   * Hide error messages containing server information - @default false
+   */
   quiet?: boolean
+  /**
+   * Object what you would use in next.config.js - @default {}
+   */
   conf?: NextConfig
 }
 

packages/next/server/next-dev-server.js

@@ -14,8 +14,7 @@ import {
   getRouteRegex,
   getSortedRoutes
 } from 'next-server/dist/lib/router/utils'
-
-const React = require('react')
+import React from 'react'
 
 if (typeof React.Suspense === 'undefined') {
   throw new Error(

packages/next/server/next.d.ts

-export default function(options: any): any
+import Server, { ServerConstructor } from 'next-server/dist/server/next-server'
+
+type NextServerConstructor = Omit<ServerConstructor, 'staticMarkup'> & {
+  /**
+   * Whether to launch Next.js in dev mode - @default false
+   */
+  dev?: boolean
+}
+
+declare function next(opts: NextServerConstructor): Server
+
+export default next