Add check for now.json and custom server (#9346)

* Check if the user has a now.json

* Check for now.json

* Add check for custom server

packages/next/build/index.ts

@@ -6,7 +6,7 @@ import mkdirpOrig from 'mkdirp'
 import nanoid from 'next/dist/compiled/nanoid/index.js'
 import path from 'path'
 import { promisify } from 'util'
-
+import findUp from 'find-up'
 import formatWebpackMessages from '../client/dev/error-overlay/format-webpack-messages'
 import { PUBLIC_DIR_MIDDLEWARE_CONFLICT } from '../lib/constants'
 import { findPagesDir } from '../lib/find-pages-dir'
@@ -125,6 +125,8 @@ export default async function build(dir: string, conf = null): Promise<void> {
       eventVersion({
         cliCommand: 'build',
         isSrcDir: path.relative(dir, pagesDir!).startsWith('src'),
+        hasNowJson: !!(await findUp('now.json', { cwd: dir })),
+        isCustomServer: null,
       })
     ),
     eventNextPlugins(path.resolve(dir)).then(events => telemetry.record(events))

packages/next/cli/next-dev.ts

 #!/usr/bin/env node
-import { resolve, join } from 'path'
+import { resolve } from 'path'
 import arg from 'next/dist/compiled/arg/index.js'
 import { existsSync } from 'fs'
 import startServer from '../server/lib/start-server'
@@ -57,7 +57,11 @@ const nextDev: cliCommand = argv => {
 
   startedDevelopmentServer(appUrl)
 
-  startServer({ dir, dev: true }, port, args['--hostname'])
+  startServer(
+    { dir, dev: true, isNextDevCommand: true },
+    port,
+    args['--hostname']
+  )
     .then(async app => {
       await app.prepare()
     })

packages/next/export/index.ts

@@ -5,7 +5,7 @@ import mkdirpModule from 'mkdirp'
 import { cpus } from 'os'
 import { dirname, join, resolve, sep } from 'path'
 import { promisify } from 'util'
-
+import findUp from 'find-up'
 import { AmpPageStatus, formatAmpMessages } from '../build/output/index'
 import createSpinner from '../build/spinner'
 import { API_ROUTE } from '../lib/constants'
@@ -95,7 +95,14 @@ export default async function(
   const distDir = join(dir, nextConfig.distDir)
   if (!options.buildExport) {
     const telemetry = new Telemetry({ distDir })
-    telemetry.record(eventVersion({ cliCommand: 'export', isSrcDir: null }))
+    telemetry.record(
+      eventVersion({
+        cliCommand: 'export',
+        isSrcDir: null,
+        hasNowJson: !!(await findUp('now.json', { cwd: dir })),
+        isCustomServer: null,
+      })
+    )
   }
 
   const subFolders = nextConfig.exportTrailingSlash

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

@@ -6,7 +6,7 @@ import React from 'react'
 import { UrlWithParsedQuery } from 'url'
 import { promisify } from 'util'
 import Watchpack from 'watchpack'
-
+import findUp from 'find-up'
 import { ampValidation } from '../build/output/index'
 import * as Log from '../build/output/log'
 import { PUBLIC_DIR_MIDDLEWARE_CONFLICT } from '../lib/constants'
@@ -41,8 +41,9 @@ export default class DevServer extends Server {
   private setDevReady?: Function
   private webpackWatcher?: Watchpack | null
   private hotReloader?: HotReloader
+  private isCustomServer: boolean
 
-  constructor(options: ServerConstructor) {
+  constructor(options: ServerConstructor & { isNextDevCommand?: boolean }) {
     super({ ...options, dev: true })
     this.renderOpts.dev = true
     ;(this.renderOpts as any).ErrorDebug = ErrorDebug
@@ -69,6 +70,7 @@ export default class DevServer extends Server {
         `The static directory has been deprecated in favor of the public directory. https://err.sh/zeit/next.js/static-dir-deprecated`
       )
     }
+    this.isCustomServer = !options.isNextDevCommand
     this.pagesDir = findPagesDir(this.dir)
   }
 
@@ -211,6 +213,8 @@ export default class DevServer extends Server {
       eventVersion({
         cliCommand: 'dev',
         isSrcDir: relative(this.dir, this.pagesDir!).startsWith('src'),
+        hasNowJson: !!(await findUp('now.json', { cwd: this.dir })),
+        isCustomServer: this.isCustomServer,
       })
     )
   }

packages/next/telemetry/events/version.ts

@@ -5,6 +5,8 @@ type EventCliSessionStarted = {
   nodeVersion: string
   cliCommand: string
   isSrcDir: boolean | null
+  hasNowJson: boolean
+  isCustomServer: boolean | null
 }
 
 export function eventVersion(
@@ -23,6 +25,8 @@ export function eventVersion(
         nodeVersion: process.version,
         cliCommand: event.cliCommand,
         isSrcDir: event.isSrcDir,
+        hasNowJson: event.hasNowJson,
+        isCustomServer: event.isCustomServer,
       } as EventCliSessionStarted,
     },
   ]