Using Typescript to incorporate Next.js on Firebase Functions

I'm currently working on deploying a Next.js application to Firebase Functions.

import next from 'next'
import {https} from 'firebase-functions'

const server = next({
  dev: process.env.NODE_ENV !== 'production',
  conf: {distDir: '.next'}
})

const nextjsHandler = server.getRequestHandler()

exports.app = https.onRequest(async (req, res) => {
  await server.prepare()
  return await nextjsHandler(req, res)
})

The issue I'm facing is related to Typescript error messages appearing in the code:

  1. An error is displayed for the line conf: {distDir: '.next'}, showing:

    Type '{ distDir: string; }' is not assignable to type 'NextConfig'.

  2. Another error is shown for the line 

    return await nextjsHandler(req, res)
    , specifically concerning the res parameter:

    Type error: Argument of type 'Response<any>' is not assignable to parameter of type 'ServerResponse'. Property 'req' is optional in type 'Response<any>' but required in type 'ServerResponse'.

If anyone has any insights or suggestions on how to resolve these two errors, it would be greatly appreciated. Thank you!

typescriptfirebasegoogle-cloud-functionsnext.js

Answer №1

  • Upon reviewing your code, it appears that you are referencing either this blog or this github link for guidance on deploying your Next JS application to Firebase Function.
  • I followed both resources and initially encountered an error in the function code due to the usage of 
    const isDev = process.env.NODE_ENV !== 'production';
    . However, after referring to the blog, I realized that there were no environment variables set up in the application, causing the issue.
  • To resolve this, I added an empty .env file and a .env.sample file as per the instructions outlined here. Subsequently, I was able to deploy the function successfully without encountering any further errors.
  • Other than the aforementioned issue, I did not identify any errors in the provided code snippet.

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