Caution: An invalid next.config.js file has been detected while running the Next.js project

Whenever I try to run my project, I encounter the following three warnings:

1-
warn  - We found some invalid options in your next.config.js file. The property webpack5 is not recognized and may cause issues (allowed properties are: amp, analyticsId, assetPrefix, basePath, cleanDistDir, compiler, compress, crossOrigin, devIndicators, distDir, env, eslint, excludeDefaultMomentLocales, experimental, exportPathMap, future, generateBuildId, generateEtags, headers, httpAgentOptions, i18n, images, onDemandEntries, optimizeFonts, output, outputFileTracing, pageExtensions, poweredByHeader, productionBrowserSourceMaps, publicRuntimeConfig, reactStrictMode, redirects, rewrites, sassOptions, serverRuntimeConfig, staticPageGenerationTimeout, swcMinify, trailingSlash, typescript, useFileSystemPublicRoutes, webpack).

2-
warn  - Fast Refresh required a full reload. More information available at: https://nextjs.org/docs/basic-features/fast-refresh#how-it-works

3-
warn  - Dependency issue with ./node_modules/next-i18next/dist/commonjs/serverSideTranslations.js. The request of a dependency is treated as an expression.

This is how my next.config.js looks like:

const {i18n} = require('./next-i18next.config')
const withVideos = require('next-videos')
module.exports = withVideos({
  reactStrictMode : true,
  i18n,
  webpack5: true,
  webpack: (config) => {
    config.resolve.fallback = { fs: false };

    return config;
  },
})

I also attempted this configuration:

/**
 * @type {import('next').NextConfig}
 */
 const {i18n} = require('./next-i18next.config')
 const withVideos = require('next-videos')

 const nextConfig = {
  reactStrictMode : true,
  i18n,
  webpack5: true,
  webpack: (config) => {
    config.resolve.fallback = { fs: false };

    return config;
  },
}

module.exports = withVideos(nextConfig)

However, the outcome remained unchanged.

Answer №1

Maybe this solution will be helpful to you.

I encountered a similar issue with Google's "autoComplete" feature:

"The root value has an unexpected property, autoComplete, which is not in the list of allowed properties (amp, ..."

To resolve this, I encapsulated it within an "env" object like so:

const nextConfig = {
  ...
  i18n: {
    ...
  },
  env: {
    ...
    autoComplete: {
      publicApiKey: '...',
    },
  },
  ...
}

After restarting my application, the warning disappeared.

Answer №2

This is the main configuration file for your Next.js project

/** @type {import('next').NextConfig} */
    
    const nextConfig = {
      reactStrictMode: true,
      
    }
        
    module.exports = nextConfig

If you need to add additional packages to export, simply update the code within the nextConfig variable as shown below:

/** @type {import('next').NextConfig} */

const path = require('path')

const nextConfig = {
  reactStrictMode: true,
  sassOptions: {
    includePaths: [path.join(__dirname, 'styles')],
  },
}

module.exports = nextConfig

Hopefully, this information proves helpful. For more in-depth details, please refer to the official documentation available at https://nextjs.org/docs/messages/invalid-next-config

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