Generic build error when updating from 10.2.4-canary.2 to any version above

[huggge]

What version of Next.js are you using?

10.2.4-canary.3

What version of Node.js are you using?

14.16.1

What browser are you using?

Chrome

What operating system are you using?

MacOs & Windows

How are you deploying your application?

next start

Describe the Bug

When using 10.2.4-canary.2 or earlier versions building works fine, but when upgrading to 10.2.4-canary.3 or any version above I get this very anonymously error. It do however work to start in dev

`

yarn build                        
yarn run v1.22.10
$ next build
info  - Loaded env from /Users/user/Desktop/dashboard/.env.local
info  - Using webpack 4. Reason: custom webpack configuration in next.config.js https://nextjs.org/docs/messages/webpack5
NODE ENV: production
info  - Checking validity of types  
To use ESLint, additional required package(s) must be installed.

Please install eslint-config-next by running:

        yarn add --dev eslint-config-next

If you do not want to run ESLint during builds, run next build --no-lint or remove the .eslintrc.json file from your package root.

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

`

This is happening in two separate projects and I have tried building them on both macOs and Windows, but dont even know where to start debugging with this very generic build error.

Does anyone have a clue of what could be causing this? I've narrowed it down to 10.2.4-canary.3

Lord please..!

Expected Behavior

Should be able to build project with never version than 10.2.4-canary.2

To Reproduce

Update to 10.2.4-canary.3 and try to build

[advaiyalad]

@huggge Either run yarn add -D eslint-config-next (to add next.js eslint config), or run yarn build --no-lint to not run linting on builds. Or, lastly, remove the eslint config from your package root.

If you install eslint-config-next, you also want to add { "extends": ["next", "next/core-web-vitals"] } to your .eslintrc.json file.

[housseindjirdeh]

@PythonCreator27 is correct, you'll have to do one of the following:

• Install eslint-config-next and it to your config like @PythonCreator27 mentioned
• Disable ESLint from running in builds using ignoreDuringBuilds in your next config (See: https://nextjs.org/docs/api-reference/next.config.js/ignoring-eslint)
• Run builds using the --no-lint flag (i.e.next build --no-lint)

Note: I have a PR open that improves the developer experience and does not require eslint-config-next to be installed. Once that lands, you'll never see this error message again - but in the meantime you'll have to do one of the above :)

[huggge]

Thanks for the help guys!

[balazsorban44]

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