Vague error in Vercel deployment (exit with code 1) - next.js

Question

So normally Vercel gives me decent error messages, but this one seems to have no detail. Just
"failed with exit code 1".
For context, I just started this project w the basic NextJS template, made a few modifications, and this is my first deploy.
Failed once and I assumed it was because NextJS has strict type checking on by default, so I modified the next.config.js file as follows (per here):
module.exports = {
typescript: {
// !! WARN !!
// Dangerously allow production builds to successfully complete even if
// your project has type errors.
// !! WARN !!
ignoreBuildErrors: true,
},
};
But still failed. Here is the full log:
10:23:27.575 Cloning github.com/lawderp/physical (Branch: main, Commit: 8f97554)
10:23:28.589 Cloning completed: 1.014s
10:23:28.614 Analyzing source code...
10:23:29.739 Installing build runtime...
10:23:31.612 Build runtime installed: 1.873s
10:23:34.043 Looking up build cache...
10:23:34.164 Build cache found. Downloading...
10:23:35.100 Build cache downloaded [21.48 MB]: 936.007ms
10:23:36.250 Installing dependencies...
10:23:36.489 yarn install v1.22.11
10:23:36.547 [1/4] Resolving packages...
10:23:36.734 success Already up-to-date.
10:23:36.743 Done in 0.26s.
10:23:36.754 Detected Next.js version: 11.1.2
10:23:36.755 Running "yarn run build"
10:23:37.021 yarn run v1.22.11
10:23:37.047 $ next build
10:23:37.820 info - Using webpack 5. Reason: Enabled by default https://nextjs.org/docs/messages/webpack5
10:23:37.976 info - Skipping validation of types...
10:23:40.439 error Command failed with exit code 1.
10:23:40.439 info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
10:23:40.456 Error: Command "yarn run build" exited with 1

Answer 1

Still not sure what the issue was but eventually figured out how to get past this - ignored ESLint during build by adding the following to next.config.js:
eslint: {
ignoreDuringBuilds: true,
},
(I don't advise doing this but this was quick low-stakes experiment)

Answer 2

I received the same vague message after making eslint alterations. Locally linting and deployment was successful, however deploying to vercel failed like yours.
Although "ignoreDuringBuilds": "true" in my .eslint.json did band-aid fix the issue, I was able to rollback each eslint change and found that my "linebreak-style": ["error", "windows"] was the underlying issue.
It passed linting locally, but failed on vercel deployment. I've fixed my line-breaks and all works great now without having to ignore during builds.