Addresses #57066
Currently, a user running `next start` on an un-built Next.js project
receives a confusing uncaught error before the process just ends:
```
▲ Next.js 14.1.0
- Local: http://localhost:3000
[Error: ENOENT: no such file or directory, open '/home/flotwig/src/project/.next/BUILD_ID'] {
errno: -2,
code: 'ENOENT',
syscall: 'open',
path: '/home/flotwig/src/project/.next/BUILD_ID'
}
```
In my case, I ran into this because I had not worked with Next.js for a
while, and I forgot that `next dev` was used for local development, not
`next start`. I believe many of the confused users in #57066 are making
a similar mistake and not realizing it, due to the error message.
This PR catches an `ENOENT` when reading `BUILD_ID` and suggests that
the user `next build` or `next dev` to remove this friction point:
```
▲ Next.js 14.1.1-canary.69
- Local: http://localhost:3000
Error: Could not find a production build in the '.next' directory. Try building your app with 'next build' before starting the production server. https://nextjs.org/docs/messages/production-start-no-build-id
at setupFsCheck (/home/flotwig/src/next.js/packages/next/src/server/lib/router-utils/filesystem.ts:157:13)
at initialize (/home/flotwig/src/next.js/packages/next/src/server/lib/router-server.ts:90:21)
at Server.<anonymous> (/home/flotwig/src/next.js/packages/next/src/server/lib/start-server.ts:295:28)
```
A few things probably need to be resolved before this PR can merge, I
would appreciate any input from Next.js maintainers.
- [x] Is this the best place to catch this? I am not familiar with the
Next.js codebase, so I just caught this in the most obvious way.
- [x] Can the error message be improved?
- [x] Add a test for the error in `test/development`
---------
Co-authored-by: JJ Kasper <jj@jjsweb.site>
