[FR] demonstrate Next.js example with output: "standalone" about examples HOT 4 OPEN

I've been working on this in a branch:
https://github.com/bazelbuild/examples/compare/nextjs_standalone

Some observations:

• next.js wants to copy node_modules from the working directory into the .next/standalone output directory.
• rules_js patches the Node.js runtime to make symlinks exiting the sandbox appear as regular files. patch_node_fs = False would stop that happening, but causes a different error, it appears in that branch
• We ought to be able to remove the dangling symlinks after next.js finishes running webpack. In that branch I have a workaround.js which tries to do that by hooking process.on('exit', ...) - however it's getting run many times, and seems to run too early, as webpack then errors that it can't find node_modules entries
• it seems like --sandbox_debug (and possibly --noincompatible_sandbox_hermetic_tmp) cause the output to be better-formed such that I was able to get the build action to succeed, and even run node server.js in the resulting output tree
• running outside of the sandbox might help.

from examples.

Sorry I ran out of time to work on this, I had a short-term funding source for 30min of hand-on-help but we only scheduled two of those.

from examples.

@gregmagolan has a solution for this now.

from examples.

We were able to get next start to work without needed standalone mode.

Would be good to get a proper example landed here in the future but for now here is a link to a delta with some comments on the changes: https://github.com/be9/bazelbuild-examples/pull/2/files

Since the example is bzlmod only we should probably fix the bzlmod toolchain issue first: aspect-build/rules_js#1530

from examples.