elm-watch doesn't exit when stdin closes

In my use case I spawn elm-watch hot from my backend app which uses Phoenix. I configure Phoenix using a watcher (https://hexdocs.pm/phoenix/Phoenix.Endpoint.html#module-runtime-configuration). I am also spawning esbuild for my other assets in the same way.

When Phoenix exits it signals to the child processes (esbuild and elm-watch in my case) that they should also exit by closing stdin, however, elm-watch doesn’t exit and is thus left running, so needs to be killed manually.

This is easy to reproduce by running npx elm-watch hot and then pressing ctrl-d - this closes stdin but has no effect on elm-watch which continues running.

I think this should be the standard behaviour for tools like this as both esbuild and webpack terminate from their “watch” mode when stdin is closed.

I can work around this by wrapping elm-watch in this script but it would be nice if this was handled directly by elm-watch.

I tried to fix this, but my JS/Node knowledge is quite basic and I wasn’t able to find the right place in the code to listen for stdin being closed and exit so unfortunately I cannot offer a PR.

[lydell]

Fixed the regression, released 1.1.0-beta.5 with this change. Hoping to release 1.1.0 the coming week.

[lydell]

A new version coming soon! At least a beta. I was going to release it as non-beta, but found a (minor) regression.