Getting the error `Error: spawn Unknown system error -8` when using Node 18
Opened this issue · 9 comments
It seems that with Node > 16 this error happens
Unexpected error:
Error: spawn Unknown system error -8
at ChildProcess.spawn (node:internal/child_process:413:11)
at spawn (node:child_process:757:9)
at /Users/.../node_modules/elm-watch/index.js:3087:19
at new Promise (<anonymous>)
at promise (/Users/.../node_modules/elm-watch/index.js:3082:36)
at spawn2 (/Users/.../node_modules/elm-watch/index.js:3158:99)
at install (/Users/.../node_modules/elm-watch/index.js:3703:29)
at continuation (/Users/.../node_modules/elm-watch/index.js:3818:33)
at installDependencies (/Users/.../node_modules/elm-watch/index.js:3876:14)
at /Users/.../node_modules/elm-watch/index.js:7333:35
Hi! I used elm-watch with Node.js 18 for a long time, and now I use Node.js 20 and it works fine. The tests also run Node.js 18.
Can you post more details?
I tried several Node versions and I got this weird pattern:
OK v16.14.2
Error v18.15.0
OK v18.16.0
Error v18.17.0
Error v18.17.1
Error v20.3.1
Error v20.7.0
On a MacBook Pro - Ventura 13.5.2
Huh, that’s strange.
Could you make a reproduction repo? Then I could clone it and play around as well, with the different Node.js versions you posted.
Do you mean a repo with Elm code? This is an example of a project that shows that error: https://github.com/lucamug/elm-web-components (you can run both elm-watch and a web server with cmd/start
).
But other repos have the same issue, for me. So I think is not related to the specific project. Also it is not excluded that is a specific problem of my configuration
A “reproduction repo” usually means a minimal repo that you make just to demonstrate an issue. It should contain step-by-step instructions on which terminal commands to run to reproduce.
Ok, I found the issue.
My projects install Elm inside node_folder but I assume elm-watch
use the global install.
For some reason, the global install did not work. Executing elm
just did not return anything.
Reinstalling Elm globally with npm -g install @lydell/elm
fixed the issue.
This was hard to find! I was able to notice something strange only after I tried to run "elm init" on some of the non-working Node versions.
I wonder if having elm-watch
to point to a different binary could be useful.
I expect devs that clone my projects to run "npm install" without requiring them to install Elm manually.
elm-watch tries to spawn just elm
:
Line 85 in 9d98d0e
So it’s up to you to make sure that elm
is in PATH. elm-test works that way too, and elm-review (unless I’m mistaken). The idea is that:
- If you install elm-watch globally, why wouldn’t you install elm globally as well?
- If you install elm-watch locally, you execute it with
npx
.npx
adds localnode_modules/
folders toPATH
, so both locally installed elm and globally installed elm are found.
Either way, elm-watch should never exit with “Unexpected error:” – it should print a helpful message. I tried to reproduce myself now. I made sure that elm-watch
in in PATH, but not elm
. This is what I get when running elm-watch hot
:
-- ELM NOT FOUND -------------------------
/Users/simon/stuff/elm.json
I tried to execute elm, but it does not appear to exist!
This is what the PATH environment variable looks like:
/Users/simon/.local/share/nvm/v20.5.0/bin
/Users/simon/.ghcup/bin
/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/usr/local/share/dotnet
Is Elm installed?
Note: If you have installed Elm locally (for example using npm or elm-tooling),
execute elm-watch using npx to make elm-watch automatically pick up that local
installation: npx elm-watch
I wonder what happens in your case? Does child_process.spawn() throw an error for some reason? I didn’t know it could. 🤔
It is a weird case where the elm
command works but nothing happens. This is what elm-review
returns:
-- UNEXPECTED ERROR ------------------------------------------------------------
I ran into an unexpected error. Please open an issue at the following link:
https://github.com/jfmengels/node-elm-review/issues/new
Please include this error message and as much detail as you can provide. If you
can, please provide a setup that makes it easy to reproduce the error. That will
make it much easier to fix the issue.
Below is the error that was encountered.
--------------------------------------------------------------------------------
undefined
and this is what elm-test
returns:
Compiling
Error attempting to run Elm compiler "/usr/local/bin/elm":
Error: spawn Unknown system error -8
Strange indeed!
- I wonder what “Unknown system error -8” means. Tried to Google it a little but nothing has come up so far.
- elm-test says
/usr/local/bin/elm
.- What happens if you execute that directly?
- What does
file /usr/local/bin/elm
say? - What does
shasum -a 256 /usr/local/bin/elm
say? - Where does that binary come from / how did you install it?