Bug?: Confusing behaviour when combining `--optimize` with `--output=/dev/null`

[dave4420]

Setup:

src/Main.elm:

module Main exposing (main)

main : Program () () ()
main = Debug.todo "eventually"

I run elm make src/Main.elm --optimize --output=/dev/null.

Expected behaviour

The compiler gives me an error (including exiting with a non-zero status code), just as it would if I had specified --output=some.js.

Actual behaviour

The compiler prints Success! to stdout and exits with status 0.

Versions

• Elm: 0.19.1
• Operating System: macOS Sonoma 14.4.1

Additional Details

This appears to be caused by the compiler not generating code when given --output=/dev/null, and therefore not checking whether the Debug module is used.

An alternative would be to output a message in this case saying that --optimize --output=/dev/null does not check that --optimize --output=some-file.js would succeed, only that the source code typechecks.

[github-actions]

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