ELM_DEBUGGER=true doesn't work when building apps, because it collides with --optimize

[runarfu]

Is this a bug report?

Yes

Environment

1. node -v: v10.9.0
2. npm -v: 6.2.0
3. yarn --version (if you use Yarn): 1.9.4
4. npm ls create-elm-app -g (if you haven’t ejected):
   ~/.nvm/versions/node/v10.9.0/lib
   └── create-elm-app@2.0.5

Then, specify:

1. Operating system: Ubuntu
2. Browser and version (if relevant): N/A

Steps to Reproduce

1. Successfully build an app with elm-app build.
2. Verify that the app is running without the time travel debugger.
3. Enable the debugger according to the docs: $ ELM_DEBUGGER=true elm-app build.

Expected Behavior

A successful build, with the debugger enabled.

Actual Behavior

It fails like this:

$ ELM_DEBUGGER=true elm-app build
Creating an optimized production build...
Failed to compile.

./src/Main.elm
-- CLASHING FLAGS --------------------------------------------------------------

I cannot compile with --optimize and --debug at the same time.

I need to take away information to optimize things, and I need to add
information to add the debugger. It is impossible to do both at once, so pick
just one of those flags.

Reproducible Demo

N/A

[halfzebra]

Hi @runarfu, thanks for reporting this!

Would you like to work on a PR?

[runarfu]

@halfzebra I've opened a PR which seems to solve this issue :)