Is it possible to show Elm's Debugger while using elm reactor?
The debugger is no longer included by the elm reactor
in 0.19. It was apparently removed while refactoring (although it will probably be re-added in the future).
For now, I'd recommend using elm-live which also supports auto-reloading.
Yes, there is no elm reactor --debug
anymore. You will however still find a --debug
on the regular elm make
. So if your file was src/Main.elm
you would now do:
$ elm make src/Main.html --debug
Success!
Main ───> index.html
That index.html
is generated with the --debug
flag set. From elm make
's help, that means
--debug
Turn on the time-travelling debugger. It allows you to rewind and replay
events. The events can be imported/exported into a file, which makes for
very precise bug reports!
So would've been really nice to have it in elm reactor
but you still have an index.html
that you can "open" in a browser. I put open in double quotes because if you open it by clicking on it, you won't see what you're expecting to see. You'd want to properly open it by — "serving" it from the terminal and then opening it's link on the browser, like you did with elm reactor
. Most systems nowadays come with some version of python installed, so you can utilize a python command to do the "serving" of that index.html
file with the command
$ python3 -m http.server 8000
If you only have python 2.x, that command should be:
$ python –m SimpleHTTPServer 8000
Of course, feel free to serve it any other way you want to. You could use elm reactor
to serve that index.html
as well. In the main window that elm reactor
opens, locate the link to the generated index.html
and click on it, instead of src/Main.elm
. I'd advise against using this though, because it has the potential to be confusing. You might now be unsure whether you're looking at the main src/Main.elm
file or the generated index.html
.
As for elm-live
, yes it's a great option, you can supply the --debug
option as an elm make option.
$ elm-live src/Main.elm -- --debug
Pay heed to that --
before the --debug
option, as it marks the beginning of elm-live
's elm make options .
If nothing else, hope that clarifies where to find and use --debug
still. Cheers.
(Elm 0.19.1)