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Last pushed: 7 months ago
Short Description
A CI compatible Elm container.
Full Description

Quick start

Add an elm alias (you probably want to add this to your .bashrc or similar):

alias elm='docker run -it --rm -v "$(pwd):/code" -w "/code" -e "HOME=/tmp" -u $UID:$GID -p 8000:8000 codesimple/elm:0.17'

Then use the alias to run the elm tools (version 0.17) from the container as you would normally:

elm make
elm package
elm reactor
elm repl

Further information

The elm tools in the image are built from source following the instructions at

The current directory is mounted into the container so that the elm tools can locate your project files
and write out elm.js and the elm-stuff directory.

Port 8000 is published to the host to allow this to be used when running elm reactor.
Change the -p setting if you want to map this to a different port or disable it.

HOME is set to /tmp in the container so that the .elm directory generated by the elm tools is placed there
and discarded. If you want to share .elm between runs you could set it to a directory that you have
mounted a volume or host directory at.

If you run elm reactor on an uncompiled project, you may get errors along the lines of:

elm-make: elm-stuff/packages/evancz/virtual-dom/2.1.0/src/VirtualDom.elm: hGetContents: invalid argument (invalid byte sequence)
elm-make: thread blocked indefinitely in an MVar operation

This can generally be avoided by running elm make on the project before you run elm reactor (or after to fix it).

Elm versions

To use a different version of the Elm tools just change the version number in the command above (after codesimple/elm:).
The following versions are currently supported:

  • 0.15.1
  • 0.16
  • 0.17


  • The elm repl for Elm 0.17 seems to be missing the coloured output that was present in Elm 0.16 (although error messages from elm make do appear in colour). I'm not sure if this is an issue with the build or with the Elm source.

Fork notes

This fork basically just replaces the ENTRYPOINT with CMD in order to use the image in a CI environment.

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