Elm Plugin for Visual Studio Code (VSCode)

Supports elm 0.19 and up

Install

1. Install VSCode from here
2. Follow this link to install the plugin
3. Make sure you have nodejs and therefore npm installed
4. Make sure you have Elm installed
5. Install elm-test and elm-format by running

   npm install -g elm-test elm-format

   in a terminal

Highlighted Features

• Errors and informations when changing code and when saving (Control + S)
• Format on save (Control + S)
• Suggests completions and snippets (Control + Space)

Additional Features

• Lists all references to a type alias, module, custom type or function (Alt + Shift + F12)
• Jump to the definition of a type alias, module, custom type or function
• Shows type annotations and documentation on hover for type alia, module, custom type or function
• Rename a type alias, module, custom type or function (F2)
• Browse file by symbols (Control + Shift + O)
• Browse workspace by symbols (Control + Shift + R)
• Codelenses show how many times you calling a function and if it's exposed or not
• Code folding
• Type inference
• Some more

Extension Settings

This extension contributes the following settings:

• elmLS.trace.server

  : Enable/disable trace logging of client and server communication

• elmLS.elmPath

  : The path to your elm executable.

• elmLS.elmFormatPath

  : The path to your elm-format executable.

• elmLS.elmTestPath

  : The path to your elm-test executable.

• elmLS.disableElmLSDiagnostics

  : Disable linting diagnostics from the language server.

• elmLS.skipInstallPackageConfirmation

  : Skip confirmation for the Install Package code action.

Configuration

Create an elm-tooling.json file next to your

elm.json

Currently there’s just one thing that you can configure: entrypoints. We run

elm make

elm make

main =

elm make

Example:

{
  "entrypoints": ["./src/Main.elm"]
}

The entrypoints are relative to the directory where your

elm.json

elm-tooling.json

./

Check out the elm-tooling CLI for creating and validating your

elm-tooling.json

FAQ

• How to get a logfile?

  • F1

    -> Type

    Output: Focus on Output View

    -> In the now open panel, use the drop down on the right to choose

    Elm (your project name)

• Most features don't seem to work for me?

  • This tool needs a valid elm project, please check if you have an

    elm.json

    . You can easily initialize your project with

    elm init

    . If it still does work, please try if you get the same behavior with the elm-spa-example.

• What's the relation to the language server?

  • This vscode extension is including the elm-language-server which enables most of the used features.

• Why do I need to install

  elm

  ,

  elm-test

  and

  elm-format

  ?
  • You will need to install

    elm

    and

    elm-test

    to get all diagnostics and

    elm-format

    for formatting. If your setup fails to find the global installations of those, you can use the settings panel in VSCode to set the paths to the executable manually. Alternatively you can also just install these to your local npm

    package.json

    .

• I don't like the inserted lines for "X references" (CodeLenses)

  • You can configure VSCode to not show them, just look for "Editor: Code Lens" in your settings.

• I'm using glsl and the extension is not helpful

  • You need to additionally install vscode-glsllint

Contributing / Debugging

git clone --recursive [email protected]:elm-tooling/elm-language-client-vscode.git
cd elm-language-client-vscode
npm install

Open VSCode with this project (

code .

F5