Question 1

How to set up elm-language-server in Vim with coc.nvim?

Accepted Answer

Install coc.nvim, add the Elm language server configuration to coc-settings.json, and ensure elm, elm-test, and elm-format are installed globally or locally. The README provides specific JSON snippets and mappings for features like definitions and hover.

Question 2

elm-language-server vs using elm-format and elm compiler separately?

Accepted Answer

elm-language-server integrates these tools for real-time feedback and diff-based formatting, reducing manual runs, whereas standalone use requires separate editor hooks or commands. It adds IDE features like completions and navigation that isolated tools lack.

Question 3

Why is elm-language-server not showing errors in my editor?

Accepted Answer

Common causes include missing elm.json, incorrect paths to Elm executables in server settings, or disabled diagnostics. Check the elmLS settings for elmPath and ensure elm and elm-test are installed, as per the requirements section.

Question 4

How to enable elm-review linting with elm-language-server?

Accepted Answer

Install elm-review globally or locally, then configure elmReviewPath and set elmReviewDiagnostics to 'warning' or 'error' in the server settings. The built-in linter can also be customized via documentation files.

Question 5

Does elm-language-server work with Elm 0.18 or older versions?

Accepted Answer

No, it only supports Elm 0.19 and up, as explicitly stated in the features section. For older Elm projects, alternative tools or manual setups are necessary, which may lack advanced IDE features.

Question 6

How to fix formatting issues with elm-language-server?

Accepted Answer

Ensure elm-format is correctly installed and the elmFormatPath setting is configured if needed. The server uses diff-based updates to minimize intrusiveness, but errors may arise from version mismatches or corrupted elm.json files.

Elm Language Server

What is Elm Language Server?

Overview

Use Cases

Best For

Found a gem we're missing?

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions