ESLint equivalents in Elm

In the JavaScript community, ESLint is a widely adopted linter for JavaScript that is a huge help in making JS code more maintainable.

In the Elm community, the closest equivalent is elm-review, but that one has a lot less rules than ESLint (and not because I’m not writing them). That is somewhat understandable because we already have a compiler checking for some of those issues, and we have elm-format to handle styling-related issues.

Mario Rogic and I thought it would be really interesting to see how many of the ESLint rules applied in the Elm ecosystem. So I went through every single one of the 263 “core” ESLint rules (not from packages, there are so many that it’s not even funny to consider doing) and noted that down.

The results can be found on the Elmcraft website. Note that some of the things are interactive 🙂

It was a bit hard to categorize everything (some things can fit into multiple categories), but I tried my best to be objective.

Huge thanks to Mario for editing the article and talking me into researching this.

Written by Jeroen Engels, author of elm-review. If you like what you read or what I made, you can follow me on BlueSky/Mastodon or sponsor me so that I can one day do more of this full-time ❤️.