• elm-format
• prettier
• gofmt, the built-in Go formatting tool
• Some discussion of IntelliJ trailing whitespace issues
• elm-format editor integrations table
• elm-tooling
• elm-tooling Elm Radio episode
• Jeroen's elm-format tips tweet
• NoExposingEverything rule
• Discussion about single-line conditionals
• The original Elm style guide
• Join lines (J in vim, also available with intellij keybindings)