How to force Intellij IDEA to use colon instead of braces for Scala 3 (Dotty)?

Question

I want my classes look like:

class Dog:
  def bark(): String = ...

instead of:

class Dog {
  def bark(): String = ...
}

when I'm creating (generating) Scala file.

Is there any way to achieve this via settings or plugin?

Answer 1

The easiest way for me would be to:

• create .scalafmt.conf in project root
• put there (among others) runner.dialect = scala3 and rewrite.scala3.removeOptionalBraces = yes (possibly with rewrite.scala3.convertToNewSyntax = true)
• maybe also add format on save, though personally I prefer to add scalafmt to sbt and format on compilation

This way, yes, IntelliJ would create whatever it has in its templates, but right after that I would convert it to whatever my whole project uses.