RemoveUnusedImports

This rule acts upon “Unused import” warnings emitted by the Scala compiler. See slick/slick/pulls#1736 for an example diff from running sbt "scalafix RemoveUnusedImports".

To use this rule:

• enable -Ywarn-unused-import

• disable -Xfatal-warnings. Unfortunately, the Scala compiler does not support finer grained control over the severity level per message kind. See scalameta/scalameta#924 for a possible workaround in the near future.

// before
import scala.List
import scala.collection.{immutable, mutable}
object Foo { immutable.Seq.empty[Int] }

// after
import scala.collection.immutable
object Foo { immutable.Seq.empty[Int] }

Note. This rule does a best-effort at preserving original formatting. In some cases, the rewritten code may be formatted weirdly

// before
import scala.concurrent.{
  CancellationException,
  TimeoutException
}
// after
import scala.concurrent.

  TimeoutException

It’s recommended to use a code formatter after running this rule.