scalafix-noinfer is a Scalafix rule to warn about undesired type inference. It offers a replacement for the NoInfer rule that was built into Scalafix 0.5.

See the blog post stricter Scala with -Xlint, -Xfatal-warnings, and Scalafix.

In a project with Scalafix enabled (0.9.0 or later):

ThisBuild / scalafixDependencies +=
  "com.eed3si9n.fix" %% "scalafix-noinfer" % "0.1.0-M1"

lazy val root = (project in file(".")).
  settings(
    name := "hello",
    addCompilerPlugin(scalafixSemanticdb),
    scalacOptions ++= List(
      "-P:semanticdb:synthetics:on",
      "-Yrangepos",
    ),
  )

rules = [
  NoInfer
]

Run scalafix or scalafix NoInfer with sbt.

By default this rule forbids the inference of scala.Any, scala.AnyVal, java.io.Serializable, scala.Serializable, and scala.Product. You can customize this using .scalafix.conf as follows:

rules = [
  NoInfer
]
NoInfer.disabledTypes = [
  scala.Any
  scala.AnyVal
  scala.Serializable
  java.io.Serializable
  scala.Product
  scala.Predef.any2stringadd
]

Apache-2.0