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@tabdulradi
Last active November 24, 2022 07:39
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Scala Compiler flags for 2.13. Based on Tpolecat's 2.12 version
scalacOptions ++= Seq(
"-deprecation", // Emit warning and location for usages of deprecated APIs.
"-encoding", "utf-8", // Specify character encoding used by source files.
"-explaintypes", // Explain type errors in more detail.
"-feature", // Emit warning and location for usages of features that should be imported explicitly.
"-language:existentials", // Existential types (besides wildcard types) can be written and inferred
// "-language:experimental.macros", // Allow macro definition (besides implementation and application). Disabled, as this will significantly change in Scala 3
"-language:higherKinds", // Allow higher-kinded types
// "-language:implicitConversions", // Allow definition of implicit functions called views. Disabled, as it might be dropped in Scala 3. Instead use extension methods (implemented as implicit class Wrapper(val inner: Foo) extends AnyVal {}
"-unchecked", // Enable additional warnings where generated code depends on assumptions.
"-Xcheckinit", // Wrap field accessors to throw an exception on uninitialized access.
"-Xfatal-warnings", // Fail the compilation if there are any warnings.
"-Xlint:adapted-args", // Warn if an argument list is modified to match the receiver.
"-Xlint:constant", // Evaluation of a constant arithmetic expression results in an error.
"-Xlint:delayedinit-select", // Selecting member of DelayedInit.
"-Xlint:doc-detached", // A Scaladoc comment appears to be detached from its element.
"-Xlint:inaccessible", // Warn about inaccessible types in method signatures.
"-Xlint:infer-any", // Warn when a type argument is inferred to be `Any`.
"-Xlint:missing-interpolator", // A string literal appears to be missing an interpolator id.
"-Xlint:nullary-override", // Warn when non-nullary `def f()' overrides nullary `def f'.
"-Xlint:nullary-unit", // Warn when nullary methods return Unit.
"-Xlint:option-implicit", // Option.apply used implicit view.
"-Xlint:package-object-classes", // Class or object defined in package object.
"-Xlint:poly-implicit-overload", // Parameterized overloaded implicit methods are not visible as view bounds.
"-Xlint:private-shadow", // A private field (or class parameter) shadows a superclass field.
"-Xlint:stars-align", // Pattern sequence wildcard must align with sequence component.
"-Xlint:type-parameter-shadow", // A local type parameter shadows a type already in scope.
"-Xlint:unused", // TODO check if we still need -Wunused below
"-Xlint:nonlocal-return", // A return statement used an exception for flow control.
"-Xlint:implicit-not-found", // Check @implicitNotFound and @implicitAmbiguous messages.
"-Xlint:serial", // @SerialVersionUID on traits and non-serializable classes.
"-Xlint:valpattern", // Enable pattern checks in val definitions.
"-Xlint:eta-zero", // Warn on eta-expansion (rather than auto-application) of zero-ary method.
"-Xlint:eta-sam", // Warn on eta-expansion to meet a Java-defined functional interface that is not explicitly annotated with @FunctionalInterface.
"-Xlint:deprecation", // Enable linted deprecations.
"-Wdead-code", // Warn when dead code is identified.
"-Wextra-implicit", // Warn when more than one implicit parameter section is defined.
"-Wmacros:both", // Lints code before and after applying a macro
"-Wnumeric-widen", // Warn when numerics are widened.
"-Woctal-literal", // Warn on obsolete octal syntax.
"-Wself-implicit", // Warn when an implicit resolves to an enclosing self-definition.
"-Wunused:imports", // Warn if an import selector is not referenced.
"-Wunused:patvars", // Warn if a variable bound in a pattern is unused.
"-Wunused:privates", // Warn if a private member is unused.
"-Wunused:locals", // Warn if a local definition is unused.
"-Wunused:explicits", // Warn if an explicit parameter is unused.
"-Wunused:implicits", // Warn if an implicit parameter is unused.
"-Wunused:params", // Enable -Wunused:explicits,implicits.
"-Wunused:linted",
"-Wvalue-discard", // Warn when non-Unit expression results are unused.
"-Ybackend-parallelism", "8", // Enable paralellisation — change to desired number!
"-Ycache-plugin-class-loader:last-modified", // Enables caching of classloaders for compiler plugins
"-Ycache-macro-class-loader:last-modified", // and macro definitions. This can lead to performance improvements.
)
@AesaKamar
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Thanks for hosting, this, Tamer!

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