Proguard
This module allows Proguard to be used in Mill builds. ProGuard is a Java class file shrinker, optimizer, obfuscator, and preverifier.
By default, all four steps - shrink, optimize, obfuscate, verify - are run, but this can be configured through task options.
Any additional options can be specified as a list of strings with additionalOptions
. The full list of proguard options
can be found here.
The output of assembly
is used as the input jar and the output is written to out.jar
in the dest
folder.
The stdout
and stderr
from the proguard command can be found under the dest
folder.
The only default entrypoint is the main class (i.e. finalMainClass
task). Additional entrypoints can be configured using additionalOptions
as well.
Here is a simple example:
build.mill
package build
import $ivy.`com.lihaoyi::mill-contrib-proguard:`
import contrib.proguard._
object foo extends ScalaModule with Proguard {
def scalaVersion = "2.13.8"
override def shrink: T[Boolean] = T { true }
override def optimize: T[Boolean] = T { false }
override def obfuscate: T[Boolean] = T { false }
// https://github.com/Guardsquare/proguard/releases
override def proguardVersion = T("7.3.2")
// tell Proguard where to enter your app, so it can optimise outwards from there
override def entryPoint = T {
s"""|-keep public class myProject.main.myApp {
| public ReturnType main(ParamTypeA, ParamTypeB);
|}
|""".stripMargin
}
// customise to be as narrow/wide as your application requires
override def additionalOptions = Seq (
"-keep class myProject.main.myApp { *; }",
"-keep class Scala.Symbol { *; };
)
}