Compiles list of Strings with Scala JS code to a JavaScript.
This is an SBT project with Java 21, Scala 3.3.1 and Scala JS 1.12.0
Class ScalaStackJsCompiler uses method init to create Classpath with all necessary libraries loaded.
Use SBT to build a library. You can use > sbt publishM2 to create a local Maven library.
You need to copy the following libraries to the src/test/resources to run tests.
- scala3-library_3-3.3.1.jar
- scala-library-2.13.10.jar
- scalajs-javalib-1.12.0.jar
- scalajs-library_2.13-1.12.0.jar
This compiler is excellent to use for a backend server compiling JavaScript on request!
@WebListener
class WebServletContextListener extends ServletContextListener {
val scalaJsCode =
"""
|package tutorial.webapp
|
|object TutorialApp {
| def main(args: Array[String]): Unit = {
| println("Hello world!")
| }
|}
|""".stripMargin
def contextInitialized(contextEvent: ServletContextEvent): Unit = {
val loader: (String => InputStream) = (path) => contextEvent.getServletContext.getResourceAsStream(path)
val compiler = ScalaStackJsCompiler()
val classpath = compiler.init(loader, "/WEB-INF/lib/", Set("scala3-library_3-3.3.1.jar", "scala-library-2.13.10.jar", "scalajs-javalib-1.12.0.jar", "scalajs-library_2.13-1.12.0.jar"))
val javascript = compiler.compileScalaJsString(classpath, scalaJsFile, Optimizer.Fast)
}
}
This is reading JAR-files in WEB-INF/lib and provided ScalaJS source. One trick is to put all ScalaJS source in /src/main/webapp/ to make it available for the Servlet context.
Thanks to VirtusLab for upgrading this library!