@aappddeevv/scalajs-loader

Scala.js Webpack loader

This is an updated version from https://github.com/mrdziuban/scalajs-loader.

Usage

This is a simple Webpack loader that shells out to SBT to build a Scala.js project.

To use it, first install the package:

$ npm install --save scalajs-loader

then configure the loader in your Webpack config:

module.exports = {
  // ...
  module: {
    rules: [
      { test: /\.scala$/, loader: 'scalajs-loader' },
      // ...
    ]
  }
}

Make sure you have the sbt binary somewhere in your PATH.

Example

Check out the example directory for a simple Hello World example.

Options

Options can be provided to specify the scalajs stage, fullOptJS or fastOptJS.

... as above ...
{ 
  test: /\.scala$/,
  loader: 'scaljs-loader',
  options: { 
    jsStage: 'fullOptJS',
    clean: true
  }
}

An additional option dirSegment appends a directory segment after the standard scalajs target output directory (such as target/scala-2.12) in case you are using a sbt plugin like scalajs-bundler that alters the output directory.

To reduce build times, you may want to keep clean: false for dev work and run clean only for the production build.

All options:

• verbose: Print messages during processing.
• clean: Clean prior to build.
• dirSegment: Directory segment inserted into the constructed path to find the .js file.
• removeSoruceMapUrl: Remove the source map URL.
• jsStage: "fastOptJS" or or "opt"