This is a barebone example of an application written in Scala.js.

To get started, open sbt in this example project, and issue the task packageJS. This creates the file target/scala-2.10/example.js and its siblings example-extdeps.js and example-intdeps.js. You can now open index-dev.html in your favorite Web browser!

During development, it is useful to use ~packageJS in sbt, so that each time you save a source file, a compilation of the project is triggered. Hence only a refresh of your Web page is needed to see the effects of your changes.

Instead of running packageJS, you can also run preoptimizeJS to generate a much more compact version of the JavaScript code in virtually no more time than you run packageJS. In that case, open the example-preopt.html file to execute the application. Note that browser refresh is much faster in this case.

preoptimizeJS should be fast enough for you to use ~preoptimizeJS in sbt for your development cycle.

For ultimate code size reduction, use optimizeJS. This will take several seconds to execute, so typically you only use this for the final, production version of your application. While index-dev.html (resp. index-preopt.html) refers to the JavaScript emitted by packageJS (resp. preoptimizeJS), index.html refers to the optimized JavaScript emitted by optimizeJS.