kotlin lang - Creating Kotlin/JavaScript library with IntelliJ IDEA

This tutorials walks us through creating a simple Kotlin/JavaScript library using IntelliJ IDEA. 

Setting up the environment

The tutorial works with IntelliJ IDEA Community Edition as well as IntelliJ IDEA Ultimate. For best experience developing Kotlin/JavaScript applications, we recommend using IntelliJ IDEA Ultimate, which includes the JavaScript debugger and other JavaScript support features.

1. Create a New Kotlin/JavaScript Project.
   
2. Specify the project name (e.g. sample-library), and click the Create for Kotlin JS library.
   
3. Select “Use library from plugin”. Of cource, you can choose copy library to some directory in your project, if you prefer.
   
4. Click the Finish.
   
5. We should now have the new project created and the following folder structure
   
6. Let’s create a new Kotlin file under the source folder. It can be named anything. In our case we will call itlibrary:

   package org.sample
      
   fun factorial(n: Int): Long = if (n == 0) 1 else n * factorial(n - 1)

7. Using File > Settings, check compiler settings for Kotlin compiler. Disable “Copy library runtime files”.
   
   Click the Build > Make Project, and check that out/production directory contains two new files.
   
8. Open Project Structure Dialog (File > Project Structure), select Artifacts and add new empty artifact.
   
   Choose name for artifact and add module compilation output to the content of newly created artifact.
   
9. Click the Build > Build Artifacts, and the resulting artifact is our library, which can be distributed.