I'm totally new to Kotlin - I just installed IDEA and created a new Kotlin JS project. Unfortunately, I can't build due to this bug: https://youtrack.jetbrains.com/issue/KT-20650#tab=History How do I use the beta plugin that this is fixed in?

Please take a look to “How to try it” section of Beta2 blogpost: https://blog.jetbrains.com/kotlin/2017/10/kotlin-1-2-beta2-is-out/