IntelliJ does not copy .kt files to the output and source maps will not load in chrome

Trying a simple hello world Kotlin javascript project, I notice that IntelliJ does not copy the .kt files to the output directory, and instead links the sourcemaps back to the original source files.  This means that I can't use the chrome dev tools to see breakpoints in my original .kt files.

With typescript, IntelliJ does copy the original sources and everything works.

Are there settings I can change?