Usage: kotlinc-js <options> <source files>
where advanced options include:
  -Xno-inline                Disable method inlining
  -Xrepeat <count>           Repeat compilation (for performance analysis)
  -Xskip-metadata-version-check Load classes with bad metadata version anyway (incl. pre-release classes)
  -Xallow-kotlin-package     Allow compiling code in package 'kotlin'
  -Xplugin <path>            Load plugins from the given classpath
  -Xmulti-platform           Enable experimental language support for multi-platform projects
  -Xno-check-impl            Do not check presence of 'impl' modifier in multi-platform projects
  -Xskip-java-check          Do not warn when running the compiler under Java 6 or 7
  -Xcoroutines={enable|warn|error} Enable coroutines or report warnings or errors on declarations and use sites of 'suspend' modifier

Advanced options are non-standard and may be changed or removed without any notice.
OK