otherwise your breakpoints will not be recognised and processed correctly.
CoffeeScript Source Map.
For more details about transpilation in PhpStorm, see the section Using File Watchers.
Debugging CoffeeScript is supported only in the local mode.
This means that PhpStorm itself starts the Node.js engine and the target application
according to a run configuration and gets full control over the session.
For more details about debugging Node.js applications, see Running and Debugging Node.js.