Kernel.ParallelCompiler.compile_to_path

You're seeing just the function compile_to_path, go back to Kernel.ParallelCompiler module for more information.
Link to this function

compile_to_path(files, path, options \\ [])

View Source (since 1.6.0)

Compiles the given files and writes resulting BEAM files into path.

See compile/2 for more information.