What is helper_functions in

• None
• Nonegood for?
  I do not find any example. The descriptions says

By default the pipeline step function has no access to any of the other functions, by specifying additional functions here, the remote pipeline step could call the additional functions.

Does this mean that within component or add_function_step I cannot use any code of my current directories code base, only code from external packages that are imported - unless I add my code with helper_functions ?