ChromicPDF.Supervisor.with_services

You're seeing just the function with_services, go back to ChromicPDF.Supervisor module for more information.
Link to this function

with_services(chromic, fun)

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Specs

with_services(module(), (services() -> any())) :: any()

Fetches pids of the supervisor's services and passes them to the given callback function.

If the supervisor has not been started but configured to run in on_demand mode, this will start a temporary supervision tree.