• Check if the module is actually a Schema, and that it has the given filed in the struct.
• Implement %{from: %{not: []}}.
• Implement %{from: :any}.
• Implement some custom compile time warnings/checks like ecto
• Ensure that event names are unique!
• Make to_state optional.
• Finalise the event function signatures:

  @spec event_name(BeepBop.Context.t(), keyword) :: BeepBop.Context.t()

• Compile time warnings about unused states.
• Move event function generation to __before_compile__
• Write tests to cover compile time errors/warnings with Code.eval_quoted
• Write tests to cover repo operations.
• Pick up code attributes written above event, like @doc.

The package can be installed in your project by adding beepbop to your list of dependencies in mix.exs:

def deps do
  [
    {:beepbop, github: "oyeb/beepbop"}
  ]
end