statewave/src/state.ts

Another Finite State Machine

import { Transition, Immediate, State } from ".";

// export type StateArgs<E, S> = ;

export function state<S, E>(
  ...args: (Transition<S, E> | Immediate<S> | undefined)[]
): State<S, E> {
  const transitions = args.filter((arg) =>
    arg && "__transition" in arg() ? true : false
  ) as Transition<S, E>[];
  const immediates = args.filter((arg) =>
    arg && "__immediate" in arg() ? true : false
  ) as Immediate<S>[];
  return () => ({
    __state: true,
    transitions,
    immediates,
  });
}