Typescript support

[mattbradbury]

Would be awesome to have Typescript definitions.

[krasimir]

Yeah ... that will be really nice. Unfortunately I have 0 experience with TypeScript. PRs are of course welcome.

[mateusvahl]

I've possible to add your own types, here an example:

// Transitions:
export enum SCREENS {
  IDLE = "screen_idle",
  LOGIN_DETAILS = "screen_login_details",
}

// Machine State
type MachineState = {
  name: SCREENS;
  step: number;
};

// Machine interface
export interface MachineProps {
  name: string;
  state: MachineState;
  isScreenLoginDetails: () => boolean;
  isScreenIdle: () => boolean;
  advance: () => null;
}

// Your methods
export const advance = (machine: MachineProps): MachineState => {
 // Return the new state...
  return state;
};

// Constructor
export const makeMachine = (): MachineProps => {
  const initialState: MachineState = {
    name: SCREENS.IDLE,
    step: 1
  };

  return Machine.create("my-machine-name", {
    state: initialState,
    transitions: {
      [SCREENS.IDLE]: {
        advance,
      },
      [SCREENS.LOGIN_DETAILS]: {
       // ...
      },
    },
  });
};