Extension of NgRx ActionsSubject to manage Component State

state-machine.ts

@Injectable()
export class ComponentStateMachine extends ActionsSubject {

    constructor() {
        super();
    }
    public next(action: any) {
        // add all your state machine magic here ....
        if (isValidAction) {
            super.next(action);
        }
    }
}

// then in the module providers section just add

{ provide: ActionsSubject, useClass: ComponentStateMachine }