typesafe-actions type guard.ts

import { ActionCreatorBuilder, getType } from 'typesafe-actions';

interface IAppAction {
  type: string;
  payload: any;
  [extra: string]: any;
}

export function isType<TPayload = any>(
    action: IAppAction,
    actionCreator: ActionCreatorBuilder<string, TPayload, any>,
): action is ReturnType<typeof actionCreator> {
    return (action as ReturnType<typeof actionCreator>).type === getType(actionCreator);
}