block17.ts

function _makeActionInternal<Z extends {}>(type: string, typePrefix = '') {
  return <X extends (...args: any[]) => Z>(fn: X) => {
    const returnFn: IActionType<X> = (
      (...args: any[]) => ({ ...(fn as any)(...args), type })
    ) as any;
    returnFn.__actionType = typePrefix + type;
    return returnFn;
  };
}

// Create normal actions
export function makeAction<Z>(type: string) {
  return _makeActionInternal<{ payload: Z }>(type);
}

// Create pack actions 
export function makePackAction<T>(type: string) {
  return _makeActionInternal<{
    meta?: { [key: string]: any };
    promise: Promise<T>;
  }>(type, 'PACK_');
}