thenMiddleware

thenMiddleware.js

function thenMiddleware() {
  return next => action => {
    const { then, type, ...rest } = action;
    if (!then) {
      return next(action);
    }

    next({ ...rest, type });

    if (typeof then === 'string') {
      return next({ ...rest, type: then });
    } else {
      then.forEach(type => {
        next({ ...rest, type });
      });
    }
  }
}