action.js

import fileSaver from 'utils/fileSaver';
import { downloadFileRequest } from './api';
import * as types from './actionTypes';

export const downloadFile = id => async dispatch => {
  try {
    dispatch({
      type: types.DOWNLOAD_FILE_REQUEST,
    });

    const { data } = await downloadFileRequest(id);
    
    await fileSaver(data, 'fileName.txt');

    dispatch({
      type: types.DOWNLOAD_FILE_SUCCESS,
    });

    alert('File downloaded successfully!');
  } catch (error) {
    dispatch({
      type: types.DOWNLOAD_FILE_ERROR,
    });
    
    if (error.response) {
      alert(error.response.data.message);
    } else {
      alert('Something went wrong while downloading this file');
    }
  }
};