如何在 NodeJS 中转换为导入/导出 ES 模块

Question

Could someone please explain how to convert to imports in NodeJS using following example?

const session = require('express-session');
const MongoDBStore = require('connect-mongodb-session')(session);

Answer 1

You can do it by the following method.

 import MongoDBStore from 'connect-mongodb-session';
 import session from 'express-session';

 const MongoStore = MongoDBStore(session);

Answer 2

If you look at the underlying code of connect-mongodb-session which you can find here Github-connect-mogodb-session you will see that this exports something like: module.exports = function(connect) {

Which basically says, that it exports (makes available for require import) a function with a parameter named connect. In their docs (just above this exports) they say:

/**
 * Returns a constructor with the specified connect middleware's Store
 * class as its prototype
 *
 * ####Example:
 *
 *     connectMongoDBSession(require('express-session'));
 *
 * @param {Function} connect connect-compatible session middleware (e.g. Express 3, express-session)
 * @api public
 */

Showing to the caller what is expected as parameter to this module. Some more useful examples here: tutorialsteacher