在node.js中没有特定对象的require（“ ssh2”）

Question

What does it mean if you require('ssh2') in Node.js without a specific object (eg require('ssh2').Client )? I have some code I am trying to understand and I am just learning Node.js. It's used like this:

var ssh2Connection = require("ssh2");
...
var conn new ssh2Connection();
conn.on("ready", function() {
...
});

Answer 1

Requiring require("ssh2") is essentially returning the value defined by this line

module.exports = 'hello'

Requiring require("ssh2").Client is essentially returning the value defined by this line

module.exports.Client = 'hello'

This is used to extend multiple objects to a module. Could be something like

module.exports.Client1 = 'hello1'
module.exports.Client2 = 'hello2'