What's considered a good way to share "global" variables inside a node module?

Question

How can I easily refer to other directories in my module without explicitly relative paths (../../../lib..)?

I'm writing a node module and there are some global things I want to reuse in my module.
Most basically - I want to set the root path of the module as a 'global' so I can easily call other sources without using a lot of relative paths ../../ and things like that. It can cause messy code and it's easy to mistake or miss it if the project structure changes.

So I've seen a lot of options in that post and some other libraries for dealing with those kind of things (such as modules that give the root path - app-module-path, rootpath, rfr etc.) but they all refer to a base project/application and not to a module that's being used by others.

Setting a global is a bad idea, and I understood that an environment variable is also not such a good idea.

Is there a good practice for that thing? Maybe there's something I haven't found or heard of.

Here's an example of what I'm trying to avoid and what I'm looking for:

// avoid things like that:

// ./lib/something/forthat/doit.js
var config = require('../../../config/project/type1/config.js');

// ./config/project/type1/config.js
module.exports = {
  msg: 'hi'
};


// find somethings like that:
// when the root path/require can be found in every location of the module
// and is relative to my app and not the app using my module.

// ./lib/something/forthat/doit.js
var config = require(rootPath + 'config/project/type1/config.js');
// OR
var config = rootRequire('config/project/type1/config.js');
// OR anything else

// ./config/project/type1/config.js
module.exports = {
  msg: 'hi'
};

Answer 1

For getting the current directory path you can use the global variable __dirname any where in your nodejs project. Example : console.log(__dirname) write this into any file in your project and console would print the current directory path as string. Or, You can use express-session module like;

var express = require('express');
var session = require('express-session');
var app = express();
app.use(session({myVar: 'abc'}));
app.get('/',function(req,res){
var sess = req.session;
console.log(sess);
});