Refactoring everything without breaking some is hard.
@include is a lightweight, small, and convenient module designed solely to make importing local libraries easy and most importantly, flexible in case it's ever needed.
Imagine having the following lib directory at version 0.2:

lib/
├── common
│   ├── ask-q.js
│   ├── print.js
│   └── shutdown.js
├── hierarchy
│   └── carveFromJSON.js
├── manager
│   ├── index.js
│   ├── map-interpreter.js
│   └── sanity-check.js
├── print.js
└── templates
    └── Q
        ├── database.json
        └── yesOrNo.js

5 directories, 10 files

And, for reasons, you had to change the entire lib's structure for version 0.9.0-alpha.
You've come a long way since version 0.2. Your codebase has grown much bigger and you're using plenty more libraries than you did before.
So how do you adjust every require("path_to_lib") with the new folder structure?

• Use the refactoring tools built into your Editor / IDE?
• Find and Replace every instance? (hopefully not)

In my humble opinion, these are messy and not really professional.
That's the reason why @include was born

~project] $ npm install --save include-nodejs

or, you know:

~project] $ npm i include-nodejs

Having your library folder, run:

~project] $ npx include map 

> .includemap does not exist.
Should we create it for you? [Y|n]: Y
Library root? [$PWD/lib]: // defaults to ./lib

or, you know:

{
  // example '.includemap' at the root of your project  
  
  "_LIBROOT": "/unix/style/abspath/to/project/lib",
  "_MAP": {
    // sample mapping:
    "common":     "$_LIBROOT/common",
    "templates":  "$_LIBROOT/templates",
    
    "get-os": "$common/get-os.js",
  }
}

~project] $ npx include check

or, you know:

// Include the script in your 'package.json'
{
  "scripts": {
    "include": "include"
  }
}

And then run:

~project] $ npm run include check

Either way, green is good.

// file: project/src/index.js
const include = require("include-nodejs");

const getOS = include("$get-os");

function isRunningDos() {
  if ( getOS() === "windows" )
    return true;
}

......

// file: project/src/cli/schema
const include = require("include-nodejs");

const QnA = include("$templates/q-n-a.js");
// ...

Simple. It reads a JSON-formatted file named .includemap from the working directory of the current node process (which is likely the root of the project unless intentionally changed).
Using our example lib, this would be a valid .includemap:

{
  "_LIBROOT": "/home/watermelon/Work/Github/watermelon-reborn/lib",

  "_MAP": {
    "print": "$_LIBROOT/print.js",

    "common":     "$_LIBROOT/common",
    "hierarchy":  "$_LIBROOT/hierarchy",
    "manager":    "$_LIBROOT/manager",
    "templates":  "$_LIBROOT/templates",
    "QTemplates": "$templates/Q",
    "QDatabase":  "$QTemplates/database.json",

    "ask-q":    "$common/ask-q.js",
    "print":    "$common/print.js",
    "shutdown": "$common/shutdown.js",

    "carveFromJSON": "$hierarchy/carveFromJSON.js",

    "map-interpreter": "$manager/map-interpreter",
    "sanity-check":    "$manager/sanity-check"
  }
}

I am well aware of the limits which I'm putting on the project because of its design. I have plans to remove them, and make @include much more flexible when I have the time (checkout my Wishlist below).

• _MAP is where you map keywords to paths.
• Each entry can reference another by using a $ sign.
• _LIBROOT is required. It's the absolute path to your library root.

The first (and only) argument is the string to be translated:

const print = include("$print");
// or
const print = include("$common/print.js");

const print = include("print") // raises MODULE_NOT_FOUND

• The $ prefix indicates a keyword.
• The translator treats each keyword as something to be read from .includemap.
• The translator loop-translates the string looking for keywords until there are none left.

• Add a CLI interface.
• Add a CLI library mapper for convenience.
• Support Windows (Oh c'mon! Do I have to?)
• Support multiple include maps for different work environments.
• Support multiple library roots.
• Support loading libraries from another server.