Node.js Combine module/exports from multiple files

Question

I wish to split a large configuration .js file into multiple smaller files yet still combine them into the same module. Is this common practice and what is the best approach so that the module would not need extending when new files are added.

An example such as but not needing to update math.js when a new file is added.

math - add.js - subtract.js - math.js

// add.js
module.exports = function(v1, v2) {
    return v1 + v2;
}

// subtract.js
module.exports = function(v1, v2) {
    return v1 - v2;
}

// math.js
var add = require('./add');
exports.add = add;

var subtract = require('./subtract');
exports.subtract = subtract;

// app.js
var math = require('./math');
console.log('add = ' + math.add(5,5));
console.log('subtract =' + math.subtract(5,5));

Answer 1

You can use the spread operator ... or if that doesnt work Object.assign.

module.exports = {
   ...require('./some-library'),
};

Or:

Object.assign(module.exports, require('./some-library'));