dk-test-npm-module/index.js

A test module to understand how npm modules are created

exports.printMsg = function() {
  console.log("This is a message from the demo package");
};

exports.calcArea = function(width, height) {
  if (isNaN(width) || isNaN(height)) {
    console.log("Width and height must be numbers");
    return null;
  }

  return width * height;
};