intercepting module in node

intercept_module.js

const M = require('module')

const _load = M._load;
M._load = function(request, ...rest) {
  const _module = _load(request, ...rest)
  if (request === './module1.js') {
    return function(...args) {
      console.log(`intercepting ${request}`)
      _module(...args)
    }
  }
  return _module;
}

require('./module1.js')()
require('./module2.js')()

module1.js

module.exports = () => console.log('hello from module1')

module2.js

module.exports = () => console.log('hello from module2')