Trying to work with Node.js child_process

expensive_process.js

module.exports = function(input, args) {
  var expensiveResults = // Do some computationally expensive stuff with input and args...
  
  this.emit('results', expensiveResults);
}

myapp.js

// What I want is to be able to send data to a child process that contains a function that crunches the data and returns the results to the parent... I just don't quite get how to do that.


var child_process = require('child_process');

function run_in_child_process(input, args, options, _return) {
  new_child = child_process.fork('/expensive_process.js', args, options); // Somehow I need to get 'input' in there...?
  new_child.on('results', _return); // return is the passed in callback, setup like function(err,data) {}

  new_child.on('exit', function(code, signal) {
    console.dir(code);
    console.dir(signal);
  });
}