Creates event-listener-style communication between parent and child.

child-process-event-helper.js

function onChild(child, event, callback) {
    child.on('message', (function (args) {
        if (args[0] === event) {
            callback.apply(null, Array.prototype.slice.call(args, 1));
        }
    }));
}

function emitChild(/* child, event, [arg1], [arg2], [...] */) {
    var args = Array.prototype.slice.call(arguments);
    var child = args.shift();
    child.send.call(child, args);
}

function onParent(event, callback) {
    process.on('message', function (args) {
        if (args[0] === event) {
            callback.apply(null, Array.prototype.slice.call(args, 1));
        }
    });
}

function emitParent(/* event, [arg1], [arg2], [...] */) {
    process.send.call(process, Array.prototype.slice.call(arguments));
}

// EXAMPLE

// Server

var child = require('child_process').fork(__dirname + '/static.js');

onChild(child, 'request', function (server) {
  // ...
});
emitChild(child, 'listen', port);

// Child

onParent('listen', function (port) {
  // ...
})

emitParent('request', request);