1-Domenic.js

"use strict";

// Domenic needs a Tweeter
function Domenic(tweeter) {
  this.tweeter = tweeter;
}
Domenic.inject = ["tweeter"];

Domenic.prototype.doSomethingCool = function () {
  return this.tweeter.tweet("Did something cool!");
};

module.exports = Domenic;

2-Merrick.js

"use strict";

// Merick also needs a tweeter
function Merrick(tweeter) {
  this.tweeter = tweeter;
}
Merrick.inject = ["tweeter"];

Meerick.prototype.doSomethingAwesome = function () {
  return this.tweeter.tweet("Did something awesome!");
};

module.exports = Merrick;

3-App.js

"use strict";

function App(domenic, merrick) {
  this.domenic = domenic;
  this.merrick = merrick;
}
App.inject = ["domenic", "merrick"];

App.prototype.run = function () {
  this.domenic.doSomethingCool().done();
  this.merrick.doSomethingAwesome().done();
};

module.exports = App;

4-bootstrap.js

"use strict";

var diContainer = require("di-container");

// Declaratively wire up dependencies. Note that while Domenic and Merrick both need the "tweeter"
// abstraction, we can choose *via configuration* to give them a difference "tweeter" concretion.
// They are completely decoupled from this knowledge.
diContainer.config({
  "app": require("./3-App"),
  "domenic": {
    constructor: require("./1-Domenic"),
    inject: {
      "tweeter": require("./LolSpeakTweeter-not-shown")
    }
  },
  "merrick": {
    constructor: require("./2-Merrick"),
    inject: {
      "tweeter": require("./LeetSpeekTweeter-not-shown")
    }
  }
});

// Construct the entire object graph, using above declarative config.
diContainer.get("app").run();

// Should Tweet:
// - "LOL I HAZ DID SOMETHING COOL LOL!"
// - "1 d1d s0m3th1ng 4w3s0m3!"