An example of DI with Node and Angular's "DI" system

context.js

var context = require('voltron-di');
context
  .indexModule("Controllers", "server/controllers", {
    dependencies: ["Core", "Services"],
    type: "factory"
  })
  .indexModule("DAOs", "server/daos", {
    dependencies: ["Core"],
    type: "service"
  })
  .indexModule("Models", "server/models", {
    dependencies: ["Core"],
    type: "service"
  })
  .indexModule("Services", "server/services", {
    dependencies: ["Core", "DAOs"],
    type: "factory"
  })
  .indexCore({
    additionalModules: {
      "env": require("../config")
    },
    aliases: {
      "st": "static",
      "body-parser": "bodyParser",
      "csurf": "csrf",
      "cookie-session": "session",
      "knex": "Knex"
    }
  })
  .module("App", ["Core", "Controllers"]);


context.module("Core")
  .factory("RouterFactory", function (express) {
    return function () { return express.Router(); };
  })
  .factory("knex", function (Knex, env) {
    return Knex.initialize(env.database);
  });


context.module("App")
  .factory("server", require("./index"));


module.exports = context;

voltron-di is on Github, but is not really documented at all or tested right now. It's a thin wrapper of NG's DI system, with some convenience functions thrown in.

indexModule will walk a subtree of files and wire them up to the appropriate ng-di module, camelCasing the names as needed. So server/controllers/admin/userController.js would be made accessible in the Controllers module as adminUserController.

indexCore creates a Core module with Node core's modules, and anything in your dependencies in your package.json. It can also alias module names.

Otherwise, things work the same as ng-di. The nice thing is that none of the required files have to reach out to the context to register themselves or to look anything up - although one could argue that tying constructor argument names to injectable signatures is itself a service lookup.

Note that I never inject lodash/underscore or Bluebird/Q, and just use CJS requires for those. They're never going to be tested since they're pure plumbing, and they'd need to be injected into EVERY file, so there's no point.