Winter

Winter can do dependency injection without being intrusive on your existing code.

// hello.js

module.exports = function(){
    this.message = "Hello";
};

// main.js

module.exports = function(logger, hello){
    logger.info(hello.message);
};

// index.js

var Winter = require('winter');
var winter = new Winter();

winter.register('logger', new Winter.LoggerProvider());

winter.registerModules(require, {
    'main': './main',
    'hello': './hello'
});

winter.link().done();

This will output

[2014-04-06 16:06:09.104] [INFO] main - Hello

For static values like the above "Hello" string, it is better to use Winter.ValueProvider.

Additionally

• You can create custom providers like LoggerProvider, check out the sources; it's easy.
• Winter works with q promises; providers can freely return promises instead of instances directly.
• Registering a provider more than once on the same name will overwrite the previous provider for that name.
• Winter's link should only be called once, and all providers should be registered before calling link.
• Cyclic and missing dependencies cause link's promise to fail, with information on whats wrong or missing.