Autonode

Disclaimer

This library is no longer being maintained. It is based upon the library continuation-local-storage, which does not work with promises. So I can't recommend using this anymore :(

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Dependency injection for NodeJS inspired by Autofac (C# DI library)

Getting Started

Installation

npm install auto-node

Setup

let autonode = require('auto-node');

let app = express();
app.use(autonode.Middleware);

app.use((req, res, next) => {
  let containerBuilder = new autonode.ContainerBuilder();
  containerBuilder.registerType('UserRepository', UserRepository, autonode.LifetimeScope.InstancePerRequest);
  autonode.Container.load(containerBuilder);
}

Basic Usage

let container = require('auto-node').Container;

class UserRepository {
  constructor() {
    this.logger = container.resolve('logger');
  }
}

API

Registration

containerBuilder.register(key, instanceFunction, lifetimeScope);
containerBuilder.registerType(key, classType, lifetimeScope);

Lifetime Scopes

autonode.LifetimeScope.InstancePerRequest
autonode.LifetimeScope.SingleInstance
autonode.LifetimeScope.None

Examples

Instance referencing another registration

containerBuilder.register('lineItemRepository', () => new LineItemRepository(), autonode.LifetimeScope.InstancePerRequest);
containerBuilder.register('tripRepository', (c) => new TripRepository(c.resolve('lineItemRepository'), autonode.LifetimeScope.InstancePerRequest);

Automatic constructor injection

containerBuilder.registerType('lineItemRepository', LineItemRepository, autonode.LifetimeScope.InstancePerRequest);
conatienrBuilder.registerType('tripRepository', TripRepository, autonode.LifetimeScope.InstancePerRequest);

class TripRepository {
  constructor(lineItemRepository) { // parameter name must match registration key
    this.lineItemRepository = lineItemRepository;
  }
}

class LineItemRepository {
  constructor() { }
}

Access request from anywhere without passing it to every function

containerBuilder.register('request', () => req);
containerBuilder.register('requestAwareTripRepository', (c) => new TripRepository(c.resolve('request')));