Package description
The 'di' npm package is a lightweight dependency injection (DI) library for JavaScript and Node.js. It allows developers to manage dependencies in a modular and scalable way, which is particularly useful in large applications or when implementing inversion of control (IoC) patterns.
Dependency Registration
This feature allows you to register dependencies with the injector. In the code sample, an API key is registered as a value dependency.
const Injector = require('di');
const injector = new Injector();
injector.value('apiKey', '12345');Dependency Resolution
This feature involves resolving and injecting dependencies into services or other components. The code sample demonstrates how to resolve a 'MyService' instance with 'apiKey' injected into it.
const Injector = require('di');
const injector = new Injector();
function MyService(apiKey) { this.apiKey = apiKey; }
injector.value('apiKey', '12345');
injector.service('myService', MyService, ['apiKey']);
const myServiceInstance = injector.get('myService');Child Injectors
Child injectors inherit dependencies from their parent injector but can also override them. This feature is useful for creating isolated scopes.
const Injector = require('di');
const parentInjector = new Injector();
const childInjector = parentInjector.createChild();
parentInjector.value('apiKey', '12345');
childInjector.get('apiKey');Inversify is a powerful and flexible inversion of control library for JavaScript & Node.js apps powered by TypeScript. It offers more advanced features like decorators and metadata reflection, which makes it more suitable for complex projects compared to the simpler 'di' package.
BottleJS is a minimalistic dependency injection micro container for JavaScript. It provides similar functionalities to 'di' but also includes middleware support and is slightly more feature-rich while still being lightweight.
Awilix is a dependency injection container for Node.js with support for ES6 Classes and a focus on modularity and testability. It differs from 'di' by offering more comprehensive configuration options and automatic resolution of dependencies.
Readme
This readme describes how to set up your working space in order to run the tests and hack on it. See How can I use it on how to use this DI framework in your project.
# Clone this repo (or your fork).
git clone https://github.com/angular/di.js.git
# Install all the the dev dependencies, such as Karma, Gulp, etc.
npm install
# If you wanna use "karma" or "gulp" commands, install also:
npm install -g karma-cli
npm install -g gulp
This will start Karma and Chrome (with --harmony enabled). Karma will watch the source code and run the tests anytime you save a change.
karma start
All the source code is written in the upcoming version of JavaScript - ES6. In order to use it in the current browsers you need to transpile the code into ES5 using Traceur.
# Transpile ES6 into ./compiled/*
gulp build
# Watch all the sources and transpile on any change
gulp watch
gulp build_examples
gulp serve
I talked about this DI framework at the ng-conf, here are some more links...
Also, here is the original design doc, which is quickly becoming out-dated ;-)
FAQs
Dependency Injection for Node.js. Heavily inspired by AngularJS.
We found that di demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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