Inject It

This is yet another simple dependency injection tool that will help you resolve dependencies to focus on bisness logic instead of how and when provide dependencies.

Main features:

• property based injection
• support for multiple DI containers
• constructor based injection

Changelog

1.1.0

• Add constructor based injections
• Add auto resolve constructor dependencies (no need to use @Inject on Injectables dependencies)
• Fix issue with resolving non-injectable dependencies

Disclaimer

This project was built to understand how decorators and Reflect working in TypeScript and how Dependecy Injection can be impletented.

Installation

To start using package you need to run following commands via NPM:

  npm install @mificot/inject-it reflect-metadata

Import reflect-metadata package in the your entry source file

import 'reflect-metadata'

// your source code

Also you need to enable emitting decorator metadata in tsconfig.json file under compilerOptions key:

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true
  }
}

That it. Now you ready to go 😊

Usage/Examples

Basic example

import { Container, Inject, Injectable } from '@mificot/inject-it'

const container = new Container()

@Injectable()
class InjectableClass {
  public action(): void {
    console.log('hello there')
  }
}

@Injectable()
class BaseClass {
  @Inject()
  public readonly injectableClass: InjectableClass
}

container.resolve(BaseClass).injectableClass.action() // logs: "hello there"

Todo

• [x] Constructor based injection
• [ ] Global container
• [ ] More docs