stepdad

Stupid simple and lightweight dependency injection

Install

Install the package from npm:

npm i --save stepdad

Make sure that your tsconfig.json has the decorator options enabled:

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

Usage

Stepdad supports dependecy injections for constructors so far. You can create a class that will receive an injection by decorating it with @Inject() and bootstrap the class. Stepdad will then inject all needed dependencies that are specified in the constructor.

import { dad, Inject } from 'stepdad'

class BaseClass {
	print() {
		console.log('I love you, daddy!')
	}
}

@Inject()
class DependentClass {
	constructor(private base: BaseClass) {}

	print() {
		this.base.print()
	}
}

let [DC] = dad<DependentClass>(DependentClass)

DC.print()

The dependet class has to implement the Releasable interface if you need to release it at some point. The dad bootsrap function will then also export the release funtion.

import { dad, Inject, Releaseable } from 'stepdad'

class BaseClass {
	print() {
		console.log('I love you, daddy!')
	}
}

@Inject()
class DependentClass implements Releaseable {
	constructor(private base: BaseClass) {}

	print() {
		this.base.print()
	}

	release() {
		console.log('Bye')
	}
}

let [DC, release] = dad<DependentClass>(DependentClass)

DC.print()
release()