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()