Injects

Dependency injection for TypeScript : https://mickgrz.github.io/injects/

Use case :

Use a class instance without instantiate it.

The responsibility of providing dependency is delegated to an injector.

This separates the responsibilities of usages and construction.

This also improves readability, testability & maintainability.

$3

``js
class Dao {
public create(entity: any) {
[...]
}
}
`

`js
import {inject} from 'injects';
import Dao from './Dao';

class Service {

private dao: Dao;

constructor() {
this.dao = inject(Dao);
}

public create(entity: any) {
return this.dao.create(entity);
}
}
`

`js
const service: Service = new Service();
service.create({ entityId: 1 });// will call dao.create
`

You can also write :

`js
import {inject} from 'injects';
import Dao from './Dao';

class Service {

private dao: Dao = inject(Dao);

public create(entity: any) {
return this.dao.create(entity);
}
}
`

$3

Stubbing dependency is easy :

`js
import {Injectable} from 'injects';
import * as sinon from 'sinon';

Injectable('Dao', sinon.stub());
const service: Service = new Service();// will get stub dependency
service.create({ entityId: 1 });// will call the stub
`

Name of dependency's class is the key used to register the dependency instance.

Installation :

`
npm install --save injects
``