container-ioc

IoC Container written in Typescript

Annotation based Inversion of Controll container implementation with friendly API.

Installation:

npm install --save container-ioc

API usage:

Container's API and behaviour is very similar to the one used in Angular4.

in a Typescript project:

import { Container, Inject } from 'container-ioc';

let container = new Container();

class A {}
class B {}
class C {
    constructor(@Inject(B) public b: B) { // use @Inject() decorator to mark dependencies
    }
}

let providers = [
    A,
    { token: 'IB', useClass: B }, 
    { token: C, useClass: C },
    { token: 'UseValue', useValue: 'any-primitive-or-object'},
    {
        token: 'FromFactory',
        useFactory: () => {
            return 'something';
        }
    },
    {
        token: 'FromFactoryWithInjections',
        useFactory: (value, b, c) => {
            return `${value + b.constructor.name + c.constructor.name}`;
        },
        inject: ['UseValue', 'IB', C]
    }
];

container.register(providers);


// Resolve instances
let a: A = container.resolve(A);
let b: B = container.resolve('IB');
let c: C = container.resolve(C);
let value: string = container.resolve('UseValue');
let fromFactory: string = container.resolve('FromFactory');
let fromFactoryWithInjections: string = container.resolve('FromFactoryWithInjections');

Injection Token

Using string literals for tokens can become a head ache, use Injection Token instread:

import { InjectionToken, Container } from 'container-ioc';

let container = new Container();

interface IFactory {
    create(): any;
}

const TFactory = new InjectionToken<IFactory>('IFactory'); // T in TFactory stands for token

class ConcreteFactory implements IFactory {}

container.register({ token: TFactory, useClass: ConcreteFactory });

let factory: IFactory = container.resolve(TFactory);

Scoped containers

if a provider wasn't found in a container it will look up in ascendant containers if there's any:

import { Container } from 'container-ioc';

class A {}

let parentContainer = new Container();
let childContainer = parentContainer.createScope();

parentContainer.register({ token: 'IA', useClass: A });

let a = childContainer.resolve('IA');
a.doStuff(); // hello world

Contribution:

Feel free to submit a bug or a feature request. Or pick an issue from here and leave a comment with your proposal.

see CONTRIBUTION.md

Changelog

1.3.1 (2017-09-30)

Features

• Value and Factory: - container now can resolve values or anything returned from a factory. commit 50ebb63
• Injection Token - added InjectionToken class to facilitate working with abstractions. 3c380c878