Angular2 DI in Typescript. Can we use it in node.js / non-angular projects?

Question

Was the angular2 dependency injection container designed for standalone use, and is it possible to use it for typescript/javascript server-side applications ?

I opened an issue on Oct. 16 (https://github.com/angular/di.js/issues/108) on the di project which was I guess supposed to make it into v2. Apparently this was not possible. What's up with the new angular2 di ? Can I use it in a standalone fashion with js / es6 / ts projects?

Answer 1

Seems someone has extracted dependency injection from Angular2 recently(Jan 2017), which allow it to use outside of the framework.

https://github.com/mgechev/injection-js

Answer 2

As of Angular 2 RC.5, DI is a part of @angular/core package. For non-Angular uses, it was recently extracted into injection-js package by Minko Gechev, a member of Angular team.

Here is a short ES6, Node-friendly example:

// may not be needed for injection-js and recent @angular/core versions // if ES5-flavoured `Class` helper isn't used require('reflect-metadata');  const { Inject, Injector, ReflectiveInjector, OpaqueToken } = require('@angular/core'); // or ... = require('injection-js');  const bread = new OpaqueToken; const cutlet = new OpaqueToken;  class Sandwich {     constructor(bread, cutlet, injector) {         const anotherBread = injector.get('bread');          injector === rootInjector;         bread === 'bread';         anotherBread === 'bread';         cutlet === 'cutlet';     } }  Sandwich.parameters = [     new Inject(bread),     new Inject(cutlet),     new Inject(Injector) ];  const rootInjector = ReflectiveInjector.resolveAndCreate([     { provide: 'bread', useValue: 'bread' },     { provide: bread, useValue: 'bread' },     { provide: cutlet, useValue: 'cutlet' },     Sandwich ]);  const sandwich = rootInjector.get(Sandwich);