Pesudocode Concept: Dependency Injection with Stampit and ES6

a.js

import B from './b';
import C from './c';

const A = stampit()
.static({ $inject: [ B, C ] })
.init( ({ instance, args }) => {
  let [ instance._b, instance._c ] = args;
})
.methods({
  doSomething () {
    return this._b.doIt();
  }
});

export default A;

a.test.js

import A from './a';
import B from './b';
import mockB from './mockB';

let injector = Injector( {}, mockB );
injector.get( A )
.then( function ( a ) {
  a.doSomething();
  // -> 'mock!'
});

injector.get( [ A, B] )
.then( function ( a, b ) {
  // have both
});

app.js

import A from './a';
import {Injector} from './di';

let injector = Injector( {/* config */}, /* ...mocks */ );
let a = injector.get( A );
a.doSomething();

mockB.js

import B from './b';

const mockB = stampit()
.static({ $provides: B })
.methods({
  doIt () {
    return 'mock!';
  }
})
;

export default mockB;