Build upon a class found in an AngularJS 2 library

Whenever I attempt to inherit from a class that is part of a library built on https://github.com/jhades/angular2-library-example

For example, the class in the library:

export class Stuff {
    foo: string = "BAR";
}

And the class in my application:

export class SomeClass extends Stuff {
}

I consistently encounter the following error:

EXCEPTION: Uncaught (in promise): Error: Error in :0:0 caused by: Class constructor Stuff cannot be invoked without 'new'
TypeError: Class constructor Stuff cannot be invoked without 'new'
at new HomeComponent (http://localhost:3000/main.bundle.js:46859:16)
at new Wrapper_HomeComponent (/AppModule/HomeComponent/wrapper.ngfactory.js:7:18)
at CompiledTemplate.proxyViewClass.View_HomeComponent_Host0.createInternal (/AppModule/HomeComponent/host.ngfactory.js:15:29)
at CompiledTemplate.proxyViewClass.AppView.createHostView (http://localhost:3000/main.bundle.js:58198:21)
at CompiledTemplate.proxyViewClass.DebugAppView.createHostView (http://localhost:3000/main.bundle.js:58458:52)
at ComponentFactory.create (http://localhost:3000/main.bundle.js:28964:25)
at ViewContainerRef_.createComponent (http://localhost:3000/main.bundle.js:42370:45)
at RouterOutlet.activate (http://localhost:3000/main.bundle.js:46144:40)
at ActivateRoutes.placeComponentIntoOutlet (http://localhost:3000/main.bundle.js:15248:16)
at ActivateRoutes.activateRoutes (http://localhost:3000/main.bundle.js:15222:22)
at http://localhost:3000/main.bundle.js:15177:58
at Array.forEach (native)

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