I'm new to TypeScript, and frankly, I may be doing this wrong. But...I'm trying to create a "KeyUp Listener" for text-boxes that will "notify" when the user has stopped typing. However, when I try to register the class, I get the following error:

Exception: Call to Node module failed with error: Prerendering failed because of error: ReferenceError: HTMLElement is not defined

REGISTRATION:

// MODULES
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { UniversalModule } from 'angular2-universal';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';

// COMPONENTS
import { AppComponent } from './components/app/app.component'
import { HeaderComponent } from './components/shared/components/shared-header.component';
import { SampleIndexComponent } from './components/samples/sample.index.component';
import { SampleFormComponent } from './components/samples/sample.form.component';
import { StatusFilterComponent } from './components/samples/filters/status-filter.component';
import { AuthorFilterComponent } from './components/samples/filters/author-filter.component';

// LISTENERS
import { TextboxKeyUpListener } from "./components/shared/services/textbox.keyup.listener";

@NgModule({
    bootstrap: [ AppComponent ],
    declarations: [
        AppComponent,
        HeaderComponent,
        SampleIndexComponent,
        StatusFilterComponent,
        AuthorFilterComponent,
        SampleFormComponent
    ],
    imports: [
        UniversalModule, // <-- Must be first import. This automatically imports BrowserModule, HttpModule, and JsonpModule too.
        FormsModule,
        ReactiveFormsModule,
        RouterModule.forRoot([
            { path: '', redirectTo: 'samples', pathMatch: 'full' },
            { path: 'samples', component: SampleIndexComponent },
            { path: 'form', component: SampleFormComponent },
            { path: '**', redirectTo: 'samples' }
        ])
    ],
    providers: [AuthorFilterNotifier, StatusFilterNotifier, TextboxKeyUpListener]
})
export class AppModule
{
    constructor() { }   
}

NOTIFIER LOOKS LIKE:

// MODULES
import { Injectable, Inject } from '@angular/core';
import { Subject } from 'rxjs/Subject';

@Injectable()
export class TextboxKeyUpListener {

    // CONSTRUCTORS
    constructor(private textbox: HTMLInputElement)
    {
        this.init();
    }

    // PROPERTIES - private
    private typingTimer: NodeJS.Timer;
    private typingTimerInterval: number = 1000;
    private notifyDoneTyping = new Subject();

    // PROPERTIES - public
    public notifyDoneTyping$ = this.notifyDoneTyping.asObservable();

    // METHODS - public
    private keyUp(ev: KeyboardEvent)
    {
        global.clearTimeout(this.typingTimer);
        if(this.textbox.value)
            this.typingTimer = global.setTimeout(this.notify, this.typingTimerInterval);
    }

    // METHODS - private
    private init()
    {
        this.textbox.onkeyup = this.keyUp;
    }

    private notify()
    {
        this.notifyDoneTyping.next(this.textbox.value);
        console.log("Done Typing")
    }
}