Explicitly initialize an EventBus instance (#593)

Co-authored-by: Dan Ott <dan@dtott.com>

src/Document.jsx

@@ -14,6 +14,7 @@ import Message from './Message';
 
 import LinkService from './LinkService';
 import PasswordResponses from './PasswordResponses';
+import eventBus from './eventBus';
 
 import {
   cancelRunningTask,
@@ -60,7 +61,7 @@ export default class Document extends PureComponent {
     },
   };
 
-  linkService = new LinkService();
+  linkService = new LinkService({ eventBus });
 
   componentDidMount() {
     this.loadDocument();

src/Page/AnnotationLayer.spec.jsx

@@ -5,6 +5,7 @@ import { pdfjs } from '../entry.jest';
 
 import { AnnotationLayerInternal as AnnotationLayer } from './AnnotationLayer';
 import LinkService from '../LinkService';
+import eventBus from '../eventBus';
 
 import failingPage from '../../__mocks__/_failing_page';
 
@@ -17,7 +18,7 @@ const pdfFile = loadPDF('./__mocks__/_pdf.pdf');
 /* eslint-disable comma-dangle */
 
 describe('AnnotationLayer', () => {
-  const linkService = new LinkService();
+  const linkService = new LinkService({ eventBus });
 
   // Loaded page
   let page;

src/eventBus.js

@@ -0,0 +1,3 @@
+import { EventBus } from 'pdfjs-dist/lib/web/ui_utils';
+
+export default new EventBus();