Desktop: PDF scroll persistence (#6747)

packages/pdf-viewer/main.tsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import shim from '@joplin/lib/shim';
+shim.setReact(React);
+import { render } from 'react-dom';
+import * as pdfjsLib from 'pdfjs-dist';
+import MiniViewerApp from './miniViewer';
+
+require('./viewer.css');
+
+// Setting worker path to worker bundle.
+pdfjsLib.GlobalWorkerOptions.workerSrc = 'pdf.worker.js';
+
+const url = window.frameElement.getAttribute('x-url');
+const type = window.frameElement.getAttribute('x-type');
+const appearance = window.frameElement.getAttribute('x-appearance');
+const anchorPage = window.frameElement.getAttribute('x-anchorPage');
+const pdfId = window.frameElement.getAttribute('id');
+
+document.documentElement.setAttribute('data-theme', appearance);
+
+function App() {
+	if (type === 'mini') {
+		return <MiniViewerApp pdfPath={url} isDarkTheme={appearance === 'dark'} anchorPage={anchorPage ? Number(anchorPage) : null} pdfId={pdfId} />;
+	}
+	return <div>Error: Unknown app type "{type}"</div>;
+}
+
+render(
+	<App/>,
+	document.getElementById('pdf-root')
+);