chore: merge blocksuite source code (#9213)

blocksuite/playground/apps/starter/data/preset.ts

@@ -0,0 +1,36 @@
+import { MarkdownTransformer } from '@blocksuite/blocks';
+import { type DocCollection, Text } from '@blocksuite/store';
+
+import type { InitFn } from './utils.js';
+
+const presetMarkdown = `Click the 🔁 button to switch between editors dynamically - they are fully compatible!`;
+
+export const preset: InitFn = async (collection: DocCollection, id: string) => {
+  const doc = collection.createDoc({ id });
+  doc.load();
+  // Add root block and surface block at root level
+  const rootId = doc.addBlock('affine:page', {
+    title: new Text('BlockSuite Playground'),
+  });
+  doc.addBlock('affine:surface', {}, rootId);
+
+  // Add note block inside root block
+  const noteId = doc.addBlock(
+    'affine:note',
+    { xywh: '[0, 100, 800, 640]' },
+    rootId
+  );
+
+  // Import preset markdown content inside note block
+  await MarkdownTransformer.importMarkdownToBlock({
+    doc,
+    blockId: noteId,
+    markdown: presetMarkdown,
+  });
+
+  doc.resetHistory();
+};
+
+preset.id = 'preset';
+preset.displayName = 'BlockSuite Starter';
+preset.description = 'Start from friendly introduction';