chore: merge blocksuite source code (#9213)

blocksuite/framework/inline/src/utils/guard.ts

@@ -0,0 +1,29 @@
+import { VElement, VLine } from '../components/index.js';
+
+export function isNativeTextInVText(text: unknown): text is Text {
+  return text instanceof Text && text.parentElement?.dataset.vText === 'true';
+}
+
+export function isVElement(element: unknown): element is HTMLElement {
+  return (
+    element instanceof HTMLElement &&
+    (element.dataset.vElement === 'true' || element instanceof VElement)
+  );
+}
+
+export function isVLine(element: unknown): element is HTMLElement {
+  return (
+    element instanceof HTMLElement &&
+    (element instanceof VLine || element.parentElement instanceof VLine)
+  );
+}
+
+export function isInEmptyLine(element: Node) {
+  const el = element instanceof Element ? element : element.parentElement;
+  const vLine = el?.closest<VLine>('v-line');
+  return !!vLine && vLine.vTextLength === 0;
+}
+
+export function isInlineRoot(element: unknown): element is HTMLElement {
+  return element instanceof HTMLElement && element.dataset.vRoot === 'true';
+}