fix: export schema in top level (#1112)

packages/llamaindex/src/index.edge.ts

 import type { AgentEndEvent, AgentStartEvent } from "./agent/types.js";
 import type { RetrievalEndEvent, RetrievalStartEvent } from "./llm/types.js";
 
+export * from "@llamaindex/core/schema";
+
 declare module "@llamaindex/core/global" {
   export interface LlamaIndexEventMaps {
     "retrieve-start": RetrievalStartEvent;

packages/llamaindex/tests/import.test.ts

+import { expect, test } from "vitest";
+
+test("Node classes should be included in the top level", async () => {
+  const { Document, IndexNode, TextNode, BaseNode } = await import(
+    "llamaindex"
+  );
+  expect(Document).toBeDefined();
+  expect(IndexNode).toBeDefined();
+  expect(TextNode).toBeDefined();
+  expect(BaseNode).toBeDefined();
+});