fix instantiation

apps/simple/listIndex.ts

@@ -1,10 +1,20 @@
 import { Document } from "@llamaindex/core/src/Node";
 import { ListIndex, ListRetrieverMode } from "@llamaindex/core/src/index/list";
 import essay from "./essay";
+import { serviceContextFromDefaults } from "@llamaindex/core/src/ServiceContext";
+import { SimpleNodeParser } from "@llamaindex/core/src/NodeParser";
 
 async function main() {
+  const serviceContext = serviceContextFromDefaults({
+    nodeParser: new SimpleNodeParser({
+      chunkSize: 40,
+    }),
+  });
   const document = new Document({ text: essay });
-  const index = await ListIndex.fromDocuments([document]);
+  const index = await ListIndex.fromDocuments({
+    documents: [document],
+    serviceContext,
+  });
   const queryEngine = index.asQueryEngine(ListRetrieverMode.LLM);
   const response = await queryEngine.aquery(
     "What did the author do growing up?"

packages/core/src/index/list/ListIndex.ts

@@ -71,11 +71,12 @@ export class ListIndex extends BaseIndex<IndexList> {
     });
   }
 
-  static async fromDocuments(
-    documents: Document[],
-    storageContext?: StorageContext,
-    serviceContext?: ServiceContext
-  ): Promise<ListIndex> {
+  static async fromDocuments(args: {
+    documents: Document[];
+    storageContext?: StorageContext;
+    serviceContext?: ServiceContext;
+  }): Promise<ListIndex> {
+    let { documents, storageContext, serviceContext } = args;
     storageContext = storageContext ?? (await storageContextFromDefaults({}));
     serviceContext = serviceContext ?? serviceContextFromDefaults({});
     const docStore = storageContext.docStore;

packages/core/src/tests/CallbackManager.test.ts

@@ -134,11 +134,10 @@ describe("CallbackManager: onLLMStream and onRetrieve", () => {
   });
 
   test("For ListIndex w/ a ListIndexRetriever", async () => {
-    const listIndex = await ListIndex.fromDocuments(
-      [document],
-      undefined,
-      serviceContext
-    );
+    const listIndex = await ListIndex.fromDocuments({
+      documents: [document],
+      serviceContext,
+    });
     const queryEngine = listIndex.asQueryEngine();
     const query = "What is the author's name?";
     const response = await queryEngine.aquery(query);