fix: restore missing exports (#610)

.changeset/eight-dogs-burn.md

+---
+"llamaindex": patch
+"@llamaindex/core-test": patch
+---
+
+- Add missing exports:
+  - `IndexStructType`,
+  - `IndexDict`,
+  - `jsonToIndexStruct`,
+  - `IndexList`,
+  - `IndexStruct`
+- Fix `IndexDict.toJson()` method

packages/core/src/indices/index.ts

 export * from "./BaseIndex.js";
+export * from "./IndexStruct.js";
+export * from "./json-to-index-struct.js";
 export * from "./keyword/index.js";
 export * from "./summary/index.js";
 export * from "./vectorStore/index.js";

packages/core/src/indices/json-to-index-struct.ts

@@ -24,9 +24,15 @@ export class IndexDict extends IndexStruct {
   }
 
   toJson(): Record<string, unknown> {
+    const nodesDict: Record<string, unknown> = {};
+
+    for (const [key, node] of Object.entries(this.nodesDict)) {
+      nodesDict[key] = node.toJSON();
+    }
+
     return {
       ...super.toJson(),
-      nodesDict: this.nodesDict,
+      nodesDict,
       type: this.type,
     };
   }

packages/core/tests/indices/json-to-index-struct.test.ts

+import {
+  IndexDict,
+  IndexList,
+  IndexStruct,
+  IndexStructType,
+  MetadataMode,
+  TextNode,
+  jsonToIndexStruct,
+} from "llamaindex";
+import { describe, expect, it } from "vitest";
+
+describe("jsonToIndexStruct", () => {
+  it("transforms json to IndexDict", () => {
+    function isIndexDict(some: IndexStruct): some is IndexDict {
+      return "type" in some && some.type === IndexStructType.SIMPLE_DICT;
+    }
+
+    const node = new TextNode({ text: "text", id_: "nodeId" });
+    const expected = new IndexDict();
+    expected.addNode(node);
+
+    console.log("expected.toJson()", expected.toJson());
+    const actual = jsonToIndexStruct(expected.toJson());
+
+    expect(isIndexDict(actual)).toBe(true);
+    expect(
+      (actual as IndexDict).nodesDict.nodeId.getContent(MetadataMode.NONE),
+    ).toEqual("text");
+  });
+  it("transforms json to IndexList", () => {
+    function isIndexList(some: IndexStruct): some is IndexList {
+      return "type" in some && some.type === IndexStructType.LIST;
+    }
+
+    const node = new TextNode({ text: "text", id_: "nodeId" });
+    const expected = new IndexList();
+    expected.addNode(node);
+
+    const actual = jsonToIndexStruct(expected.toJson());
+
+    expect(isIndexList(actual)).toBe(true);
+    expect((actual as IndexList).nodes[0]).toEqual("nodeId");
+  });
+  it("fails for unknown index type", () => {
+    expect(() => {
+      const json = {
+        indexId: "dd120b16-8dce-4ce3-9bb6-15ca87fe4a1d",
+        summary: undefined,
+        nodesDict: {},
+        type: "FOO",
+      };
+      return jsonToIndexStruct(json);
+    }).toThrowError("Unknown index struct type: FOO");
+  });
+  it("fails for unknown node type", () => {
+    expect(() => {
+      const json = {
+        indexId: "dd120b16-8dce-4ce3-9bb6-15ca87fe4a1d",
+        summary: undefined,
+        nodesDict: {
+          nodeId: {
+            ...new TextNode({ text: "text", id_: "nodeId" }).toJSON(),
+            type: "BAR",
+          },
+        },
+        type: IndexStructType.SIMPLE_DICT,
+      };
+      return jsonToIndexStruct(json);
+    }).toThrowError("Invalid node type: BAR");
+  });
+});