refactor: move settings.llm into core package (#1165)

packages/core/src/global/settings.ts

 import type { Tokenizer } from "@llamaindex/env";
+import type { LLM } from "../llms";
 import {
   type CallbackManager,
   getCallbackManager,
@@ -10,6 +11,7 @@ import {
   setChunkSize,
   withChunkSize,
 } from "./settings/chunk-size";
+import { getLLM, setLLM, withLLM } from "./settings/llm";
 import {
   getTokenizer,
   setTokenizer,
@@ -17,6 +19,15 @@ import {
 } from "./settings/tokenizer";
 
 export const Settings = {
+  get llm() {
+    return getLLM();
+  },
+  set llm(llm) {
+    setLLM(llm);
+  },
+  withLLM<Result>(llm: LLM, fn: () => Result): Result {
+    return withLLM(llm, fn);
+  },
   get tokenizer() {
     return getTokenizer();
   },

packages/core/src/global/settings/llm.ts

+import { AsyncLocalStorage } from "@llamaindex/env";
+import type { LLM } from "../../llms";
+
+const llmAsyncLocalStorage = new AsyncLocalStorage<LLM>();
+let globalLLM: LLM | undefined;
+
+export function getLLM(): LLM {
+  const currentLLM = globalLLM ?? llmAsyncLocalStorage.getStore();
+  if (!currentLLM) {
+    throw new Error(
+      "Cannot find LLM, please set `Settings.llm = ...` on the top of your code",
+    );
+  }
+  return currentLLM;
+}
+
+export function setLLM(llm: LLM): void {
+  globalLLM = llm;
+}
+
+export function withLLM<Result>(llm: LLM, fn: () => Result): Result {
+  return llmAsyncLocalStorage.run(llm, fn);
+}

packages/llamaindex/src/Settings.ts

@@ -27,7 +27,6 @@ export type PromptConfig = {
 
 export interface Config {
   prompt: PromptConfig;
-  llm: LLM | null;
   promptHelper: PromptHelper | null;
   embedModel: BaseEmbedding | null;
   nodeParser: NodeParser | null;
@@ -41,12 +40,10 @@ export interface Config {
  */
 class GlobalSettings implements Config {
   #prompt: PromptConfig = {};
-  #llm: LLM | null = null;
   #promptHelper: PromptHelper | null = null;
   #nodeParser: NodeParser | null = null;
   #chunkOverlap?: number;
 
-  #llmAsyncLocalStorage = new AsyncLocalStorage<LLM>();
   #promptHelperAsyncLocalStorage = new AsyncLocalStorage<PromptHelper>();
   #nodeParserAsyncLocalStorage = new AsyncLocalStorage<NodeParser>();
   #chunkOverlapAsyncLocalStorage = new AsyncLocalStorage<number>();
@@ -62,19 +59,19 @@ class GlobalSettings implements Config {
   }
 
   get llm(): LLM {
-    if (this.#llm === null) {
-      this.#llm = new OpenAI();
+    if (CoreSettings.llm === null) {
+      CoreSettings.llm = new OpenAI();
     }
 
-    return this.#llmAsyncLocalStorage.getStore() ?? this.#llm;
+    return CoreSettings.llm;
   }
 
   set llm(llm: LLM) {
-    this.#llm = llm;
+    CoreSettings.llm = llm;
   }
 
   withLLM<Result>(llm: LLM, fn: () => Result): Result {
-    return this.#llmAsyncLocalStorage.run(llm, fn);
+    return CoreSettings.withLLM(llm, fn);
   }
 
   get promptHelper(): PromptHelper {