LlamaIndex Callback Handler

from llama_index.core.callbacks import CallbackManager
from llama_index.core.service_context import ServiceContext
import chainlit as cl



@cl.on_chat_start
async def start():
    service_context = ServiceContext.from_defaults(callback_manager=CallbackManager([cl.LlamaIndexCallbackHandler()]))
    # use the service context to create the predictor