- add refine chain type custom system message

- allow all memory type to conver_re_qa_chain
- fix startsWith undefined where override config file is not passed
- ability to generate new session id when sharing chatbot

packages/components/nodes/chains/ConversationalRetrievalQAChain/prompts.ts

@@ -27,7 +27,36 @@ export const map_reduce_template = `Given the following extracted parts of a lon
 Question: {question}
 Helpful Answer:`
 
-export const CUSTOM_QUESTION_GENERATOR_CHAIN_PROMPT = `Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question, in its original language. include it in the standalone question.
+export const refine_question_template = (sysPrompt?: string) => {
+    let returnPrompt = ''
+    if (sysPrompt)
+        returnPrompt = `Context information is below. 
+---------------------
+{context}
+---------------------
+Given the context information and not prior knowledge, ${sysPrompt}
+Answer the question: {question}.
+Answer:`
+    if (!sysPrompt)
+        returnPrompt = `Context information is below. 
+---------------------
+{context}
+---------------------
+Given the context information and not prior knowledge, answer the question: {question}.
+Answer:`
+    return returnPrompt
+}
+
+export const refine_template = `The original question is as follows: {question}
+We have provided an existing answer: {existing_answer}
+We have the opportunity to refine the existing answer (only if needed) with some more context below.
+------------
+{context}
+------------
+Given the new context, refine the original answer to better answer the question. 
+If you can't find answer from the context, return the original answer.`
+
+export const CUSTOM_QUESTION_GENERATOR_CHAIN_PROMPT = `Given the following conversation and a follow up question, rephrase the follow up question to be a standalone question, answer in the same language as the follow up question. include it in the standalone question.
 
 Chat History:
 {chat_history}