Hi, I just looking for a development guide for TypeScript.

Or maybe just an interface LineClient or LineAction got export is enough for me.

The reason is bottender now got have interfaces of Action, Client, Event and Props etc. It's wonderful.

With these interfaces, I can say const SayHi: Action<Client, Event>, which with argument interfaces context.sendText and props?.next and

Given the following example from the documentation:
https://docs.cmtelecom.com/en/api/business-messaging-api/1.0/index#abc-suggestions

{
    "messages": {
        "authentication": {
            "productToken": "your product token"
        },
        "msg": [
            {
                "richContent": {
                    "conversation": [{
                        "text":