I want to create wrapper for node-telegram-bot-api, but typescript is able to resolve only last overload of function TelegramBot.on()
on(event: 'callback_query', listener: (query: TelegramBot.CallbackQuery) => void): this;
on(event: 'inline_query', listener: (query: TelegramBot.InlineQuery) => void): this;
on(event: 'poll_answer', listener: (answer: TelegramBot.PollAnswer) => void): this;
on(event: 'chat_member' | 'my_chat_member', listener: (member: TelegramBot.ChatMemberUpdated) => void): this;
on(event: 'chosen_inline_result', listener: (result: TelegramBot.ChosenInlineResult) => void): this;
on(
event:
| 'channel_post'
| 'edited_message'
| 'edited_message_text'
| 'edited_message_caption'
| 'edited_channel_post'
| 'edited_channel_post_text'
| 'edited_channel_post_caption',
listener: (message: TelegramBot.Message) => void,
): this;
on(event: 'shipping_query', listener: (query: TelegramBot.ShippingQuery) => void): this;
on(event: 'pre_checkout_query', listener: (query: TelegramBot.PreCheckoutQuery) => void): this;
on(event: 'polling_error' | 'webhook_error' | 'error', listener: (error: Error) => void): this;
on(event: 'chat_join_request', listener: (query: TelegramBot.ChatJoinRequest) => void): this;
i created generic type
export type TOnType = TelegramBot['on']
export type Handler<T> = TOnType extends (e:T, a: infer R) => void ? R : never
and it works with
const handler: Handler<'chat_join_request'> = (mes) => 3
but doesn't with
const handler: Handler<'callback_query'> = (mes) => 3
