Telegex.get_chat_members_count

You're seeing just the function get_chat_members_count, go back to Telegex module for more information.
Link to this function

get_chat_members_count(chat_id)

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Specs

get_chat_members_count(integer() | String.t()) ::
  {:ok, integer()} | {:error, Telegex.Model.errors()}

Use this method to get the number of members in a chat. Returns Int on success.