Function indicate_typing 

pub async fn indicate_typing(
    recipient: impl Into<UserID>,
    token: &Token,
) -> Result<Response<()>, Error>

Displays a visual typing indicator for the recipient.

The typing indicator will display for 3 seconds or until the authenticated user sends a message to the recipient, whichever comes first.

Twitter warns that sending this request for every typing event will likely quickly come across rate limits (1000 requests per 15 minutes). Instead, they recommend capturing these input events and limiting API requests to some slower rate based on the behavior of your users and the Twitter rate limit constraints.

Note that while this function accepts any UserID, the underlying Twitter API call only accepts a numeric ID for the sender. If you pass a string Screen Name to this function, a separate user lookup will occur prior to sending the read receipt. To avoid this extra lookup, pass a numeric ID (or the UserID::ID variant of UserID) to this function.