function sendTypingMessage(recipientId) {
  let messageData = {
    recipient: {
      id: recipientId
    },
    sender_action: 'typing_on'
  }
  callSendAPI(messageData)
}
/**
 * Send a "Typing" icon to specify Messenger user.
 * @param {string} recipientId Messenger user to receive this message
 * Note: Typing message info: https://developers.facebook.com/docs/messenger-platform/send-api-reference/sender-actions
 */
Send a "Typing" icon to specify Messenger user.
Send a " Typing " icon to specify Messenger user .
function sendTypingMessage(recipientId) {
  let messageData = {
    recipient: {
      id: recipientId
    },
    sender_action: 'typing_on'
  }
  callSendAPI(messageData)
}
function sendTypingMessage ( recipientId ) { let messageData = { recipient : { id : recipientId } , sender_action : 'typing_on' } callSendAPI ( messageData ) }
Send a "Typing" icon to specify Messenger user.
Send a " Typing " icon to specify Messenger user .