main.go

	var (
		canPostSomeoneTypingMessage = func() func() bool {
			enable := true

			return func() bool {
				if !enable {
					return false
				}

				go func() {
					select {
					case <-time.After(10 * time.Minute):
						enable = true
					}
				}()
				defer func() { enable = false }()

				return enable
			}
		}()
	)