Flip Y and Flip X Sprite Renderer's option not showing or recognizing

Hello!

I'm doing a game with a friend, and something is not right with the Sprite Renderer. My partner wrote a code which uses "SpriteRenderer.flipY and SpriteRenderer.flipX" and sent to me. For some reason, my unity (that is up to date, I checked) is not recognizing those options, resulting in compiler errors.
Anybody can help me with that? I really need to use this in my game.