In France , there were a few military ones in the East . , most closed now.
Landing was never a problem upslope. But take off in both direction was. in my military training we were told 1% slope = 22% more take off run and Tail wind +10% for every 2 knots. You had to calculate carefully which direction. In Courchevel you have no choice , always downhill or wait as it is an 18% slope there ...