To clarify Airbus procedures if there is a Reactive Windshear warning. 'Windshear TOGA' and apply full thrust. NO config changes until both pilots confirm that they're out of the shear... Then PF will trigger the return to normal SOP with a 'Go Around Flaps' call.
Part of that return to normal SOP includes the 'positive climb' and then gear retraction. That may happen at quite an altitude depending on the severity of the windshear...