EasingType: "linear" | "quad-in" | "quad-out" | "quad-in-out" | "cubic-in" | "cubic-out" | "cubic-in-out" | "quart-in" | "quart-out" | "quart-in-out" | "expo-in" | "expo-out" | "expo-in-out" | "circ-in" | "circ-out" | "circ-in-out" | "back-in" | "back-out" | "back-in-out" | "elastic-in" | "elastic-out" | "elastic-in-out" | "bounce-in" | "bounce-out" | "bounce-in-out"