Custom preset easing strings.
const str1: PresetLinearEasingKey = 'power2-in';const str2: PresetLinearEasingKey = 'expo-in-out';const str3: PresetLinearEasingKey = 'expo'; // INVALID Copy
const str1: PresetLinearEasingKey = 'power2-in';const str2: PresetLinearEasingKey = 'expo-in-out';const str3: PresetLinearEasingKey = 'expo'; // INVALID
Custom preset easing strings.