Easing

type Easing =
  | 'linear'
  | 'easeInQuad'
  | 'easeOutQuad'
  | 'easeInOutQuad'
  | 'easeInCubic'
  | 'easeOutCubic'
  | 'easeInOutCubic'
  | 'easeInQuart'
  | 'easeOutQuart'
  | 'easeInOutQuart'
  | 'easeInQuint'
  | 'easeOutQuint'
  | 'easeInOutQuint'
  | 'easeInSine'
  | 'easeOutSine'
  | 'easeInOutSine'
  | 'easeInExpo'
  | 'easeOutExpo'
  | 'easeInOutExpo'
  | 'easeInCirc'
  | 'easeOutCirc'
  | 'easeInOutCirc'
  | 'easeInBack'
  | 'easeOutBack'
  | 'easeInOutBack'
  | 'easeInElastic'
  | 'easeOutElastic'
  | 'easeInOutElastic'
  | 'easeInBounce'
  | 'easeInOutBounce'
  | 'easeOutBounce';