ant-design-vue/components/_util/easings.js

export function easeInOutCubic(t, b, c, d) {
  const cc = c - b;
  t /= d / 2;
  if (t < 1) {
    return (cc / 2) * t * t * t + b;
  }
  return (cc / 2) * ((t -= 2) * t * t + 2) + b;
}