ant-design/style/core/motion/slide.less

.slide-motion(@className, @keyframeName) {
  .make-motion(@className, @keyframeName);
  .@{className}-enter {
    opacity: 0;
    animation-timing-function: @ease-out-circ;
  }
  .@{className}-leave {
    animation-timing-function: @ease-in-circ;
  }
}

.slide-motion(slide-up, slideUp);
.slide-motion(slide-down, slideDown);
.slide-motion(slide-left, slideLeft);
.slide-motion(slide-right, slideRight);

@keyframes slideUpIn {
  0% {
    opacity: 0;
    transform-origin: 0% 0%;
    transform: scaleY(0);
  }
  100% {
    opacity: 1;
    transform-origin: 0% 0%;
    transform: scaleY(1);
  }
}

@keyframes slideUpOut {
  0% {
    opacity: 1;
    transform-origin: 0% 0%;
    transform: scaleY(1);
  }
  100% {
    opacity: 0;
    transform-origin: 0% 0%;
    transform: scaleY(0);
  }
}

@keyframes slideDownIn {
  0% {
    opacity: 0;
    transform-origin: 100% 100%;
    transform: scaleY(0);
  }
  100% {
    opacity: 1;
    transform-origin: 100% 100%;
    transform: scaleY(1);
  }
}

@keyframes slideDownOut {
  0% {
    opacity: 1;
    transform-origin: 100% 100%;
    transform: scaleY(1);
  }
  100% {
    opacity: 0;
    transform-origin: 100% 100%;
    transform: scaleY(0);
  }
}

@keyframes slideLeftIn {
  0% {
    opacity: 0;
    transform-origin: 0% 0%;
    transform: scaleX(0);
  }
  100% {
    opacity: 1;
    transform-origin: 0% 0%;
    transform: scaleX(1);
  }
}

@keyframes slideLeftOut {
  0% {
    opacity: 1;
    transform-origin: 0% 0%;
    transform: scaleX(1);
  }
  100% {
    opacity: 0;
    transform-origin: 0% 0%;
    transform: scaleX(0);
  }
}

@keyframes slideRightIn {
  0% {
    opacity: 0;
    transform-origin: 100% 0%;
    transform: scaleX(0);
  }
  100% {
    opacity: 1;
    transform-origin: 100% 0%;
    transform: scaleX(1);
  }
}

@keyframes slideRightOut {
  0% {
    opacity: 1;
    transform-origin: 100% 0%;
    transform: scaleX(1);
  }
  100% {
    opacity: 0;
    transform-origin: 100% 0%;
    transform: scaleX(0);
  }
}