code-lab/node_modules/vuetify/lib/components/transitions/expand-transition.mjs

// Utilities
import { camelize } from 'vue';
export default function () {
  let expandedParentClass = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';
  let x = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
  const sizeProperty = x ? 'width' : 'height';
  const offsetProperty = camelize(`offset-${sizeProperty}`);
  return {
    onBeforeEnter(el) {
      el._parent = el.parentNode;
      el._initialStyle = {
        transition: el.style.transition,
        overflow: el.style.overflow,
        [sizeProperty]: el.style[sizeProperty]
      };
    },
    onEnter(el) {
      const initialStyle = el._initialStyle;
      el.style.setProperty('transition', 'none', 'important');
      // Hide overflow to account for collapsed margins in the calculated height
      el.style.overflow = 'hidden';
      const offset = `${el[offsetProperty]}px`;
      el.style[sizeProperty] = '0';
      void el.offsetHeight; // force reflow

      el.style.transition = initialStyle.transition;
      if (expandedParentClass && el._parent) {
        el._parent.classList.add(expandedParentClass);
      }
      requestAnimationFrame(() => {
        el.style[sizeProperty] = offset;
      });
    },
    onAfterEnter: resetStyles,
    onEnterCancelled: resetStyles,
    onLeave(el) {
      el._initialStyle = {
        transition: '',
        overflow: el.style.overflow,
        [sizeProperty]: el.style[sizeProperty]
      };
      el.style.overflow = 'hidden';
      el.style[sizeProperty] = `${el[offsetProperty]}px`;
      void el.offsetHeight; // force reflow

      requestAnimationFrame(() => el.style[sizeProperty] = '0');
    },
    onAfterLeave,
    onLeaveCancelled: onAfterLeave
  };
  function onAfterLeave(el) {
    if (expandedParentClass && el._parent) {
      el._parent.classList.remove(expandedParentClass);
    }
    resetStyles(el);
  }
  function resetStyles(el) {
    const size = el._initialStyle[sizeProperty];
    el.style.overflow = el._initialStyle.overflow;
    if (size != null) el.style[sizeProperty] = size;
    delete el._initialStyle;
  }
}
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