@mui/material/utils/useSlot.js

'use client';

import useForkRef from '@mui/utils/useForkRef';
import appendOwnerState from '@mui/utils/appendOwnerState';
import resolveComponentProps from '@mui/utils/resolveComponentProps';
import mergeSlotProps from '@mui/utils/mergeSlotProps';
/**
 * An internal function to create a Material UI slot.
 *
 * This is an advanced version of Base UI `useSlotProps` because Material UI allows leaf component to be customized via `component` prop
 * while Base UI does not need to support leaf component customization.
 *
 * @param {string} name: name of the slot
 * @param {object} parameters
 * @returns {[Slot, slotProps]} The slot's React component and the slot's props
 *
 * Note: the returned slot's props
 * - will never contain `component` prop.
 * - might contain `as` prop.
 */
export default function useSlot(
/**
 * The slot's name. All Material UI components should have `root` slot.
 *
 * If the name is `root`, the logic behaves differently from other slots,
 * e.g. the `externalForwardedProps` are spread to `root` slot but not other slots.
 */
name, parameters) {
  const {
    className,
    elementType: initialElementType,
    ownerState,
    externalForwardedProps,
    getSlotOwnerState,
    internalForwardedProps,
    ...useSlotPropsParams
  } = parameters;
  const {
    component: rootComponent,
    slots = {
      [name]: undefined
    },
    slotProps = {
      [name]: undefined
    },
    ...other
  } = externalForwardedProps;
  const elementType = slots[name] || initialElementType;

  // `slotProps[name]` can be a callback that receives the component's ownerState.
  // `resolvedComponentsProps` is always a plain object.
  const resolvedComponentsProps = resolveComponentProps(slotProps[name], ownerState);
  const {
    props: {
      component: slotComponent,
      ...mergedProps
    },
    internalRef
  } = mergeSlotProps({
    className,
    ...useSlotPropsParams,
    externalForwardedProps: name === 'root' ? other : undefined,
    externalSlotProps: resolvedComponentsProps
  });
  const ref = useForkRef(internalRef, resolvedComponentsProps?.ref, parameters.ref);
  const slotOwnerState = getSlotOwnerState ? getSlotOwnerState(mergedProps) : {};
  const finalOwnerState = {
    ...ownerState,
    ...slotOwnerState
  };
  const LeafComponent = name === 'root' ? slotComponent || rootComponent : slotComponent;
  const props = appendOwnerState(elementType, {
    ...(name === 'root' && !rootComponent && !slots[name] && internalForwardedProps),
    ...(name !== 'root' && !slots[name] && internalForwardedProps),
    ...mergedProps,
    ...(LeafComponent && {
      as: LeafComponent
    }),
    ref
  }, finalOwnerState);
  Object.keys(slotOwnerState).forEach(propName => {
    delete props[propName];
  });
  return [elementType, props];
}