@mui/utils/esm/useLazyRef/useLazyRef.js

Utility functions for React components.

'use client';

import * as React from 'react';
const UNINITIALIZED = {};

/**
 * A React.useRef() that is initialized lazily with a function. Note that it accepts an optional
 * initialization argument, so the initialization function doesn't need to be an inline closure.
 *
 * @usage
 *   const ref = useLazyRef(sortColumns, columns)
 */
export default function useLazyRef(init, initArg) {
  const ref = React.useRef(UNINITIALIZED);
  if (ref.current === UNINITIALIZED) {
    ref.current = init(initArg);
  }
  return ref;
}