text: import * as PropTypes from 'prop-types';
  import chainPropTypes from './chainPropTypes';
  
  function isClassComponent(elementType) {
    // elementType.prototype?.isReactComponent
    var _elementType$prototyp = elementType.prototype,
        prototype = _elementType$prototyp === void 0 ? {} : _elementType$prototyp;
    return Boolean(prototype.isReactComponent);
  }
  
  function elementTypeAcceptingRef(props, propName, componentName, location, propFullName) {
    var propValue = props[propName];
    var safePropName = propFullName || propName;
  
    if (propValue == null) {
      return null;
    }
  
    var warningHint;
    /**
     * Blacklisting instead of whitelisting
     *
     * Blacklisting will miss some components, such as React.Fragment. Those will at least
     * trigger a warning in React.
     * We can't whitelist because there is no safe way to detect React.forwardRef
     * or class components. "Safe" means there's no public API.
     *
     */
  
    if (typeof propValue === 'function' && !isClassComponent(propValue)) {
      warningHint = 'Did you accidentally provide a plain function component instead?';
    }
  
    if (warningHint !== undefined) {
      return new Error("Invalid ".concat(location, " `").concat(safePropName, "` supplied to `").concat(componentName, "`. ") + "Expected an element type that can hold a ref. ".concat(warningHint, " ") + 'For more information see https://mui.com/r/caveat-with-refs-guide');
    }
  
    return null;
  }
  
  export default chainPropTypes(PropTypes.elementType, elementTypeAcceptingRef);