react-native/Libraries/ReactNative/getCachedComponentWithDebugName.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 * @format
 */

import type {AbstractComponent, Node} from 'react';

type NoopComponent = AbstractComponent<{children: Node}>;

const cache: Map<
  string, // displayName
  NoopComponent, // ComponentWithDisplayName
> = new Map();

export default function getCachedComponentWithDisplayName(
  displayName: string,
): NoopComponent {
  let ComponentWithDisplayName = cache.get(displayName);

  if (!ComponentWithDisplayName) {
    ComponentWithDisplayName = ({
      children,
    }: $TEMPORARY$object<{children: Node}>) => children;
    ComponentWithDisplayName.displayName = displayName;
    cache.set(displayName, ComponentWithDisplayName);
  }

  return ComponentWithDisplayName;
}