react/packages/react-native-renderer/src/ReactNativeComponentTree.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

const instanceCache = new Map();
const instanceProps = new Map();

export function precacheFiberNode(hostInst, tag) {
  instanceCache.set(tag, hostInst);
}

export function uncacheFiberNode(tag) {
  instanceCache.delete(tag);
  instanceProps.delete(tag);
}

function getInstanceFromTag(tag) {
  return instanceCache.get(tag) || null;
}

function getTagFromInstance(inst) {
  let nativeInstance = inst.stateNode;
  let tag = nativeInstance._nativeTag;
  if (tag === undefined) {
    nativeInstance = nativeInstance.canonical;
    tag = nativeInstance._nativeTag;
  }

  if (!tag) {
    throw new Error('All native instances should have a tag.');
  }

  return nativeInstance;
}

export {
  getInstanceFromTag as getClosestInstanceFromNode,
  getInstanceFromTag as getInstanceFromNode,
  getTagFromInstance as getNodeFromInstance,
};

export function getFiberCurrentPropsFromNode(stateNode) {
  return instanceProps.get(stateNode._nativeTag) || null;
}

export function updateFiberProps(tag, props) {
  instanceProps.set(tag, props);
}