react-native-gesture-handler/src/web_hammer/NodeManager.ts

Declarative API exposing native platform touch and gesture system to React Native

export const gestures: Record<number, any> = {};

export function getHandler(tag: number) {
  if (tag in gestures) {
    return gestures[tag];
  }

  throw new Error(`No handler for tag ${tag}`);
}

export function createGestureHandler(handlerTag: number, handler: any) {
  if (handlerTag in gestures) {
    throw new Error(`Handler with tag ${handlerTag} already exists`);
  }
  gestures[handlerTag] = handler;
  // @ts-ignore no types for web handlers yet
  gestures[handlerTag].handlerTag = handlerTag;
}

export function dropGestureHandler(handlerTag: number) {
  // Since React 18, there are cases where componentWillUnmount gets called twice in a row
  // so skip this if the tag was already removed.
  if (!(handlerTag in gestures)) {
    return;
  }
  getHandler(handlerTag).destroy();
  // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
  delete gestures[handlerTag];
}

export function getNodes() {
  return { ...gestures };
}