const observerCallbacks = /* @__PURE__ */ new WeakMap();
const observers = /* @__PURE__ */ new WeakMap();
const fireObserverCallback = (entry) => {
  const callback = observerCallbacks.get(entry.target);
  callback && callback(entry);
};
const fireAllObserverCallbacks = (entries) => {
  entries.forEach(fireObserverCallback);
};
function initIntersectionObserver({ root, ...options }) {
  const lookupRoot = root || document;
  if (!observers.has(lookupRoot)) {
    observers.set(lookupRoot, {});
  }
  const rootObservers = observers.get(lookupRoot);
  const key = JSON.stringify(options);
  if (!rootObservers[key]) {
    rootObservers[key] = new IntersectionObserver(fireAllObserverCallbacks, { root, ...options });
  }
  return rootObservers[key];
}
function observeIntersection(element, options, callback) {
  const rootInteresectionObserver = initIntersectionObserver(options);
  observerCallbacks.set(element, callback);
  rootInteresectionObserver.observe(element);
  return () => {
    observerCallbacks.delete(element);
    rootInteresectionObserver.unobserve(element);
  };
}
export {
  observeIntersection
};
//# sourceMappingURL=dist-es-motion-features-viewport-observers.js.map
