@wordpress/data/build-module/utils/emitter.mjs

Data module for WordPress.

// packages/data/src/utils/emitter.ts
function createEmitter() {
  let isPaused = false;
  let isPending = false;
  const listeners = /* @__PURE__ */ new Set();
  let clonedListeners = null;
  const notifyListeners = () => {
    clonedListeners ??= Array.from(listeners);
    const currentListeners = clonedListeners;
    for (let i = 0; i < currentListeners.length; i++) {
      currentListeners[i]();
    }
  };
  return {
    get isPaused() {
      return isPaused;
    },
    subscribe(listener) {
      listeners.add(listener);
      clonedListeners = null;
      return () => {
        listeners.delete(listener);
        clonedListeners = null;
      };
    },
    pause() {
      isPaused = true;
    },
    resume() {
      isPaused = false;
      if (isPending) {
        isPending = false;
        notifyListeners();
      }
    },
    emit() {
      if (isPaused) {
        isPending = true;
        return;
      }
      notifyListeners();
    }
  };
}
export {
  createEmitter
};
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