@tanstack/query-core/build/modern/onlineManager.js

The framework agnostic core that powers TanStack Query

// src/onlineManager.ts
import { Subscribable } from "./subscribable.js";
import { isServer } from "./utils.js";
var OnlineManager = class extends Subscribable {
  #online = true;
  #cleanup;
  #setup;
  constructor() {
    super();
    this.#setup = (onOnline) => {
      if (!isServer && window.addEventListener) {
        const onlineListener = () => onOnline(true);
        const offlineListener = () => onOnline(false);
        window.addEventListener("online", onlineListener, false);
        window.addEventListener("offline", offlineListener, false);
        return () => {
          window.removeEventListener("online", onlineListener);
          window.removeEventListener("offline", offlineListener);
        };
      }
      return;
    };
  }
  onSubscribe() {
    if (!this.#cleanup) {
      this.setEventListener(this.#setup);
    }
  }
  onUnsubscribe() {
    if (!this.hasListeners()) {
      this.#cleanup?.();
      this.#cleanup = void 0;
    }
  }
  setEventListener(setup) {
    this.#setup = setup;
    this.#cleanup?.();
    this.#cleanup = setup(this.setOnline.bind(this));
  }
  setOnline(online) {
    const changed = this.#online !== online;
    if (changed) {
      this.#online = online;
      this.listeners.forEach((listener) => {
        listener(online);
      });
    }
  }
  isOnline() {
    return this.#online;
  }
};
var onlineManager = new OnlineManager();
export {
  OnlineManager,
  onlineManager
};
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