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

The framework agnostic core that powers TanStack Query

// src/subscribable.ts
var Subscribable = class {
  constructor() {
    this.listeners = /* @__PURE__ */ new Set();
    this.subscribe = this.subscribe.bind(this);
  }
  subscribe(listener) {
    this.listeners.add(listener);
    this.onSubscribe();
    return () => {
      this.listeners.delete(listener);
      this.onUnsubscribe();
    };
  }
  hasListeners() {
    return this.listeners.size > 0;
  }
  onSubscribe() {
  }
  onUnsubscribe() {
  }
};
export {
  Subscribable
};
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