All files / src/services eventBus.ts

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// src/services/eventBus.ts
 
/**
 * A simple, generic event bus for cross-component communication without direct coupling.
 * This is particularly useful for broadcasting application-wide events, such as session expiry.
 */
 
type EventCallback = (data?: unknown) => void;
 
export class EventBus {
  private listeners: { [key: string]: EventCallback[] } = {};
 
  on(event: string, callback: EventCallback): void {
    if (!this.listeners[event]) {
      this.listeners[event] = [];
    }
    this.listeners[event].push(callback);
  }
 
  off(event: string, callback: EventCallback): void {
    if (!this.listeners[event]) return;
    this.listeners[event] = this.listeners[event].filter((l) => l !== callback);
  }
 
  dispatch(event: string, data?: unknown): void {
    if (!this.listeners[event]) return;
    this.listeners[event].forEach((callback) => callback(data));
  }
}
 
export const eventBus = new EventBus();