/**
 * Cross-tab messaging bus — BroadcastChannel with localStorage fallback.
 * No secrets on the wire; payloads must be non-sensitive sync signals only.
 */
export interface CrossTabEnvelope<TMessage extends {
    type: string;
}> {
    tabId: string;
    sequence: number;
    payload: TMessage;
}
export interface CrossTabPublishOptions {
    /**
     * When true (default), notify same-tab subscribers synchronously on publish.
     * Auth buses that already apply local side effects should pass false so
     * publish is cross-tab only (BroadcastChannel + storage) — avoids self-echo.
     */
    readonly notifyLocalSubscribers?: boolean;
}
export interface CrossTabBus<TMessage extends {
    type: string;
}> {
    publish(message: TMessage, options?: CrossTabPublishOptions): void;
    subscribe(handler: (msg: TMessage) => void): () => void;
    close(): void;
}
interface CrossTabBusOptions {
    readonly channelName: string;
    readonly debounceMs?: number;
}
export declare function createCrossTabBus<TMessage extends {
    type: string;
}>(options: CrossTabBusOptions): CrossTabBus<TMessage>;
export {};
//# sourceMappingURL=CrossTabBus.d.ts.map