export interface EventBus {
    emit(channel: string, data: unknown): void;
    on(channel: string, handler: (data: unknown) => void): () => void;
}
export interface EventBusController extends EventBus {
    clear(): void;
}
export declare function createEventBus(): EventBusController;
export interface PreparedEventBusCommit {
    commit(): void;
    rollback(): void;
}
export interface StagedEventBus {
    readonly bus: EventBus;
    prepareCommit(): PreparedEventBusCommit;
    commit(): void;
}
/** Isolate reload-candidate events from the live bus until publication. */
export declare function createStagedEventBus(target: EventBus): StagedEventBus;
/**
 * Register `facade` as forwarding to `bus`, so `canonicalEventBusFor(facade)`
 * resolves to `bus`.
 */
export declare function registerCanonicalEventBus(facade: object, bus: object): void;
/**
 * Resolve a scope object to the canonical EventBus it forwards to. A
 * registered per-extension `events` facade yields the shared bus behind it;
 * anything else — including a canonical bus itself — is returned unchanged,
 * so canonical buses are fixed points.
 */
export declare function canonicalEventBusFor(scope: object): object;
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