import type { BackupServerAPI } from './types.js';
export type BackupTier = 'hourly' | 'daily' | 'weekly' | 'startup';
export interface BackupCompletedEvent {
    type: 'backup-completed';
    tier: BackupTier;
    timestamp: string;
    localResult: 'success' | 'failure';
    localError?: string;
    localBytes?: number;
    backupId?: string;
    cloudResult?: 'success' | 'failure' | 'skipped';
    cloudError?: string;
    cloudTarget?: 'gdrive' | 'smb' | 'local';
    freeBytes: number;
    totalBytes: number;
    nextScheduled: {
        hourly: string;
        daily: string;
        weekly: string;
    };
}
interface DeltaEmitterState {
    app: BackupServerAPI;
    baseUrl: string;
    config: {
        emitSignalKDeltas: boolean;
    };
    abortController: AbortController;
    metaEmitted: boolean;
    lastSuccessByTier: Map<BackupTier, number>;
    activeNotifications: Set<string>;
    reconnectTimer: NodeJS.Timeout | null;
    reconnectDelayMs: number;
    stopped: boolean;
}
export declare function startSignalKEmitter(app: BackupServerAPI, baseUrl: string, config: {
    emitSignalKDeltas: boolean;
}): void;
export declare function stopSignalKEmitter(): void;
export declare function handleEvent(s: DeltaEmitterState, event: BackupCompletedEvent): void;
export declare const __test_only__: {
    /** Inject a fresh state for tests; returns the test handle. */
    bootstrap(app: BackupServerAPI): DeltaEmitterState;
    handleEvent: typeof handleEvent;
    STORAGE_LOW_WARN: number;
    STORAGE_LOW_ALERT: number;
    STORAGE_LOW_CLEAR: number;
};
export {};
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