export declare const NOTIFY_FALLBACK_SCHEMA_VERSION = 1;
export declare const NOTIFY_FALLBACK_LEASE_MS = 30000;
export declare const NOTIFY_FALLBACK_RETRY_DELAY_MS = 250;
export declare const NOTIFY_FALLBACK_RETENTION_MS: number;
export declare const NOTIFY_FALLBACK_FUTURE_SKEW_MS: number;
type WatcherMode = 'persistent' | 'once';
export type FallbackDeliveryResult = {
    kind: 'acquired_effect';
    attempt: 1 | 2;
} | {
    kind: 'active_skip';
    reason: string;
} | {
    kind: 'retry_eligible';
    reason: string;
} | {
    kind: 'terminal_delivered' | 'terminal_ambiguous' | 'terminal_failed';
    attempt: 1 | 2;
} | {
    kind: 'invalid_skip' | 'io_skip' | 'deadline_skip';
    reason: string;
};
export interface HookSpawnResult {
    spawned: boolean;
    childPid?: number | null;
    status?: number | null;
    signal?: string | null;
    error?: unknown;
    timedOut?: boolean;
    terminationUnconfirmed?: boolean;
    authorityDeadline?: boolean;
}
export interface FallbackDeliveryOptions {
    stateDir: string;
    threadId: string;
    turnId: string;
    eventTimestampMs: number;
    rolloutPath: string;
    watcherMode: WatcherMode;
    deadlineAtMs: number;
    now?: () => number;
    stopping?: () => boolean;
    spawnHook: () => Promise<HookSpawnResult>;
}
export declare function deliverNotifyFallback(options: FallbackDeliveryOptions): Promise<FallbackDeliveryResult>;
export declare function compactNotifyFallbackDeliveries(stateDir: string, now?: number): Promise<void>;
export {};
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