import type { ArkmeTimelinePage } from './types.js';
import type { TimelineCacheCommit } from './unified-timeline-cache.js';
import type { ChatSyncCommand } from './chat-message-sync.js';
export type TimelineCacheCommand = {
    kind: 'reserve' | 'close' | 'invalidate-all';
} | {
    kind: 'sync';
    command: ChatSyncCommand;
} | {
    kind: 'read';
    scope: string;
    request: string;
    anchorId?: string;
    latest?: boolean;
} | {
    kind: 'write';
    scope: string;
    request: string;
    page: ArkmeTimelinePage;
    options: TimelineCacheCommit;
} | {
    kind: 'invalidate';
    scope: string;
    timelineItemKey?: string;
    terminal?: boolean;
    refreshOnly?: boolean;
} | {
    kind: 'invalidate-source';
    sourceKey: string;
    timelineItemKey?: string;
    terminal?: boolean;
    refreshOnly?: boolean;
};
export interface TimelineCachePort {
    /** False distinguishes a healthy worker's admission rejection from a dead worker. */
    readonly isClosed?: boolean;
    call<T>(command: TimelineCacheCommand): Promise<T>;
    close(): void;
}
/** One bounded worker per Host. SQL, JSON, cleanup and checkpoints never execute on the Host event loop. */
export declare class TimelineCacheWorker implements TimelineCachePort {
    private readonly worker;
    private readonly pending;
    private queuedBytes;
    private nextId;
    private closed;
    get isClosed(): boolean;
    private initialized;
    private readonly startupTimer;
    constructor(directory: string, workerUrl?: URL);
    call<T>(command: TimelineCacheCommand): Promise<T>;
    private fail;
    close(): void;
}
//# sourceMappingURL=timeline-cache-port.d.ts.map