import type { DocStatus } from "./volume.js";
export interface CachedEntry {
    content: string | Uint8Array;
    status: DocStatus;
}
export interface SessionCacheOptions {
    /**
     * Lifetime of cache entries in milliseconds.
     *   undefined → 150_000 (2.5 min, multi-writer default)
     *   null      → never expires (single-writer max speed; only LRU evicts)
     *   0         → no cache (every get returns null after a tick)
     *   N>0       → expire after N ms
     *
     * Rationale: TTL is only useful when external writers exist. The default
     * is conservative for the multi-writer case. Single-writer apps should
     * pass `null` for max speed.
     */
    ttlMs?: number | null;
    maxBytes?: number;
    now?: () => number;
}
export declare class SessionCache {
    private entries;
    private currentBytes;
    private readonly ttlMs;
    private readonly maxBytes;
    private readonly now;
    constructor(opts?: SessionCacheOptions);
    get(path: string): CachedEntry | null;
    set(path: string, content: string | Uint8Array, status: DocStatus): void;
    delete(path: string): void;
    clear(): void;
    size(): number;
    totalBytes(): number;
}
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