export interface CachePolicy {
    enabled: boolean;
    ttlMs?: number;
    maxEntries?: number;
    bypass?: boolean;
    allowSessionHistory?: boolean;
}
export interface CacheEntry<T> {
    key: string;
    createdAt: number;
    value: T;
}
export interface CacheKeyParts {
    prompt: string;
    model: string;
    role: string;
    strategy: string;
    policyVersion: string;
    systemPrompt?: string;
    apiKind?: string;
    endpoint?: string;
    mode?: string;
    stage?: string;
}
export declare function cacheKey(parts: CacheKeyParts): string;
export declare function cacheKeyWhenEnabled(enabled: boolean, parts: CacheKeyParts): string | undefined;
export declare class RunCache<T> {
    private readonly directory;
    private readonly policy;
    private writesSincePrune;
    private pruning;
    constructor(directory: string, policy: CachePolicy);
    get(key: string): Promise<T | undefined>;
    set(key: string, value: T): Promise<void>;
    prune(force?: boolean): Promise<void>;
    private pruneNow;
}