import { Response } from 'node-fetch';
import { Duration, Instant } from './temporal';
export declare type CacheRuleParameters = {
    maxAge: Duration;
    sMaxAge: Duration;
    noCache: boolean;
    mustRevalidate: boolean;
    proxyRevalidate: boolean;
    noStore: boolean;
    private: boolean;
    public: boolean;
    mustUnderstand: boolean;
    noTransform: boolean;
    immutable: boolean;
    staleWhileRevalidate: Duration;
    staleIfError: Duration;
    ageBase: Instant;
};
export declare class CacheRules {
    readonly params: CacheRuleParameters;
    constructor(params: Partial<CacheRuleParameters>, now: () => Instant);
    validAt(instant: Instant): boolean;
}
export declare const defaultRules: (now: () => Instant) => CacheRuleParameters;
export declare function extractCacheRules(result: Response, now: () => Instant): CacheRules;