export declare const SURROGATE_KEY_SEPARATOR = ", ";
export declare const RENDERED_HTML_SURROGATE_KEY = "cwa-html";
export interface ApiCacheDirectives {
    storable: boolean;
    sharedMaxAge?: number;
}
export interface PageCacheOptions {
    enabled: boolean;
    sharedMaxAge?: number;
    staleWhileRevalidate: number;
}
export interface PageCacheDecision {
    surrogateKey?: string;
    cacheControl?: string;
    unstorable?: true;
}
export interface ResponseHeadersLike {
    get: (name: string) => string | null;
}
export interface BuildPageCacheHeadersEvent {
    ids: string[];
    api: ApiCacheDirectives;
    options: PageCacheOptions;
}
declare module 'h3' {
    interface H3EventContext {
        cwaPageCache?: PageCacheDecision;
    }
}
export declare function readResponseCacheDirectives(headers: ResponseHeadersLike): ApiCacheDirectives;
export declare function mergeCacheDirectives(a: ApiCacheDirectives, b: ApiCacheDirectives): ApiCacheDirectives;
export declare function buildPageCacheHeaders({ ids, api, options }: BuildPageCacheHeadersEvent): PageCacheDecision;
export declare function resolvePageCacheOptions(options?: Partial<PageCacheOptions>): PageCacheOptions;