/**
 * This keeps both the CDN and browsers from caching the resource.
 * https://docs.fastly.com/en/guides/cache-control-tutorial#do-not-cache
 */
export declare const NoCache = "private, no-store";
export type BuildNoCacheHeaderOpts = {
    totalCacheLife: 0;
};
export type BuildFullCacheHeaderOpts = {
    staleIfError: number;
    staleWhileRevalidate: number;
    totalCacheLife: number;
};
export type BuildCacheHeaderOpts = BuildFullCacheHeaderOpts | BuildNoCacheHeaderOpts;
/**
 * Function that builds a proper cache-header string with `max-age`,
 * `stale-while-revalidate`, `stale-if-error` values. If the `totalCacheLife`
 * option or calculated `max-age` is 0, then will set a CDN-compatible
 * non-caching header.
 */
export declare function buildCacheHeader(opts: BuildNoCacheHeaderOpts): string;
export declare function buildCacheHeader(opts: BuildFullCacheHeaderOpts): string;
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