import { type CacheabilityArgs as CacheabilityArguments, type Metadata } from './types.cts';
/**
 * A utility class to parse, store and print HTTP cache headers.
 */
export declare class Cacheability {
    private static _headerKeys;
    private static _getDirectives;
    private static _parseCacheControl;
    private static _parseHeaders;
    private static _setDefaultMetadata;
    private static _setMetadata;
    private static _setTTL;
    private static _validateMetadata;
    /**
     * The property holds the Cacheability instance's parsed cache
     * headers data, including cache control directives, etag, and
     * a derived TTL timestamp.
     */
    readonly metadata: Metadata;
    constructor(arguments_?: CacheabilityArguments);
    /**
     * The method checks whether the TTL timestamp stored in the Cacheability
     * instance is still valid, by comparing it to the current timestamp.
     */
    checkTTL(): boolean;
    /**
     * The method prints a cache-control header field value based on
     * the Cacheability instance's metadata. The max-age and/or s-maxage
     * are derived from the TTL stored in the metadata.
     */
    printCacheControl(): string;
}
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