export declare function extractPublishedDate(html: string, now?: number): number | undefined;
export declare function metaTags(html: string): Map<string, string>;
export declare function jsonLdDates(html: string): {
    published?: string;
    modified?: string;
};
export declare function resolveSince(value: string, now?: number): number | undefined;
export declare function toEpoch(s: string, now?: number): number | undefined;
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