import { DefuddleMetadata, MetaTagItem } from './types';
export declare class MetadataExtractor {
    static extract(doc: Document, schemaOrgData: any, metaTags: MetaTagItem[]): DefuddleMetadata;
    private static isPlaceholderValue;
    private static firstValid;
    private static getAuthor;
    private static extractByline;
    private static cleanAuthorString;
    private static getSiteName;
    private static getBestTitle;
    private static isSiteIdentifier;
    private static cleanTitle;
    private static trySeparatorSplit;
    private static getDescription;
    private static getImage;
    private static getLanguage;
    /**
     * Normalize language codes to BCP 47 format (e.g. en_US -> en-US)
     */
    private static normalizeLangCode;
    private static getFavicon;
    private static getPublished;
    private static getMetaContent;
    private static getMetaContents;
    private static getTimeElement;
    private static isLinkedToOtherPage;
    private static readonly MONTH_MAP;
    static parseDateText(text: string): string;
    private static getVisibleText;
    private static getAuthorName;
    private static getSchemaProperty;
}