export declare type TTag = {
    selectorAttr: string;
    selectorValue: string;
    attr: string;
};
export declare type TMetaTags<T> = {
    title?: T;
    description?: T;
    imageUrl?: T;
    siteName?: T;
    pageUrl?: T;
    author?: T;
    keywords?: T;
    viewport?: T;
    canonical?: T;
    [x: string]: T;
};
/**
 * @name MetasManager
 * @description Manage metas document head
 * In order to use this manager, title need be set in each page.
 *
 * Use manager as singleton
 * ex:
 *  MetasManager.inject({ title:"...", description:"...", ... })
 *
 */
export declare class MetasManager {
    private static AUTO_GENERATE_ATTR;
    static DEFAULT_META_TAGS: TMetaTags<TTag[]>;
    /**
     * Prevent non string return
     * @param metaValue
     */
    private static checkValue;
    /**
     * Select Meta value
     */
    private static selectMetaValue;
    /**
     * Inject meta tags and meta values
     * @description Inject metas tag elements in document <head>
     * @param values: Meta values to set et tag
     * @param tags: Meta tags properties to inquire or create
     * @param autoCreateMetaTag: Auto create meta tag if it doesn't exist in <head>
     * @param autoRemoveMetaTag: Auto remove meta tag if is value is ""
     */
    static inject({ values, tags, autoCreateMetaTag, autoRemoveMetaTag, }: {
        values?: TMetaTags<string>;
        tags?: TMetaTags<TTag[]>;
        autoCreateMetaTag?: boolean;
        autoRemoveMetaTag?: boolean;
    }): void;
}