import { Title, Meta, MetaDefinition } from '@angular/platform-browser';
export declare class StyxHeadService {
    protected titleService: Title;
    protected metaService: Meta;
    private _primaryTitle;
    private _title;
    private _unread;
    private _theme;
    constructor(titleService: Title, metaService: Meta);
    private _getDOM;
    setTitle(title: string): void;
    setFullTitle(newTitle: string): void;
    setUnReadTitle(unread: number): void;
    getTitle(): string;
    addTag(tag: MetaDefinition, forceCreation?: boolean): HTMLMetaElement | null;
    addTags(tags: MetaDefinition[], forceCreation?: boolean): HTMLMetaElement[];
    updateTag(tag: MetaDefinition, selector?: string): HTMLMetaElement | null;
    removeTag(attrSelector: string): void;
    updateLink(selector: string, href: string): void;
}