import type { ReactNode } from 'react';
import type { VisionProNewsCategory, VisionProNewsCategoryObject, VisionProNewsFeed } from './VisionProNewsPage.types';
export type VisionProNewsSelection = {
    articleIndex: number;
    feedIndex: number;
};
export declare const VISION_PRO_NEWS_DEFAULT_BACKGROUND = "https://images.unsplash.com/photo-1495020689067-958852a7765e?auto=format&fit=crop&w=1600&q=84";
export declare const clampIndex: (index: number, length: number) => number;
export declare const getStableId: (id: string | number | undefined, fallback: number) => string;
export declare const getNodeLabel: (node: ReactNode, fallback: string) => string;
export declare const getFeedArticles: (feed: VisionProNewsFeed, maxArticlesPerFeed: number) => import("./VisionProNewsPage.types").VisionProNewsArticle[];
export declare const getFirstSelection: (feeds: readonly VisionProNewsFeed[], initialFeedId: string | undefined, initialArticleId: string | number | undefined, maxArticlesPerFeed: number) => VisionProNewsSelection;
export declare const formatArticleDate: (publishedAt?: Date | string) => string;
export declare const getDateTimeValue: (publishedAt?: Date | string) => string | undefined;
export declare const getLinkRel: (target?: string, rel?: string) => string | undefined;
export declare const getCounter: (feedIndex: number, articleIndex: number, maxArticlesPerFeed: number) => string;
export declare const normalizeCategory: (category: VisionProNewsCategory) => VisionProNewsCategoryObject;
export declare const isPresent: <T>(value: T | null | undefined) => value is T;