import { Feed, FeedItem, FeedAuthor, FeedCategory, FeedImage, FeedFormat, FeedOptions, FeedOutput, FeedExtensions, PodcastFeed } from "./types.js";
/**
 * Fluent builder for constructing feeds incrementally.
 *
 * @example
 * ```ts
 * const rss = new FeedBuilder()
 *   .title("My Blog")
 *   .link("https://example.com")
 *   .description("Latest posts.")
 *   .addItem({ id: "1", title: "Hello", content: "<p>World</p>" })
 *   .generate("rss");
 * ```
 */
export declare class FeedBuilder {
    private feed;
    private opts;
    title(title: string): this;
    link(link: string): this;
    description(description: string): this;
    id(id: string): this;
    language(language: string): this;
    copyright(copyright: string): this;
    updated(updated: string | Date): this;
    generator(generator: string): this;
    image(image: FeedImage): this;
    favicon(favicon: string): this;
    author(author: FeedAuthor): this;
    category(category: FeedCategory): this;
    nextUrl(nextUrl: string): this;
    podcast(podcast: PodcastFeed): this;
    ttl(ttl: number): this;
    skipHours(hours: number[]): this;
    skipDays(days: string[]): this;
    feedLinks(links: {
        rss?: string;
        atom?: string;
        json?: string;
        hub?: string;
    }): this;
    hub(url: string): this;
    extensions(ext: FeedExtensions): this;
    stylesheet(url: string): this;
    addItem(item: FeedItem): this;
    addItems(items: FeedItem[]): this;
    /** Build the feed data object without rendering. */
    build(): Feed;
    /** Render the feed in a single format. */
    generate(format: FeedFormat, options?: FeedOptions): string;
    /** Render all three formats at once. */
    generateAll(options?: FeedOptions): FeedOutput;
}