export declare interface ChangelogBadgeOptions {
    /** The remote `rss.xml` URL. */
    readonly url: string;
    /** Poll interval. Defaults to 6 hours. */
    readonly intervalMs?: number;
}

export declare interface ChangelogBadgeState {
    readonly hasUnread: boolean;
    readonly latest: LatestRelease | null;
    /** Mark the current latest release as seen (clears the badge). */
    readonly markRead: () => void;
}

/** A version of the badge as a pure reducer over (latest, lastSeen). */
export declare const computeHasUnread: (latest: LatestRelease | null, lastSeen: string | null) => boolean;

/** The newest release as read off the remote feed. */
export declare interface LatestRelease {
    readonly title: string;
    readonly link: string;
    readonly slug: string;
    readonly pubDate: string;
}

/** Extract the first item's fields from an RSS feed string. Tiny + tolerant. */
export declare const parseFirstRssItem: (xml: string) => LatestRelease | null;

/**
 * In-product "What's new" badge state. Polls the feed on mount and every
 * `intervalMs`; returns `hasUnread` + the `latest` release + `markRead`.
 */
export declare const useChangelogBadge: (options: ChangelogBadgeOptions) => ChangelogBadgeState;

export { }