import type { DocumentVersion, PuckData } from '@pantheon-systems/css-client';
export interface PublishState {
    lastPublishedAt: Date | null;
    publishedSnapshot: PuckData | null;
    latestSnapshot: PuckData | null;
    changeCount: number;
}
/** Counts what would change on the live site if the latest version were published now. */
export declare function countPageChanges(before: PuckData, after: PuckData): number;
/** `versions` is newest-first, as `useVersions` sorts it. */
export declare function derivePublishState(versions: DocumentVersion[]): PublishState;