import type { FeedBlock } from "./feed-blocks.js";
export interface TranscriptWindowRow {
    readonly key: string;
    readonly line: string;
    readonly block: FeedBlock;
    readonly lineIndex: number | undefined;
}
export interface TranscriptWindow {
    readonly rows: readonly TranscriptWindowRow[];
    readonly height: number;
    readonly totalRows: number;
    readonly maxOffset: number;
    readonly offset: number;
    readonly scrollAbove: number;
    readonly scrollBelow: number;
    readonly viewportRows: number;
    readonly firstItemId: string | undefined;
    readonly lastItemId: string | undefined;
    readonly visibleItemIds: ReadonlySet<string>;
}
export declare function flattenBlocks(blocks: readonly FeedBlock[]): readonly TranscriptWindowRow[];
export declare function totalTranscriptRows(blocks: readonly FeedBlock[]): number;
export declare function planTranscriptWindow(flat: readonly TranscriptWindowRow[], budget: number, offsetFromBottom: number): TranscriptWindow;