import xtermHeadless from "@xterm/headless";
declare const Terminal: typeof xtermHeadless.Terminal;
type Terminal = InstanceType<typeof Terminal>;
export interface CellSnapshot {
    char: string;
    fg: string;
    bg: string;
}
export interface DiffResult {
    highlights: Map<string, string>;
    changedCells: number;
    changedRowRange: [number, number] | null;
}
/**
 * Capture a snapshot of the visible viewport — char + resolved colors per cell.
 */
export declare function captureBuffer(terminal: Terminal): CellSnapshot[][];
/**
 * Compare two buffer snapshots cell-by-cell. Returns a highlight map
 * compatible with RenderOptions.highlights.
 */
export declare function diffBuffers(before: CellSnapshot[][], after: CellSnapshot[][], excludeRows?: Set<number>): DiffResult;
export {};