/**
 * Diff engine: compares two CellBuffers and produces a minimal set of changes.
 */
import { CellBuffer } from "./buffer.js";
import { type Cell } from "./cell.js";
export interface CellChange {
    x: number;
    y: number;
    cell: Cell;
}
/**
 * Compute the diff between two buffers.
 * Returns an array of cell changes needed to transform `from` into `to`.
 */
export declare function diffBuffers(from: CellBuffer, to: CellBuffer): CellChange[];
/**
 * Group changes by row for more efficient cursor movement.
 * Returns changes grouped by y-coordinate.
 */
export declare function groupChangesByRow(changes: CellChange[]): Map<number, CellChange[]>;
/**
 * Detect consecutive runs in a row for even more efficient output.
 * A run is a sequence of consecutive x positions.
 */
export interface CellRun {
    x: number;
    y: number;
    cells: Cell[];
}
export declare function findRuns(changes: CellChange[]): CellRun[];
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