/**
 * Navigation Row, where 0 is inactive cell, but 1 is active, e.g.
 * 0 0 1 1
 */
type NavigationRow = (0 | 1)[];
/**
 * Navigation Grid, where 0 is inactive cell, but 1 is active, e.g.
 * 0 0 1 1
 * 1 1 0 1
 * 1 0 1 1
 * 1 1 0 1
 */
type NavigationGrid = NavigationRow[];
/**
 * Cell, where first number is column index and second number is row index.
 * Indexes are zero-based
 */
type CellIndex = [number, number];
/**
 * Navigate left from the start cell.
 * If there is no active cell on the left,
 * than iterate over preceding rows to to find one
 * @param grid Navigation grid
 * @param cell Start cell
 * @returns cell Previous cell. If none return null
 */
declare const left: (grid: NavigationGrid, cell: CellIndex) => CellIndex | null;
/**
 * Navigate right from the start cell.
 * If there is no active cell on the right,
 * than iterate over following rows to to find one
 * @param grid Navigation grid
 * @param cell Start cell
 * @returns cell Next cell. If none return null
 */
declare const right: (grid: NavigationGrid, cell: CellIndex) => CellIndex | null;
/**
 * Navigate up from the start cell trying to
 * find the closest cell on the preceding rows
 * @param grid Navigation grid
 * @param cell Start cell
 * @returns cell Closest cell on the previous row. If none return null
 */
declare const up: (grid: NavigationGrid, cell: CellIndex) => CellIndex | null;
/**
 * Navigate down from the start cell trying to
 * find the closest cell on the following rows
 * @param grid Navigation grid
 * @param cell Start cell
 * @returns cell Closest cell on the next row. If none return null
 */
declare const down: (grid: NavigationGrid, cell: CellIndex) => CellIndex | null;
/**
 * Get the first active cell
 * @param grid Navigation grid
 * @returns cell The first active cell. If none return null
 */
declare const first: (grid: NavigationGrid) => CellIndex | null;
/**
 * Get the last active cell
 * @param grid Navigation grid
 * @returns cell The last active cell. If none return null
 */
declare const last: (grid: NavigationGrid) => CellIndex | null;
export { NavigationRow, NavigationGrid, CellIndex, right, left, down, up, first, last };