import type { Matrix3x3, Vec3 } from '../math';
export declare const ZONE_AXIS_MODE_LABELS: {
    readonly uvw: "Zone axis [uvw]";
    readonly hkl: "Plane normal (hkl)";
};
export type ZoneAxisMode = keyof typeof ZONE_AXIS_MODE_LABELS;
export declare function zone_axis_direction(matrix: Matrix3x3, indices: Vec3, mode: ZoneAxisMode): Vec3;
export declare const is_valid_zone_axis: (indices: Vec3) => boolean;