/**
 * Describes a normalized sector by angles. Normalized meaning it supposed to work with
 * SVG with viewBox="-1 -1 2 2" so that 0 coordinates in cartesian and polar match the same spot.
 * Everything is multiplied by 100 (including viewBox of SVG to host this) so IE properly
 * handles hover events.
 *
 * @param startAngle starting angle in degrees
 * @param endAngle ending angle in degrees
 */
export declare function tuiDescribeSector(startAngle?: number, endAngle?: number): string;