/** Convert `degrees` to radians. */
export declare function degToRad(degrees: number): number;
/** Return the shortest signed difference between angles `from` and `to` (radians).
 *
 *  The result is in `(-π, π]`. Useful for rotating a value toward a target by
 *  the minimum arc.
 */
export declare function deltaAngle(from: number, to: number): number;
/** Wrap `radians` to the range `[-π, π)`. */
export declare function normalizeAngle(radians: number): number;
/** Convert `radians` to degrees. */
export declare function radToDeg(radians: number): number;
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