/**
 * Mathematical curve functions for Daylight Simulation
 */
/**
 * Hann window function
 * @param x Progress through the day (0 to 1)
 */
export declare function hannCurve(x: number): number;
/**
 * Curve with a wider plateau in the middle
 * @param x Progress through the day (0 to 1)
 * @param width Width of the plateau
 */
export declare function widerMiddleCurve(x: number, width?: 'small' | 'medium' | 'large'): number;
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