export function utci(tdb: any, tr: any, v: any, rh: any, units?: string, return_stress_category?: boolean, limit_inputs?: boolean): {
    utci: number;
    stress_category: string | number;
} | {
    utci: number;
    stress_category?: undefined;
};
/**
 * Maps a temperature to the stress category.
 * @param {number} val
 * @returns {string|number} Stress category label, or NaN for non-finite input.
 */
export function mapping(val: number): string | number;
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