/**
 * Safely convert a number value into number union type.
 * @param n number value
 * @param u tuple containing all the values in a number union
 * @returns value of type union
 * @note Outputs error to console if incoming number is not part of number union!
 */
export declare function numberToUnion<U extends ReadonlyArray<number>>(n: number, u: U): (typeof u)[number];
/**
 * Convert a number value into number union type.
 * @param n number value
 * @param u tuple containing all the values in a number union
 * @returns value of type union or undefined if income number is not part of union
 * @note Outputs error to console if incoming number is not part of number union!
 */
export declare function numberToUnionStrict<U extends ReadonlyArray<number>>(n: number, u: U): (typeof u)[number] | undefined;