/**
 * Type that converts a string literal type into a number type.
 * If the string represents a valid number, it returns that specific number type.
 * Otherwise, it returns `number`.
 *
 * @template S - The string type to be converted to a number type.
 */
type ConvertLiteral<S> = S extends `${infer N extends number}` ? N : number;
/**
 * Converts a string to a number if the string is a valid number.
 * Throws an error if the string is not a valid number format.
 *
 * @param {S} n - The string to convert to a number.
 * @returns {ConvertLiteral<S>} - The converted number (or the literal number if valid).
 * @throws {Error} - Throws an error if the string is not a valid number.
 *
 * @template S - The string type passed to the function.
 */
export declare const num: <S extends string>(n: S) => ConvertLiteral<S>;
export {};