/**
 * Class representing a URLValidator.
 *
 * It provides the ability to validate URLs based on a predefined list of allowed protocols.
 */
export declare class URLValidator {
    /**
     * Validates the provided URL.
     *
     * This method checks that the provided URL is a string and can be parsed.
     *
     * @param url - The URL to be validated. This parameter must be a valid string representation of a URL.
     *
     * @throws {URLParsingError} Thrown if the URL is not a string or can't be parsed.
     *
     * @example
     * // Example of validating a URL successfully
     * const validator = new URLValidator();
     *
     * const url = 'http://example.com';
     *
     * validator.validate(url); // Does not throw an error
     *
     * @example
     * // Example of a failing validation
     * const validator = new URLValidator();
     *
     * const url = 123;
     *
     * try {
     *   validator.validate(url);
     * } catch (error) {
     *   console.error(error); // URLParsingError
     * }
     */
    validate(url: unknown): void;
    /**
     * Checks if the URL string can be parsed.
     *
     * @param url - The URL string to be checked.
     *
     * @returns A boolean indicating whether the URL can be parsed.
     */
    private canParse;
}