/**
 * Verifies that the given val is a valid HTTP token per the rules defined in RFC 7230.
 * See {@link https://tools.ietf.org/html/rfc7230#section-3.2.6}
 *
 * @param val - The value to check.
 * @returns True if the value is a valid HTTP token, false otherwise.
 */
export declare function checkIsHttpToken(val: any): boolean;
/**
 * Hides internal Node.js stack frames for a given function.
 *
 * @param fn - The function to hide stack frames for.
 * @returns The function with hidden stack frames.
 */
export declare function hideStackFrames(fn: Function): Function;
export declare const validateHeaderName: Function;
export declare const validateHeaderValue: Function;
/**
 * Validates if the given value is a string.
 *
 * @param value - The value to validate.
 * @param name - The name of the argument being validated.
 * @throws {@link TypeError} If the value is not a string.
 */
export declare function validateString(value: any, name?: string): void;