import type { CustomSyntaxChecker } from '../types.js';
/**
 * Validates a MIME type string according to the WHATWG MIME Sniffing specification.
 *
 * Optionally restricts to MIME types with no parameters.
 *
 * @see https://mimesniff.spec.whatwg.org/#valid-mime-type
 */
export declare const checkMIMEType: CustomSyntaxChecker<{
    /**
     * @see https://mimesniff.spec.whatwg.org/#valid-mime-type-with-no-parameters
     */
    withoutParameters?: boolean;
}>;