/**
 * MIME type utilities for media format detection and conversion.
 *
 * Provides bidirectional mapping between media formats and MIME types.
 */
export declare const IMAGE_FORMATS: readonly ["png", "jpg", "jpeg", "gif", "webp"];
export type ImageFormat = (typeof IMAGE_FORMATS)[number];
export type VideoFormat = 'mkv' | 'mov' | 'mp4' | 'webm' | 'flv' | 'mpeg' | 'mpg' | 'wmv' | '3gp';
export type DocumentFormat = 'pdf' | 'csv' | 'doc' | 'docx' | 'xls' | 'xlsx' | 'html' | 'txt' | 'md' | 'json' | 'xml';
export type MediaFormat = DocumentFormat | ImageFormat | VideoFormat;
/**
 * Convert a media format to its MIME type.
 *
 * @param format - Media format (e.g., 'png', 'pdf')
 * @returns MIME type string or undefined if not a known format
 */
export declare function toMimeType(format: string): string | undefined;
/**
 * Convert a MIME type to its canonical media format.
 *
 * @param mimeType - MIME type string (e.g., 'image/png', 'application/pdf')
 * @returns Media format or undefined if not a known MIME type
 */
export declare function toMediaFormat(mimeType: string): MediaFormat | undefined;
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