/**
 * Gets the mime type from the given buffer.
 */
export declare function getMimeTypeFromBuffer(file: ArrayBuffer, fallback?: string): string | undefined;
/**
 * Gets the mime type from the given blob.
 */
export declare function getMimeTypeFromBlob(blob: Blob): string;
/**
 * Gets a file extension from the given mime type
 */
export declare function getExtensionFromMimeType(type: string): string | never;