/**
 * The supported file types that can be determined by the engine. Used in {@link tryDetermineFileTypeFromURL} and {@link tryDetermineFileTypeFromBinary}
 */
export declare type FileType = "gltf" | "glb" | "vrm" | "fbx" | "obj" | "usdz" | "usd" | "usda" | "unknown";
/**
 * Tries to determine the file type of a file from its URL
 * This method does perform a range request to the server to get the first few bytes of the file
 * If the file type can not be determined it will return "unknown"
 * @param url The URL of the file
 * @param useExtension If true the file type will be determined by the file extension first - if the file extension is not known it will then check the header
 * @example
 * ```typescript
 * const url = "https://example.com/model.glb";
 * const fileType = await tryDetermineFileTypeFromURL(url);
 * console.log(fileType); // "glb"
 */
export declare function tryDetermineFileTypeFromURL(url: string, useExtension?: boolean): Promise<FileType>;
/** Attempts to determine the file type of a binary file by looking at the first few bytes of the file.
 * @hidden
 */
export declare function tryDetermineFileTypeFromBinary(data: ArrayBuffer, response: Response): FileType;