import type { AnyCaller } from "./function.js";
/** List of file types in `extension: mime` format. */
export type FileTypes = {
    [extension: string]: string;
};
/** Get the file extension from a file path, or return `undefined` if the input has no extension. */
export declare function getFileExtension(file: string): string | undefined;
/** Get the file extension from a file path, or throw `RequiredError` if the input has no extension. */
export declare function requireFileExtension(file: string, caller?: AnyCaller): string;