import type { string_filename } from '../../../types/typeAliases';
import type { really_unknown } from '../../organization/really_unknown';
/**
 * Tests if given string is valid URL.
 *
 * Note: This does not check if the file exists only if the path is valid
 * @public exported from `@promptbook/utils`
 */
export declare function isValidFilePath(filename: really_unknown): filename is string_filename;