/**
 * Adds execute permissions to a file
 *
 * @param file - The file to add execute permissions to
 */
export declare function chmodXSync(file: string): void;
/**
 * Adds execute permissions to a file
 *
 * @param file - The file to add execute permissions to
 */
export declare function chmodX(file: string): Promise<void>;
/**
 * Checks the write permission of a file
 *
 * @param filename - The file to check the permission of
 * @returns A promise that resolves to true if the file is writable, false otherwise
 */
export declare function isWritable(filename: string): Promise<boolean>;
/**
 * Checks the write permission of a file
 *
 * @param filename - The file to check the permission of
 * @returns True if the file is writable, false otherwise
 */
export declare function isWritableSync(filename: string): boolean;
/**
 * Checks the execute permission of a file
 *
 * @param filename - The file to check the permission of
 * @returns A promise that resolves to true if the file is executable, false otherwise
 */
export declare function isExecutable(filename: string): Promise<boolean>;
/**
 * Checks the execute permission of a file
 *
 * @param filename - The file to check the permission of
 * @returns True if the file is executable, false otherwise
 */
export declare function isExecutableSync(filename: string): boolean;