declare function cleanDir(dir: string): void;

declare function copyRecursiveSync(src: string, dest: string): void;

declare function mkdir(dest: string): void;

/**
 * Usage:
 * const start = performance.now()
 * <YOUR CODE>
 * printElapsed(start, "Build complete")
 */
declare function printElapsed(start: number, msg: string): void;

declare type BytesReturn = [string, Error | null];
/**
 * randomBytes generates a string of random bytes of a specified length
 */
declare function randomBytes(length: number): Promise<BytesReturn>;

declare function rimraf(entryPath: string): void;

export { cleanDir, copyRecursiveSync, mkdir, printElapsed, randomBytes, rimraf };