/**
 * Formats multi-line output with line numbers, a left border,
 * a mismatch pointer, and smart truncation for large outputs.
 */
export declare function formatOutputLines(output: string, firstDiffLine?: number): string[];
/**
 * Formats error output with red text, a left border, and clean indents.
 */
export declare function formatErrorOutputLines(errorOutput: string): string[];
/**
 * Formats a memory size in bytes to a human-readable string (e.g. KiB, MiB).
 */
export declare function formatMemory(bytes: number | undefined): string;