/**
 * Check if a file exists
 */
export declare function fileExists(filePath: string): boolean;
/**
 * Read file content safely
 */
export declare function readFile(filePath: string): string | null;
/**
 * Write file content safely
 */
export declare function writeFile(filePath: string, content: string): boolean;
/**
 * Get file size in bytes
 */
export declare function getFileSize(filePath: string): number;
/**
 * Format bytes to human readable format
 */
export declare function formatBytes(bytes: number): string;
/**
 * Format duration in milliseconds to human readable format
 */
export declare function formatDuration(ms: number): string;
/**
 * Normalize file path for cross-platform compatibility
 */
export declare function normalizePath(filePath: string): string;
/**
 * Get relative path from base directory
 */
export declare function getRelativePath(filePath: string, baseDir: string): string;
/**
 * Check if path is a directory
 */
export declare function isDirectory(dirPath: string): boolean;
/**
 * Get all files in directory recursively
 */
export declare function getFilesRecursively(dir: string, extensions?: string[]): string[];
/**
 * Debounce function
 */
export declare function debounce<T extends (...args: any[]) => any>(func: T, wait: number): (...args: Parameters<T>) => void;
/**
 * Create a progress reporter
 */
export declare class ProgressReporter {
    private current;
    private total;
    private startTime;
    constructor(total: number);
    update(current: number): void;
    increment(): void;
    finish(): void;
    private render;
}
/**
 * Simple logger with different levels
 */
export declare class Logger {
    private static level;
    static setLevel(level: 'debug' | 'info' | 'warn' | 'error'): void;
    static debug(message: string, ...args: any[]): void;
    static info(message: string, ...args: any[]): void;
    static warn(message: string, ...args: any[]): void;
    static error(message: string, ...args: any[]): void;
    private static shouldLog;
}
/**
 * Validate CSS selector
 */
export declare function isValidCSSSelector(selector: string): boolean;
/**
 * Extract class names from a CSS selector
 */
export declare function extractClassNames(selector: string): string[];
/**
 * Extract ID names from a CSS selector
 */
export declare function extractIdNames(selector: string): string[];
/**
 * Check if selector contains pseudo-classes or pseudo-elements
 */
export declare function hasPseudoSelectors(selector: string): boolean;
/**
 * Check if selector contains attribute selectors
 */
export declare function hasAttributeSelectors(selector: string): boolean;
/**
 * Normalize CSS selector for comparison
 */
export declare function normalizeSelector(selector: string): string;
/**
 * Calculate string similarity (Levenshtein distance)
 */
export declare function calculateSimilarity(str1: string, str2: string): number;
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