/**
 * Common utility functions shared across the project
 */
export * from './logger';
export * from './validation';
/**
 * Escape XML special characters for safe SVG text rendering
 */
export declare function escapeXml(text: string): string;
/**
 * Adjust color brightness by a percentage
 * @param color - Color string (hex, rgb, rgba, hsl, hsla, or named color)
 * @param percent - Brightness adjustment percentage (-100 to 100)
 * @returns Adjusted color string (always returns hex format for consistency)
 */
export declare function adjustBrightness(color: string, percent: number): string;
/**
 * Wrap text to fit within specified constraints
 * @param text - Text to wrap
 * @param maxWidth - Maximum width in pixels
 * @param fontSize - Font size in pixels
 * @param maxLines - Maximum number of lines
 * @param fontFamily - Font family for width calculation (affects character width)
 * @returns Array of text lines
 */
export declare function wrapText(text: string, maxWidth: number, fontSize: number, maxLines: number, fontFamily?: 'inter' | 'default'): string[];
/**
 * Generate SVG gradient definition
 * @param id - Gradient ID for SVG reference
 * @param colors - Array of color stops
 * @param direction - Gradient direction (angle in degrees or keywords)
 * @returns SVG gradient definition string
 */
export declare function generateSvgGradient(id: string, colors: Array<{
    offset: string;
    color: string;
    opacity?: number;
}>, direction?: string | number): string;
/**
 * Create SVG text element with proper positioning and styling
 * @param content - Text content
 * @param x - X coordinate
 * @param y - Y coordinate
 * @param className - CSS class name
 * @param attributes - Additional SVG attributes
 * @returns SVG text element string
 */
export declare function createSvgText(content: string, x: number | string, y: number | string, className?: string, attributes?: Record<string, string | number>): string;
/**
 * Truncate text to specified length with ellipsis
 * @param text - Text to truncate
 * @param maxLength - Maximum length
 * @param ellipsis - Ellipsis string (default: '...')
 * @returns Truncated text
 */
export declare function truncateText(text: string, maxLength: number, ellipsis?: string): string;