import { CSSRule } from '../types.js';
export declare class CSSParser {
    /**
     * Parse CSS files and extract all rules
     */
    parseCSSFiles(cssFiles: string[]): Promise<CSSRule[]>;
    /**
     * Parse CSS content and extract rules
     */
    parseCSSContent(content: string, filePath: string): Promise<CSSRule[]>;
    /**
     * Extract selectors from a CSS rule node
     */
    private extractSelectors;
    /**
     * Extract properties from a CSS rule node
     */
    private extractProperties;
    /**
     * Parse rules inside @media queries
     */
    private parseMediaRules;
    /**
     * Parse rules inside @keyframes
     */
    private parseKeyframeRules;
    /**
     * Calculate the size of a CSS rule in bytes
     */
    private calculateRuleSize;
    /**
     * Extract all class names from CSS selectors
     */
    extractClassNames(rules: CSSRule[]): Set<string>;
    /**
     * Extract class names from a single CSS selector
     */
    private extractClassNamesFromSelector;
    /**
     * Extract all ID names from CSS selectors
     */
    extractIdNames(rules: CSSRule[]): Set<string>;
    /**
     * Extract ID names from a single CSS selector
     */
    private extractIdNamesFromSelector;
    /**
     * Check if a selector is a pseudo-class or pseudo-element
     */
    isPseudoSelector(selector: string): boolean;
    /**
     * Check if a selector contains attribute selectors
     */
    hasAttributeSelector(selector: string): boolean;
    /**
     * Normalize selector for comparison
     */
    normalizeSelector(selector: string): string;
}
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