/**
 * Processes CSS with PostCSS and Tailwind
 */
export declare function processCSS(css: string, from: string, tailwindConfig: boolean | {
    config?: string;
    postcssConfig?: string;
} | undefined, projectRoot: string): Promise<string>;
/**
 * Finds the project root by looking for node_modules or package.json
 * Note: This is a synchronous version. The async version is in build.ts
 */
export declare function findProjectRootSync(startPath: string): string;