import type { Plugin } from 'rollup';
import type { PostCSSPluginOptions } from './options';
/**
 * PostCSS Rollup plugin
 *
 * Processes CSS files through PostCSS and optional preprocessors (Sass, Less, Stylus).
 * Supports CSS injection into the DOM or extraction to separate files.
 */
export declare function postcss(pluginOptions?: PostCSSPluginOptions): Plugin;
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