import { type Options } from 'sass';
export interface SassCompileOptions {
    minify?: boolean;
    postCss?: boolean;
    sassOptions?: Options<'sync'>;
}
/**
 * Compiles .scss files to .css files within a `rootDir` and outputs them to the `outputDir`.
 * @param {string[] | string} files An array of filenames, or a glob pattern to find files.
 * @param {string} rootDir The common root directory in which the input files live. This is used to build the structure within the output directory.
 * @param {string} outputDir The output directory where the .css files will be written to.
 */
export declare function compileSass(files: string[] | string, rootDir: string, outputDir: string, options?: SassCompileOptions): Promise<string[]>;
/**
 * Runs CSS transformers on the provided CSS content.
 * @param filename The CSS filename.
 * @param css The CSS content.
 */
export declare function runPostCss(filename: string, css: string): Promise<string>;
/**
 * Minifies CSS content.
 * @param css The CSS content.
 */
export declare function minifyCss(css: string): string;