/**
 * @param  {ConstructorParameters<typeof CssUsageDuplex>} options
 * @return {CssUsageDuplex}
 */
export default function index(options: {
    browsers: string;
    ignore?: import("../lib/stream/CssUsageDuplex.js").FeatureKeys[];
    skipErrors?: boolean;
}, filename?: string): CssUsageDuplex;
import CssUsageDuplex from '../lib/stream/CssUsageDuplex.js';
//# sourceMappingURL=stream.d.ts.map