/**
 * Lightning CSS and Browserslist implementation of CSSOptimizationEngine.
 *
 * @module extensions/ext-css-lightning
 */
import "../_dnt.polyfills.js";
import type { ExtensionFactory } from "veryfront/extensions";
import { type CSSOptimizationEngine, type CSSOptimizationRequest, type CSSOptimizationResult } from "veryfront/extensions/css";
export interface LightningCSSOptimizationConfig {
    /** Browserslist expressions resolved once when the extension is created. */
    readonly browserQueries?: readonly string[];
}
/** Parser-backed CSS optimizer provided by this extension. */
export declare class LightningCSSOptimizationEngine implements CSSOptimizationEngine {
    #private;
    readonly cacheIdentity: string;
    constructor(config?: LightningCSSOptimizationConfig);
    optimize(request: CSSOptimizationRequest): CSSOptimizationResult;
}
declare const extCSSLightning: ExtensionFactory;
export default extCSSLightning;
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