import { Context } from '@web/dev-server-core';
import { GeneratedFile, PolyfillsConfig } from '@web/polyfills-loader';
export interface ReturnValue {
    htmlPath: string;
    indexHTML: string;
    inlineScripts: GeneratedFile[];
    polyfills: GeneratedFile[];
}
/**
 * transforms index.html, extracting any modules and import maps and adds them back
 * with the appropriate polyfills, shims and a script loader so that they can be loaded
 * at the right time
 */
export declare function injectPolyfillsLoader(context: Context, polyfills?: boolean | PolyfillsConfig): Promise<ReturnValue>;
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