/**
 * Dev / Node server assets: /@nexus_js/runtime ESM mirror + aggregated scoped CSS from .nx files.
 */
export declare function bustAggregatedStylesCache(): void;
export declare function bustGlobalStylesCache(): void;
export declare function getGlobalCssETag(): string | null;
export declare function buildGlobalStylesheet(appRoot: string, customEntry?: string): Promise<string | null>;
/**
 * Return the ETag for the most-recently compiled aggregated stylesheet, or
 * null when no compiled result is available yet.  Called by the request
 * handler to implement conditional-GET / 304 responses.
 */
export declare function getAggregatedCssETag(): string | null;
/**
 * Locate `@nexus_js/runtime/dist` without `require.resolve` (pnpm "exports" blocks package.json / bare resolve from apps).
 */
export declare function resolveRuntimeDistDir(appRoot: string): string | null;
/**
 * Locate `@nexus_js/serialize/dist` — served to the browser at `/_nexus/rt/serialize.js`.
 */
export declare function resolveSerializeDistFile(appRoot: string): string | null;
/** Safe basename-only files under runtime dist (no ..). Allows .js and .map (source maps). */
export declare function runtimeModulePath(runtimeDist: string, pathname: string): string | null;
/**
 * Concatenate scoped CSS from every .nx under src/ (routes + components).
 *
 * Concurrent callers share a single in-flight build promise so a burst of
 * requests after `bustAggregatedStylesCache()` does not launch N parallel
 * compile sweeps.  A generation counter prevents a stale in-flight build from
 * overwriting a cache that was reset while the build was running.
 */
export declare function buildAggregatedNxStylesheet(appRoot: string, cssEntry?: string): Promise<string>;
/**
 * Compiles a .nx file's client island bundle for dynamic import() during hydration.
 */
export declare function compileIslandClientBundle(appRoot: string, url: URL): Promise<{
    body: string;
    status: number;
}>;
export declare function isIslandClientRequest(pathname: string): boolean;
/**
 * Serves `$lib/…` files for client islands.
 *
 * Candidate order for JS files (first match wins):
 *   1. `.nexus/output/lib/`  — minified static files written by `nexus build` (production)
 *   2. `.nexus/lib/`         — plain-transpiled output of `compileLib` (build fallback)
 *   3. `src/lib/`            — TypeScript source (dev, served with tsx/strip-types)
 *
 * Source maps (`.js.map`): served exclusively from `.nexus/output/lib/` — they
 * are only generated by the production build step and have no dev equivalent.
 *
 * Returns null when the path doesn't match `/_nexus/lib/`.
 */
export declare function tryServeLibAsset(pathname: string, appRoot: string, _dev?: boolean): Promise<{
    body: Buffer;
    contentType: string;
} | null>;
export declare function tryServeRuntimeAsset(pathname: string, appRoot: string): Promise<{
    body: Buffer;
    contentType: string;
} | null>;
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