import type { IHmrManager } from '../../../types/public-types.js';
/**
 * Returns whether a response is HTML and therefore eligible for development HMR
 * runtime injection.
 */
export declare function isHtmlResponse(response: Response): boolean;
/**
 * Returns whether HTML responses should receive the HMR runtime bootstrap.
 *
 * This is shared because filesystem page responses and adapter-level HTML
 * responses flow through different layers, but both need identical injection
 * behavior in watch mode.
 */
export declare function shouldInjectHmrHtmlResponse(watch: boolean, hmrManager?: Pick<IHmrManager, 'isEnabled'>, hostOwnsDevClient?: boolean): boolean;
/**
 * Injects the development HMR runtime script into an HTML response if it is not
 * already present.
 *
 * The check is intentionally idempotent because an HTML response can pass
 * through more than one development-layer wrapper before reaching the client.
 */
export declare function injectHmrRuntimeIntoHtmlResponse(response: Response): Promise<Response>;