/**
 * Dev server detection, startup, and management for visual validation.
 * Detects dev commands from package.json and starts a local dev server
 * with automatic port detection and readiness polling.
 */
import { type ResultPromise } from 'execa';
export interface DevServerInfo {
    url: string;
    port: number;
    process: ResultPromise;
    kill: () => Promise<void>;
}
/**
 * Detect the dev command and likely port from package.json.
 */
export declare function detectDevCommand(cwd: string): {
    command: string;
    args: string[];
    port: number;
} | null;
/**
 * Start a dev server, wait for it to be ready, and return a handle.
 * Returns null if no dev command is detected or the server fails to start.
 */
export declare function startDevServer(cwd: string, timeoutMs?: number): Promise<DevServerInfo | null>;
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