/**
 * Sweetlink Next.js Plugin
 *
 * Zero-config integration for Next.js projects.
 * Wraps your Next.js config to automatically start the Sweetlink WebSocket server in dev mode.
 *
 * Usage:
 * ```javascript
 * // next.config.mjs
 * import { withSweetlink } from '@ytspar/sweetlink/next';
 *
 * const nextConfig = { ... };
 * export default withSweetlink(nextConfig);
 * ```
 *
 * Port detection (in order of precedence):
 * 1. process.argv: `--port 3002` or `-p 3002`
 * 2. process.env.PORT
 * 3. Default: 3000
 */
export interface WithSweetlinkOptions {
    /**
     * Override the app port detection. If not specified, auto-detected from
     * process.argv (--port / -p) or process.env.PORT, defaulting to 3000.
     */
    port?: number;
}
/**
 * Wrap a Next.js config to auto-start Sweetlink in development.
 *
 * Mirrors the Vite plugin (`@ytspar/sweetlink/vite`) pattern:
 * - Detects the app port from CLI args
 * - Starts the WebSocket server on `appPort + 6223`
 * - Registers graceful shutdown handlers
 * - No-ops in production
 */
export declare function withSweetlink<T>(nextConfig: T, options?: WithSweetlinkOptions): T;
export default withSweetlink;
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