/**
 * Prepares the Next.js application for rendering.
 *
 * @param {any} directories - The directories containing the Next.js application. Can be a string or an object with production and development properties.
 * @param {any} port - The port number to run the development server on. Defaults to PORT if not provided.
 * @throws {Error} If the renderer location is not defined.
 * @return {Promise<void>} A Promise that resolves when the Next.js application is prepared for rendering.
 */
export declare const prepareNext: (directories: any, port: any) => Promise<void>;
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