/**
 * Updates the package.json file with new packages and scripts.
 *
 * @param {Object} params - The parameters for updating the package.json file.
 * @param {JSON} params.fileContent - The current content of the package.json file.
 * @param {Record<string, string>} params.newPackages - An object where the keys are the names of the new packages and the values are the versions.
 * @param {Record<string, string>} params.newScripts - An object where the keys are the names of the new scripts and the values are the script commands.
 *
 * @returns {string} The updated content of the package.json file.
 */
export declare const updatePackageJsonFile: ({ fileContent, newPackages, newScripts }: {
    fileContent: {
        scripts: Record<string, string>;
        dependencies: Record<string, string>;
    };
    newPackages: Record<string, string>;
    newScripts: Record<string, string>;
}) => string;