/**
 * Figure out the mode app is setup.
 *
 * 1. src/client, src/server => lib
 * 2. src/{subapp-directories}, src/server => lib
 * 3. which react lib is being used (default react)
 *
 * And then setup the env APP_SRC_DIR so in dev mode code in src is executed
 * with run time compiler like @babel/register, but in prod mode transpiled
 * code in lib will be executed.
 *
 * @param {*} prodDir - directory to save data of the app mode
 * @param {*} reactLib - UI framework (react)
 *
 * @returns app mode data
 */
export declare function makeAppMode(prodDir?: string, reactLib?: string): any;