Promise based webpack configs fail #1946

// webpack.config.js
module.exports = new Promise(r=>setTimeout(r, 100, {}));

//processOptions.js 
function processOptions(config, argv, callback) {
  // processOptions {Promise}
  if (typeof config.then === 'function') {
///ERROR HERE -- argv is not passed ///
    config.then(processOptions).catch((err) => {
      // eslint-disable-next-line no-console
      console.error(err.stack || err);
      // eslint-disable-next-line no-process-exit
      process.exit();
    });

    return;
  }

function processOptions(config, argv, callback) {
  // processOptions {Promise}
  if (typeof config.then === 'function') {
///Fixed by passing argv.
    config.then( c =>processOptions(c, argv, callback)).catch((err) => {
      // eslint-disable-next-line no-console
      console.error(err.stack || err);
      // eslint-disable-next-line no-process-exit
      process.exit();
    });

    return;
  }