Function verifyAppExtension

lib/basedriver/helpers.js:115–122

(app, supportedAppExtensions)

}

function verifyAppExtension (app, supportedAppExtensions) {
  if (supportedAppExtensions.includes(path.extname(app))) {
    return app;
  }
  throw new Error(`New app path '${app}' did not have ` +
    `${util.pluralize('extension', supportedAppExtensions.length, false)}: ` +
    supportedAppExtensions);
}

async function configureApp (app, supportedAppExtensions) {
  if (!_.isString(app)) {