Can't run app after upgrading Quasar

Describe the bug Upgraded Quasar from 1.9.13 to 1.12.5. Quasar compiles, but once the app runs in the browser it immediately throws this cryptic error:

vue.runtime.esm.js?5593:5106 Uncaught TypeError: Cannot read property 'install' of undefined
    at Function.Vue.use (vue.runtime.esm.js?5593:5106)
    at eval (import-quasar.js?76de:24)
    at Object../.quasar/import-quasar.js (app.js:962)
    at __webpack_require__ (app.js:849)
    at fn (app.js:151)
    at eval (app.js?cb94:18)
    at Object../.quasar/app.js (app.js:938)
    at __webpack_require__ (app.js:849)
    at fn (app.js:151)
    at eval (client-entry.js?e881:21)

In import-quasar.js this seems to throw the error:

_vue.default.use(_quasar.Quasar, {
  config: {},
  lang: _enUs.default,
  iconSet: _materialIcons.default
});

And then Vue (vue.runtime.esm.js) throws this error:

function initUse (Vue) {
  Vue.use = function (plugin) {
    var installedPlugins = (this._installedPlugins || (this._installedPlugins = []));
    if (installedPlugins.indexOf(plugin) > -1) {
      return this
    }

    // additional parameters
    var args = toArray(arguments, 1);
    args.unshift(this);
 ->>   if (typeof plugin.install === 'function') {
      plugin.install.apply(plugin, args);
    } else if (typeof plugin === 'function') {
      plugin.apply(null, args);
    }
    installedPlugins.push(plugin);
    return this
  };
}

Node: v10.18.1, but tried different versions - no change Browsers: all browsers

Any hints what could be going on?

[dietrichg]

I cannot for the life of me get this to work:

  presets: [
    '@quasar/babel-preset-app'
  ],
  plugins: [
    "@babel/plugin-transform-arrow-functions",
    "@babel/plugin-transform-modules-commonjs"
  ]
}


// It works fine in all browsers if I remove the plugins, however I need these plugins for IE11 Support. 

[rstoenescu]

Glad everything’s working for you now. Also, please make that you remove the workboxOptions > exclude above when you upgrade to q/app v2.