"Vue is throwing an error because it cannot set the property '$offlineStorage' on an undefined object. How can this issue be resolved

While working on my vue ionic app, I integrated the plugin available at https://github.com/filrak/vue-offline. However, upon installing the plugin, an error was encountered:

vue-offline.js?bf4e:193 Uncaught TypeError: Cannot set property '$offlineStorage' of undefined
    at Object.install (vue-offline.js?bf4e:193)
    at Object.use (runtime-core.esm-bundler.js?5c40:2945)
    at eval (main.js?56d7:139)
    at Module../src/main.js (app.js:1308)
    at __webpack_require__ (app.js:854)
    at fn (app.js:151)
    at Object.1 (app.js:1644)
    at __webpack_require__ (app.js:854)
    at checkDeferredModules (app.js:46)
    at app.js:994

Upon investigation of the vue-offline.js file, it was identified that the issue stemmed from the following lines:

 if (pluginOptions.storage) Vue.prototype.$offlineStorage = VueOfflineStorage;
    if (pluginOptions.mixin) Vue.mixin(VueOfflineMixin);

The entire function in question looked like this:

var VueOfflinePlugin = {
  install: function install(Vue) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
      mixin: true,
      storage: true
    };
    var pluginOptions = {
      mixin: options.mixin,
      storage: options.storage
    };
    if (pluginOptions.storage) Vue.prototype.$offlineStorage = VueOfflineStorage;
    if (pluginOptions.mixin) Vue.mixin(VueOfflineMixin);
  }
};

Incorporating this in my main.js file:

const app = createApp(AppMain)
    .use(IonicVue)
    .use(router)
    .use(RouterPrefetch)
    .use(VueOffline)
    .use(store);

Unable to pinpoint what might be missing in this integration process. Any insights would be appreciated.

Answer №1

In the latest version 2.0.8 of vue-offline, it's mentioned that only Vue 2 is supported, whereas your Ionic app requires Vue 3.

A GitHub issue (vue-offline#24) has been raised to request support for Vue 3. You can contribute by commenting on that issue or even submitting a pull request yourself to upgrade the plugin (refer to the Vue 3 Migration Guide).

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