I am a beginner with VueJs and this is my first App:
import { BootstrapVue } from 'bootstrap-vue'
import { createApp } from 'vue'
import App from './App.vue'
const myApp = createApp(App)
myApp.use(BootstrapVue)
myApp.mount('#app')
And when I save, nothing appears in my browser and it show this message in the Command:
warning in ./src/main.js
"export 'default' (imported as 'Vue') was not found in 'vue'
Bootstrap-Vue does not yet support Vue 3.
So if you want to use Bootstrap-Vue you will have to stick with Vue 2 for now.
In general, most of the libraries don't support Vue 3 yet, so I would suggest waiting a bit longer before using it until the ecosystem has caught up.
Explanation
The reason this is happening is because in Vue 2, Vue provides a default export export default vue, which allows BootstrapVue to use import Vue from 'vue'.
However, in Vue 3 this has changed, and Vue does no longer provide a default export, and instead uses named exports. So when BootstrapVue uses the following line import Vue from 'vue', the error occurs.
import * as Vue from 'vue'
this works for me
I was getting the warning
"export 'default' (imported as 'Vue') was not found in 'vue'
I'm using Vue 3 but the code I'm studying is Vue 2.
My code Vue 2 in main.js
import Vue from 'vue'
import App from './App.vue'
Vue.config.productionTip = false
new Vue ({
render: h => h(App),
}).$mount('#app')
So I needed to create a Vue instance with the following code Vue 2:
export const eventBus = new Vue ()
Then I received the error code, which I resolved by correcting the code that looked like this:
import { createApp } from 'vue'
import App from './App.vue'
export const eventBus = createApp(App)
createApp(App).mount('#app')
hi i am using laravel 9 mix and vue 3 here is my code app.js
// app.js
require('./bootstrap');
import { createApp } from 'vue'
import test from './components/Test.vue';
createApp({
components: { test }
}).mount('#app')
webpack.mix.js
const mix = require('laravel-mix');
mix.js('resources/js/app.js', 'public/js').vue();
in my case, I use webpack and vue2.
I use vue-loader to handle .vue file . I found I installed vue-loader v17 which requires vue3, so I uninstall it and npm i vue-loader#15
On Vue 3 applications you have to use the following connection Vuex store
store.js
import { createStore } from "vuex";
import axios from "axios";
export default createStore({
state: {
},
mutations: {
},
actions: {
}
})
main.js
import store from '#/store';
...
app.use(store);
In my case, this looks like it was caused by some sort of corrupt node module somewhere. I solved the problem by running
rm -rf node_modules/
In my project root directory. This deletes your node_modules folder. Then I reran
yarn install
or
npm install
and the problem was fixed. Hope this helps someone else. Also, many have noted the differences between vue 3 and vue 2 dependencies, I'm not sure those are still relevant in 2022.
In my case it was the wrong resolve.alias directive in webpack.config.js, which set 'vue' to 'vue/dist/vue.js' instead of 'vue/dist/vue.esm.js';
If you're using Vuex, running:
npm remove vuex
npm i vuex#3
should fix this problem.
None of the current responses fixed the issue for me though mine was a little different; I control the component that was failing and I know it was made with Vue3.
In case someone hits this issue but with a component they control, it COULD be that you removed the setup attribute from your components <script> tag.
So changing
<script lang="ts">
to
<script setup lang="ts">
fixed it for me
const Vue = require('vue')
const AppImport = Vue.createApp("dev-axios");
import axios from 'axios';
import VueAxios from 'vue-axios';
AppImport.use(VueAxios,axios);
If you're just after the styles you can simply put
import 'bootstrap/dist/css/bootstrap.css'
import 'bootstrap-vue/dist/bootstrap-vue.css'
into your app.js file and it will work without errors.
Related
I created a Vuejs project using vue create command provided after installing npm i #vue/cli. Now in my project I want to use this component. In it's installation guide it says:
"Then, import and register the component:"
import Vue from 'vue'
import vSelect from 'vue-select'
Vue.component('v-select', vSelect)
But where? None of my main.js files does not even include Vue from 'vue'
In vuejs3, you can use like this in main.js
import { createApp } from "vue";
import App from "./App.vue";
createApp(App).component('v-select', vSelect).mount("#app");
doc: https://v3.vuejs.org/guide/component-registration.html
How can I fix it? as the page not loading(showing a white page without anything else.)
WAIT Compiling...
98% after emitting CopyPlugin
WARNING Compiled with 4 warnings
warning in ./src/main.js
"export 'createApp' was not found in 'vue'
warning in ./src/router/index.js
"export 'createRouter' was not found in 'vue-router'
warning in ./src/store/index.js
"export 'createStore' was not found in 'vuex'
warning in ./src/router/index.js
"export 'createWebHistory' was not found in 'vue-router'
I just fixed another issue and now I got this. How can fix it please?
Those errors imply that you're trying to use the Vue 3 API (i.e., createApp), but you have vue#2.x installed (the vuejs2 tag is also a clue to that). Similarly, you're using Vue Router 4's API (i.e., createRouter), but you have vue-router#3.x installed.
Solution
You can either install the newest versions of the dependencies:
npm i -S vue#3 vue-router#4
Or you can use the older APIs. That is, switch from Vue 3 / Vue Router 4 code:
// main.js
import { createApp } from 'vue'
import router from './router'
createApp(App).use(router).mount('#app')
// router.js
import { createRouter } from 'vue-router'
export default createRouter(/*...*/)
...to Vue 2 / Vue Router 3 code:
// main.js
import Vue from 'vue'
import router from './router'
new Vue({
router,
render: h => h(App),
}).$mount('#app')
// router.js
import Vue from 'vue'
import VueRouter from 'vue-router'
Vue.use(VueRouter)
export default new VueRouter(/*...*/)
here's my code in main.js
import { createApp } from 'vue'
import vuetify from './plugins/vuetify'
import App from './App.vue'
const app = createApp(App)
app.use(vuetify)
app.mount('#app')
and here's my code in vuetify.js
import Vue from 'vue'
import Vuetify from 'vuetify/lib'
Vue.use(Vuetify)
export default new Vuetify({
icons: {
iconfont: 'mdi'
}
})
here's the error message I received
You are using Vue 3 (Vue CLI version doesn't matter much) and Vuetify 2.x is not compatible with Vue 3 - see the docs
So you need to make a choice - if you want to use Vuetify 2.x, you need to switch to Vue 2. If you want to continue to work with Vue 3, you need to use Vuetify 3 which is currently in aplha stage
I recently upgraded to vue3 using vue-next and when I run yarn serve I get some warnings.
import Vue from 'vue';
causes this warning "export" 'Vue' was not found in 'vue'.
import { createApp, h } from 'vue' works fine!
package.json
{
...
"dependencies": {
...,
"vue": "^3.0.0-beta.1"
}
}
Similar threads:
"export 'default' (imported as 'Vue') was not found in 'vue'
export 'default' (imported as Vue ) was not found in 'vue'
Have you tried:
if (process.client) {
import Vue from 'vue'
}
For more clarification
https://nuxtjs.org/faq/window-document-undefined
try importing with this.
if (process.client) {
import vue from 'vue'
}
You say you've recently upgraded to Vue 3. The import Vue from 'vue' syntax is no longer supported, since Vue has been restructured to support tree-shaking.
Instead of trying to use Vue.function, simply import { function } from 'vue' and use it directly.
This is documented in the migration guide here: https://v3-migration.vuejs.org/breaking-changes/global-api-treeshaking.html#global-api-treeshaking
I'd recommend giving the rest of the migration guide (at least the breaking changes) a read-through as well. It's very handy.
I have created a new project using vue-cli 'vue init webpack-simple my-app' command. In that fresh installation copy, I'm trying to import vue-router in the App.vue component that was created by default. But it is giving me an error: 'Uncaught ReferenceError: Vue is not defined'. If I import the vue again in App.vue, then the app is working fine. But I already imported the vue in main.js, so why do I need to import it again in App.js? Is there any way I can use the imported vue from main.js? Here is my code:
main.js:
import Vue from 'vue'
import App from './App.vue'
new Vue({
el: '#app',
render: h => h(App)
})
App.vue:
<template>
<div id="app">
<router-view></router-view>
</div>
</template>
<script>
import Vue from 'vue'; //**why I need to import it again? I already imported it in main.js
import VueRouter from 'vue-router';
Vue.use(VueRouter);
import QuestionOne from './components/QuestionOneTemplate';
const routes = [
{ path: '/', name: 'QuestionOne', component: QuestionOne },
];
const router = new VueRouter({
routes
});
window.router = router;
export default {
router,
name: 'app',
data () {
return {
}
}
}
</script>
<style lang="scss">
</style>
Is there any way i can use the imported vue from main.js?
No, you need to import it in every file that uses Vue. The imports/requires are how things get hooked up. Rest assured, each import will be the same singleton instance.
You can get to the router from a Vue component's javascript using this.$router and this.$route without an import, or inside a template, using simply $router and $route
Not recommended, but you can assign Vue to a global in main.js, and use the global without importing.
main.js
import Vue from 'vue';
global.MyVue = Vue
App.vue
import VueRouter from 'vue-router';
MyVue.use(VueRouter);
Why
This is how ES6 links things up. Consider it wiring. If there were more than 1 Vue lib available, how would the linker know which to use? What if another library defined a variable or function called Vue? Perhaps a lib uses its own internal Vue for an event bus or other feature.
Other Thoughts
The explicit import also makes IDE autocompletion and syntax highlighting work better. Some IDEs can add the imports automatically, and that makes life easier.
did you try this ?
import Vue from 'vue'
import VueRouter from 'vue-router'
then use
Vue.use(VueRouter)
because the error message means you need to import vue first to use vue-router
You did the right thing and you don't have to worry about importing Vue in multiple files. When you are shipping your application and build it for production, you will have only one "Vue import". If you take a look at dist folder and your bundled .js files you will notice that Vue is imported only once.