Encountering the "Component resolution failed" error in Vue 3 when using global components

When I declare my Vue components in the top level HTML file, everything works fine. Here is an example:

<body>
  <div class='app' id='app'>        
    <header-bar id='headerBar'></header-bar>        
    <journal-page></journal-page>
  </div>
  <script src="js/app.js"></script>
</body>

However, if I try to use a <journal-card> component inside the <journal-page> component, I get this error message:

[Vue warn]: Failed to resolve component: journal-card at <JournalPage>.

How can I resolve this issue?

Below is the code from my main script file that loads the Vue components, app.js:

import * as _vue from 'vue';
import _headerBar from './widgets/headerBar.vue';
import _journalCard from './widgets/journalCard.vue';
import _journalPage from './widgets/journalPage.vue';
import _store from './data/store.js';

const app = _vue.createApp
({
    components: 
    {
        'headerBar': _headerBar,
        'journalCard': _journalCard,
        'journalPage': _journalPage     
    },
    data : _store,
    methods: {}
});
const mountedApp = app.mount('#app');

Here's the content of my journal-page.vue container:

<template>  
  <ul>
    <journal-card v-for="item in journal" :key="item.id" :entry=item></journal-card>
  </ul>
</template>

<script lang="js">
import _store from '../data/store.js';
export default {
  data: _store
};
</script>

And here is the journal-card.vue component:

<template>
  <div>
    This is a journal entry
  </div>
</template>

<script lang="js">
export default {
  data: null,
  props: [ 'entry' ]
};
</script>

Answer №1

When you register components in the root component's components option, it does not automatically make them global. Instead, they are only available to the root component itself and not its children.

If you want to make components globally accessible, you need to use the app.component function in your top-level code:

index.js

import { createApp } from 'vue';
import App from './App.vue';
import MyGlobalComponent from './components/MyGlobalComponent.vue';

const app = createApp(App);
app.component('MyGlobalComponent', MyGlobalComponent); ✅
const mountedApp = app.mount('#app');

Answer №2

In my experience, the mistake was declaring components in an array:

components: [ActiveUser, UserData]

instead of declaring them in an object:

components: {ActiveUser, UserData}

Answer №3

My experience was slightly different in this situation. I encountered an issue when attempting to display a Vue component with multiple words in a Laravel blade file.

If you are referencing a Vue component in a file that is not a .Vue file (such as HTML or Laravel Blade), make sure to use kebab-case format for the component name. For example, my-global-component

For more information, check out the Vue documentation at: https://vuejs.org/guide/essentials/component-basics.html#dom-template-parsing-caveats

Answer №4

It's worth mentioning that this page may appear in search engine results for those experiencing issues with the "Vue 3 Failed to resolve component" error. With the transition to Vue 3 and Quasar 2, some features have been deprecated, such as q-side-link which has quietly disappeared (see previous documentation).

According to a comment:

QSideLink is no longer necessary! Simply use a QItem or any other component you prefer and bind an @click="$router.push(...)" to it.

Although this may not be directly related to your current issue, it could potentially help others facing similar challenges. Therefore, I hope this information benefits at least one person who comes across this comment :-)

Answer №5

Always remember to place the mounting code last

app.mount('#app')    
app.component('list-view', ListView2)
                

If you do it the other way around, like this:

app.component('list-view', ListView2)
app.mount('#app')   

It won't work as expected.

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