After transitioning from Laravel Mix Version 2 to Version 5, I encountered an error that needed addressing.

In the previous version of Laravel Mix, importing Vue components looked like this:

Vue.component(
    'example-component', 
    require('./components/ExampleComponent.vue')
);

However, in Laravel Mix Version 5, the process for importing components has changed:

import ExampleComponent from './components/ExampleComponent.vue';

Vue.component('example-component', ExampleComponent);

If you need guidance on this update, refer to the official documentation:

For enhanced performance, consider lazy loading your components with the following syntax:

Vue.component("ExampleComponent", () => import("./components/ExampleComponent"));

When referencing a component in the past, you may have used code like this:

Vue.component('dashboard', require('./components/Dashboard.vue'));

If encountering issues after updating to laravel mix 5.0 or other libraries, simply append .default as shown below:

Vue.component('dashboard', require('./components/Dashboard.vue').default);

This adjustment resolved the issue for me as well.

When working on my project, I encountered an issue with importing a component into the router. Initially, I had imported it like this:

import bsw from 'common-mod/src/components/webcommon/webcommon'

The problem was easily fixed by changing the import statement to:

import bsw from 'common-mod/src/components/webcommon/webcommon.vue'

In case someone else is encountering the same error repeatedly, consider adding an additional div in your component template.

As documented:

Component template must have exactly one root element

Take a look at this straightforward example:

 import YourCustomComponent from '{path to component}'
    export default {
        components: {
            YourCustomComponent
        },
}

 // Sub-component
 <template>
     <div> This should do it! </div>
 </template>

When encountering a similar issue, I initially utilized a default import:

import VueAutosuggest from 'vue-autosuggest';

However, the problem was resolved by using a named import instead:

import {VueAutosuggest} from 'vue-autosuggest';

Here's a possible solution to fix the problem:

Vue.component(
'another-component', 
require('./components/AnotherComponent.vue').default);

There's an issue that you need to address:

[Vue alert]: Component mount failure: template or rendering function not present.

This error is occurring due to a specific obstacle hindering the mounting of your component.

In my case, I encountered this error because my component file was not encoded properly.

I implemented this handy script in my Laravel app.js file to automatically include all components from the component folder.

const files = require.context('./', true, /\.vue$/i)
files.keys().map(key => Vue.component(key.split('/').pop().split('.')[0], files(key)))

To ensure it functions correctly, just add 'default' as shown below:

const files = require.context('./', true, /\.vue$/i)
files.keys().map(key => Vue.component(key.split('/').pop().split('.')[0], files(key).default))

Running into the same issue, I found that none of the previously suggested solutions resolved it for me.

In my scenario, the component structure in a file named my-component.js was as follows:

Vue.component('my-component', {
    data() {
        return {
            ...
        }
    },
    props: {
        ...
    },
    template:`
        <div>
            ...
        </div>
    `
});

To use this component in another file, I imported it following this pattern:

import MyComponent from '{path-to-folder}/my-component';

Vue.component('parent_component', {
    components: {
        MyComponent
    }
});

The strange behavior was that while it functioned well in some instances, it failed to do so within the "parent_component". To rectify this, I stored the component in a variable within the file itself and exported it as default.

const MyComponent = Vue.component('my-component', {
    data() {
        return {
            ...
        }
    },
    props: {
        ...
    },
    template:`
        <div>
            ...
        </div>
    `
});

export default MyComponent;

This resolution may appear straightforward, but considering its success in one particular component without these adjustments, I initially struggled to comprehend the necessity. Nevertheless, implementing this method ensured consistent functionality across all components.

Ensure that when importing files with the .vue extension, you include it explicitly like this:

import myComponent from './my/component/my-component.vue';

If you forget to add the .vue and there is a file with the same name but with a .ts extension in the directory, for instance, if you are separating javascript/typescript from the template and linking it within my-component.vue:

<script lang="ts" src="./my-component.ts"></script>

... then the import will default to the .ts file, resulting in no template or render function being defined because the .vue template was not imported.

By specifying .vue in the import statement, the correct template will be located immediately.

Make sure to include the <template> tag in your HTML code.

It's unbelievable how I managed to resolve the problem! Such a strange solution!
I decided to leave the application running, then I went ahead and deleted all template tags before eventually restoring them which miraculously fixed everything! Still puzzled about what exactly happened.

While working with Typescript and vue-property-decorator, I faced an issue where my IDE suggested "MyComponent.vue.js" instead of "MyComponent.vue", leading to an error in my code.

This experience reminded me that when encountering such errors in single-file component setups, it's essential to double-check your imports in the router configuration.

When working with storybook and typescript, I found it necessary to include the following code:

.storybook/webpack.config.js

const path = require('path');

module.exports = async ({ config, mode }) => {

    config.module.rules.push({
        test: /\.ts$/,
        exclude: /node_modules/,
        use: [
            {
                loader: 'ts-loader',
                options: {
                    appendTsSuffixTo: [/\.vue$/],
                    transpileOnly: true
                },
            }
        ],
    });

    return config;
};

The reason behind this error was an incorrect import statement

Instead of:

components: {
  MyComp: import('./MyComp.vue'),
}

Correct it to:

components: {
  MyComp: () => import('./MyComp.vue'),
}

One common cause of the frustrating error message is a syntax issue within the import statement. For instance, in my experience, I encountered this problem due to an incorrect path specified in the import statement. Instead of

import DataTable from '@/components/data-table/DataTable';

I should have used

import DataTable from '@/components/data-table/';

It's essential to ensure that the import syntax aligns with your project setup and configuration to avoid encountering this error.

I encountered a similar issue previously where I neglected to wrap the component content within the template element.

Initially, my code looked like this:

import Vue from 'vue';
import VueRouter from 'vue-router';
import Home from './com/Home.vue';

Vue.use(VueRouter);

Vue.router = new VueRouter({
    mode: 'history',
    routes: [
        {
            path: '/',
            name: 'home',
            component: Home
        },
    ]
});

Within the Home.vue file, I had:

<h1>Hello Vue</h1>

As a result, I received the following error message:

Failed to mount component: template or render function not defined.

found in

---> <Home> at resources/js/com/Home.vue
       <Root>

The error was resolved by encapsulating the content in the template element:

<template>
   <h1>Hello Vue</h1>
</template>

Here's another suggestion to add to the mix... In my situation, the error was caused by a component without a template and with a custom render() function. I was puzzled why it wasn't working until I realized that I forgot to include <script>...</script> tags around the code in the component (even though I didn't have any template or style tags either). It's interesting how the compiler overlooked this issue...?

Regardless, always remember to use your <script> tags ;)

Encountered a similar problem in my app.ts script where I made the following modification:

import { createApp } from 'react'
import App from './App.vue'
- const newApp = createApp({App}).mount('#app')
+ const newApp = createApp(App).mount('#app')

<template><div></div></template>

When I encountered this issue, my child component was actually empty! I had mistakenly imported it into the parent component without any content in the template, script, or style sections (the child.vue file was completely blank). To resolve this, I simply added the template above to my child component and now everything is working as expected.

It was a learning opportunity during my time with Laravel where I encountered an error.

//require('./bootstrap');
window.axios = require('axios');
window.axios.defaults.headers.common['X-Requested-With'] = 'XMLHttpRequest';

window.Vue = require('vue');
import Vue from 'vue'

Vue.component('dictionary-index',  () => import('./components/DictionaryIndex.vue'));

Vue.component('dictionary-create',  () => import('./components/DictionaryCreate.vue'));

Vue.component('dictionary-cat',  () => import('./components/DictionaryCategory.vue'));

const app = new Vue({
    el: '#app',
});

To resolve the issue, I deleted the node_modules folder and then executed both npm install and npm run dev commands once more.

When integrating CDN Vue into your project, ensure that you correctly position the JS files of your components within your HTML document. For instance (in your HTML file):

<script src="yourComponent.js"></script>