Error encountered while trying to load component: template or render function is not defined

I have set up a basic vue.js configuration using browserify and vueify.

Following advice from previous tutorials, I included aliasify as a dependency to utilize the template engine. Below is my package.json file:


{
  "name": "simple-vueify-setup",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "dev": "budo index.js:build.js --open --live"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "vue": "^2.1.3"
  },
  "devDependencies": {
    "aliasify": "^2.1.0",
    "browserify": "^13.1.1",
    "budo": "^9.2.2",
    "vueify": "^9.3.0"
  },
  "browserify": {
    "transform": [
      "vueify",
      "aliasify"
    ]
  },
  "aliasify": {
    "aliases": {
      "vue": "vue/dist/vue.common.js"
    }
  }
}

With a simple view-model setup like this, I can see the engine in action:

// index.js
var Vue = require("vue");

new Vue({
  el: '#mountpoint',
  data: {
    message: 'Hello Vue!'
  }
});

This is the structure of the HTML document:

<!DOCTYPE html>
<html>
  <head>
    <title>Sample vueify</title>
  </head>
  <bod>
    <div id="mountpoint">
      {{message}}
    </div>
    <script type="text/javascript" src="build.js"></script>
  </bod>
</html>

However, when attempting to use a .vue file and a render function, it doesn't work as expected:

// app.vue
<style>
  .red {
    color: #f00;
  }
</style>

<template>
  <h1 class="red">{{msg}}</h1>
</template>

<script>
export default {
  data () {
    return {
      msg: 'Hello world!'
    }
  }
}
</script>

Here's the updated index.js file:

var Vue = require("vue");
var App = require("./app.vue");

new Vue({
  el: '#mountpoint',
  render: function (createElement) {
    return createElement(App)
  }
});

Upon running this code, I encounter the following error:

Parsing file /home/sombriks/git/simple-vueify-setup/app.vue: 'import' and 'export' may only appear at the top level (15:0)

If you have any insights or solutions to this issue, I would greatly appreciate your help.

You can access the complete sample code here.

Answer №1

For a solution, consider installing several babel packages:

npm install babel-core babel-preset-es2015 babelify --save-dev`

Modify your browserify configuration to include:

"browserify": {
  "transform": [
    "vueify",
    "babelify",
    "aliasify"
  ]
},

Ensure that you have a .babelrc file in the root of your project (same directory as package.json). This file should contain:

{
  "presets": ["es2015"]
}

While I have not tested with aliasify, this setup should function correctly without it.

If you prefer a simpler alternative to setting up your own environment, take a look at: https://github.com/vuejs/vue-cli The browserify advanced set up includes vueify and facilitates ES6 compilation.

Answer №2

Without any apparent reason, I found that the .vue component started working when I made the following changes:

// app.vue
<style>
  .red {
    color: #f00;
  }
</style>

<template>
  <h1 class="red">{{msg}}</h1>
</template>

<script>
module.exports = {
  data: () => {
    return {
      msg: 'Hello world!'
    }
  }
}
</script>

While this workaround resolved my issue temporarily, I am still puzzled as to why it occurred in the first place. Most sources advocate using the contemporary syntax for the script section of the .vue template.

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