How to use babel to convert code in Vue

With the continuous updating and iteration of Web front-end technology, the update speed of frameworks is gradually accelerating. As a very popular JavaScript front-end framework, Vue.js can only maintain its competitiveness in this industry by continuous learning and updating. In this article, we will discuss how to use Babel to convert Vue.js code into code that the browser can understand.

What is Babel?

Babel is a community-driven JavaScript compiler that converts new versions of JavaScript code into ES5 code to ensure the code can run smoothly in the browser.

For front-end developers, Babel plays a very important role. Because it can help us use the latest version of JavaScript language features without having to worry about browser compatibility issues.

Using Babel in Vue.js

Vue.js is a framework written in JavaScript that can help us quickly build responsive single-page web applications. In Vue.js, Babel's main role is to convert ES6 (JavaScript language specification for ECMAScript6 and above) code into ES5 code to ensure that it can run correctly in various browsers.

Specifically, to use Babel in Vue.js, we need to create a file named .babelrc in the root directory of the project. This file contains configuration information that instructs Babel how to convert code.

Now, let’s briefly introduce how to use Babel to convert Vue.js code.

1. Installing Babel

First, we need to install Babel in the project. Open the terminal and enter the following command:

npm install babel-core babel-loader babel-preset-env --save-dev

The above command will install the following modules:

1. babel-core: Babel’s core module.
2. babel-loader: The module required for Babel to integrate with the webpack packaging tool.
3. babel-preset-env: Module required to convert ES6 code to ES5 syntax.

After the installation is complete, create a .babelrc file in the root directory of the project.

2. Writing the .babelrc file

In the .babelrc file, we need to specify the version information of the JavaScript code to be converted, as well as the plug-ins and presets to be used. The following is an example of a basic .babelrc file:

{
  "presets": ["env"]
}

Here we only configure a presets attribute with the value env, indicating that we want to use Babel's env preset. The function of env preset is to perform intelligent conversion and determine which plug-ins to use to convert the code according to the configured environment.

Actually, the babel-preset-env module is automatically installed when we install Babel, so there is no need to install the module separately.

3. Configuring Babel in webpack

When packaging the Vue.js project with webpack, we need to add Babel configuration to the webpack configuration file. Open the webpack.config.js file and configure it as follows:

module.exports = {
  module: {
    rules: [{
      test: /.js$/,
      exclude: /node_modules/,
      use: {
        loader: 'babel-loader'
      }
    }]
  }
}

Here we define a Babel loader, which will load all files with a .js suffix and convert them through Babel .

At the same time, we noticed that we specified that the node_modules folder will not be converted in the exclude attribute. This is because the code in this folder is usually installed through npm and does not need to be converted.

Conclusion

In Vue.js, using Babel for code conversion allows your application to run on more browsers, while also enjoying the benefits brought by the new version of JavaScript. All features. With the above brief introduction, you have taken the first step towards application optimization.

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