vue scaffolding configuration es6 to es5

With the rapid development of front-end technology, ES6 has become one of the mainstream languages ​​​​for front-end development. However, in actual development, we still need to consider compatibility issues, because different browsers have different levels of support for ES6. To solve this problem, we need to convert ES6 code to ES5 code. This article will introduce how to configure the ES6 to ES5 tool in the Vue project.

1. Prerequisites

Before starting the configuration, you need to install the following software:

• Node.js
• npm

2. Installing Babel

Babel is a widely used JavaScript compiler that can convert ES6 code to ES5 code. Using Babel in a Vue project requires installing two dependencies:

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

• babel-core is the core module of Babel, which provides the function of converting code.
• babel-loader is the loader used by Webpack to handle Babel.

3. Configuring Babel

In the Vue project, Babel’s configuration file is .babelrc. We need to add conversion rules in this file:

{
  "presets": ["env"]
}

This code means that we use the env preset to convert the code. The env preset generates different conversion rules based on the target browser to convert ES6 code to ES5.

Since we have babel-preset-env installed by default, we do not need to install this preset again.

4. Configuring Webpack

In Vue projects, Webpack is the tool used to build and package code. We need to add Babel support in the Webpack configuration file.

Open webpack.base.conf.js and add the following rules in module.rules:

{
    test: /.js$/,
    exclude: /(node_modules|bower_components)/,
    use: {
        loader: 'babel-loader',
        options: {
            presets: ['env']
        }
    }
}

In this rule, we tell Webpack to use Babel transformation for all .js files, but exclude Remove the node_modules and bower_components folders. At the same time, we specified to use the env preset to convert the code. This rule will convert ES6 to ES5.

5. Test the conversion function

We can create an ES6 module to test the conversion function. For example, in the src folder, create a file named test.js containing the following code:

const greeting = "Hello";
const name = "World";
console.log(`${greeting}, ${name}!`);

Then, introduce this module in the main.js file:

import './test.js';

Finally, Run npm run dev and open the console to view the output. You can see that the output is:

Hello, World!

This proves that our code has been successfully converted to ES5.

6. Advanced configuration

If you want to configure Babel more flexibly and carefully, you can use the following method:

• In the .babelrc file Add other presets or plug-ins.
• Configure the options in the .babelrc file to control Babel's conversion behavior. For example, you can convert ES6 to ES5 loose mode by setting the loose option.
• Add additional rules in the webpack.base.conf.js file to handle more types of files. For example, if you have a Vue single-file component in your project, you can handle it by adding a vue-loader rule.

7. Conclusion

Configuring the ES6 to ES5 conversion tool in the Vue project can help us solve browser compatibility issues and allow us to write modernizations more easily JavaScript code. Use these configuration tips for Babel and Webpack to provide more powerful functionality and greater flexibility. We hope you can learn useful knowledge from this article to build better Vue projects.

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