How to use babel-loader file preprocessor

This time I will bring you how to use babel-loader file preprocessor, what are theprecautionswhen using babel-loader file preprocessor, the following is a practical case, let’s take a look .

What we are introduced to today is babel-loader, which is used to process ES6 syntax and compile it into js syntax that the browser can execute.

Installation

We need to use babel-loader babel-core babel-preset

Compatible version: webpack 3. x | babel-loader 8.x | babel 7.x

npm install babel-loader@8.0.0-beta.0 @babel/core @babel/preset-env webpack webpack 3.x babel-loader 7.x | babel 6.x

Use

Let’s start with a little chestnut:

var htmlWebpackPlugin = require('html-webpack-plugin') const path = require('path') module.exports = { mode: 'development', entry: './src/app.js', output: { filename: 'js/bundle.js', path: path.resolve(dirname, 'dist') }, module: { rules: [ { test: /\.js$/, exclude: /(node_modules|bower_components)/, // (不处理node_modules 和 bower_components下的js文件) 优化处理加快速度 use: { loader: 'babel-loader', options: { // options选项中的presets设置的就是当前js的版本 presets: ['@babel/preset-env'] } } } ] }, plugins: [ new htmlWebpackPlugin({ template: 'index.html', inject: 'body', filename: 'index.html' }) ] }

I believe you have mastered the method after reading the case in this article , for more exciting content, please pay attention to other related articles on the php Chinese website!

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