.eslintrc.js

eslint configuring

module.exports = {
    "extends": "eslint:recommended",
    "rules": {
        // enable additional rules
        "indent": ["error", 4],
        "linebreak-style": ["error", "unix"],
        "quotes": ["error", "double"],
        "semi": ["error", "always"],

        // override default options for rules from base configurations
        "comma-dangle": ["error", "always"],
        "no-cond-assign": ["error", "always"],

        // disable rules from base configurations
        "no-console": ["error", {
            "allow": ["warn", "error", "info"]
        }]
    },
    "parser": "babel-eslint",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "script"
    },
    "globals": {
        "window": true
    },
    "env": {
        "node": true,
        "es6": true,
        "mocha": true
    }
}

babel.config.js

babel doc

1

npm install --save-dev @bable/core @babel/cli @bable/preset-env @bable/node

2

npm install --save @babel/polyfill

3 babel.config.js

4

const  presets= [
    [
      "@babel/env",
      {
        "targets": {
          "edge": "17",
          "firefox": "60",
          "chrome": "67",
          "safari": "11.1",
        },
        "useBuiltIns": "usage",
      }
    ]
];

module.exports={presets};

5

npx bable-node index.js

webpack.config.js

1. Webpack 5.0
2. Webpack 4.43

1

npm install webpack webpack-cli -D

2 webpack.config.js

3

const path= require('path');
module.exports = {
    mode:'development', //production development
    entry:'./src/index.js',
    output:{
        path: path.resolve(__dirname, "dist"),
        filename:'bundle.js'
    }
}

4 package.json

"script":{
    "build":"webpack",
    "dev":"webpack-dev-server"
}