How i can build webpack 5 for IE11

Question

i have a problem with webpack 5 and ie11 i try top build my code for ie11 with webpack he compile the code but in ie11 i have a error syntax in my bundle.js

error :

1 */
2 /******/ (() => { // webpackBootstrap
3 /******/  var __webpack_modules__ = ({
4   const path = require('path');

i have a error in line 2 => (() => it's error with syntaxe error

my webpack.config.js

module.exports = {
    entry: __dirname+"/wwwroot/source/app.js",
    mode : "development",
    output: {
        path: path.resolve(__dirname, 'wwwroot/dist'),
        filename:"bundle.js"
    },
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: [
                            ['@babel/preset-env', {
                                targets: {
                                    "ie": "11"
                                }
                            }]
                        ]
                    }
                }
            }
        ]
    },
}

and my package.json

{
  "name": "totallydays",
  "version": "1.0.0",
  "description": "clone airbnb projet fin d'année",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "webpack",
    "watch": "webpack --watch"
  },
  "author": "benoit vaisse",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.12.3",
    "@babel/preset-env": "^7.12.1",
    "babel-loader": "^8.2.1",
    "webpack": "^5.4.0",
    "webpack-cli": "^4.2.0"
  },
  "dependencies": {
    "bootstrap": "^4.5.3",
    "jquery": "^3.5.1",
    "popper.js": "^1.16.1"
  }
}

thanks for all

Answer 1

Add the following browserlist entry to your package.json

"browserslist": ["ie 11"]

and remove the targets entry from the @babel/preset-env configuration.

Then babel as well as webpack will use the same config source for their code output.

See also:

• https://babeljs.io/docs/en/babel-preset-env#browserslist-integration
• https://webpack.js.org/configuration/target/

Answer 2

Ok i find the probleme must add line target: ['web', 'es5'] in my config webpack

const path = require('path');

module.exports = {
    entry: __dirname + "/wwwroot/source/app.js",
    mode: "development",
    output: {
        path: path.resolve(__dirname, 'wwwroot/dist'),
        filename: "bundle.js"
    },
    target: ['web', 'es5'],
    module: {
        rules: [
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: [
                            ['@babel/preset-env', {
                                targets: {
                                    "ie": "11"
                                }
                            }]
                        ]
                    }
                }
            }
        ]
    },
}

see here : After build via Webpack 5 app stoped working on Internet Explorer (IE11)