Source Maps not working with Webpack

Question

I'm pretty new to webpack and having some trouble configuring it to produce the necessary source maps. In the devtools it says

Source Map detected

but it shows the bundle and not the original code:

Here is my webpack.config.js:

module.exports = {
  entry: [
    'webpack-dev-server/client?http://localhost:8080/',
    'webpack/hot/dev-server',
    "./src/index.js"
  ],
  output: {
    filename: 'bundle.js',
    path: '/',
  },
  debug: true,
  devtool: 'source-map',
  resolve: {
    extensions: ['', '.jsx', '.scss', '.js', '.json']
  },
  module: {
    loaders: [
      {
        test: /(\.js|\.jsx)$/,
        exclude: /node_modules/,
        loaders: ['react-hot','babel']
      },
      {
        test: /\.scss$/,
        exclude: /node_modules/,
        loaders: ["style", "css?sourceMap", "sass?sourceMap"]
      }
    ]
  },
  devServer: { hot: true },
  plugins: [ new webpack.HotModuleReplacementPlugin() ],
  inline: true,
  progress: true,
  colors: true
};

And here is my package.json:

{
  "name": "react-template",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "dev:test": "./node_modules/.bin/webpack --config webpack.test.config.js",
    "test:bundle": "./node_modules/.bin/tape test/bundle.js",
    "dev:serve": "./node_modules/.bin/webpack-dev-server --config webpack.development.config.js"
  },
  "devDependencies": {
    "babel-loader": "^6.2.1",
    "babel-preset-es2015": "^6.3.13",
    "babel-preset-react": "^6.3.13",
    "babel-preset-stage-0": "^6.3.13",
    "css-loader": "^0.23.1",
    "node-sass": "^3.8.0",
    "on-build-webpack": "^0.1.0",
    "react": "^0.14.6",
    "react-dom": "^0.14.6",
    "react-hot-loader": "^1.3.0",
    "sass-loader": "^3.2.1",
    "style-loader": "^0.13.0",
    "tape": "^4.4.0",
    "webpack": "^1.12.12",
    "webpack-dev-server": "^1.14.1"
  }
}

I've tried multiple variations of the devtool option and read this, this and this but no luck.

Any help would be great!

Answer 1

Please add in you webpack.config.js file the following`

devtool: "#inline-source-map",

You can find clear information about it from the site of webpack` https://webpack.github.io/docs/configuration.html

Also please find attached screenshot of sourcemap part, from webpack site.

Answer 2

In bundle.js you will see original transpiled webpack bundle - this is normal behaviour.

Open webpack:// and you will see your project files.

Answer 3

Make sure you have --mode development in your npm build script,

{
 "name": "test",
 "version": "1.0.1",
 "description": "",
 "scripts": {
 "build": "webpack",
  "start": "webpack-dev-server --mode development --open"
   "test": "echo \"Error: no test specified\" && exit 1",
 },
  "author": "",
  "license": "",
  "devDependencies": {
  "babel-core": "^6.26.3",
  "babel-loader": "^7.1.5",
  "babel-preset-env": "^1.7.0",
  "webpack": "^4.19.1",
  "webpack-cli": "^3.1.0",
  "webpack-dev-server": "^3.1.8"
  },
  "dependencies": {}
 }

webpack.config.js

const path = require('path');
var webpack = require('webpack');

module.exports = {
    entry: './src/web.js',
    devtool: 'inline-source-map',
    output: {
        filename: 'main.js',
        path: path.resolve(__dirname, 'dist')
    },
    mode: 'development',
    module: {
        rules: [{
            test: /\.js$/,
            exclude: /(node_modules)/,
            use: {
                loader: "babel-loader",
                options: {
                    presets: ["babel-preset-env"]
                }
            }
        }]
    },
    devServer: {
        inline: true,
        contentBase: path.join(__dirname, 'dist'),
        compress: true,
        port: 9000,
        watchOptions: {
            index: 'index.html',
            open: true,
            poll: true,
            watchContentBase: true
        }
    },
    watch: true,
    watchOptions: {
        aggregateTimeout: 500,
        ignored: /node_modules/,
        poll: 3000
    }
}