Webpack dev server throws error - Refused to execute script because its MIME type ('text/html') is not executable

Question

I use Webpack bundler and Webpack dev server for local development. The front-end is in React.js+Redux and the back-end in Node.js and koajs.

In back-end, I use passportjs library for user authentication and other libraries koa-passport, passport-facebook, passport-google-auth for authentication through Facebook or Google. Basically, I implemented koa-passport-example.

If my application wants to redirect user to Facebook or Google login page, Webpack dev server throws error:

GET http://localhost:8090/auth/bundle.js net::ERR_ABORTED

Refused to execute script from 'http://localhost:8090/auth/bundle.js' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.

If I generate bundle by Webpack and host it on Node.js server, I don't get this error. I need to find out how to set up Webpack dev server to get rid of this error message.

package.json

    "scripts": {
    "debug": "./node_modules/nodemon/bin/nodemon.js --inspect ./script/server.js",
    "webpack": "npm run serve | npm run dev",
    "start": "node ./script/server.js",
    "serve": "./node_modules/.bin/http-server -p 8080",
    "dev": "webpack-dev-server -d --progress --colors --port 8090 --hot --inline",
  },
        "dependencies": {
        "@koa/cors": "^2.2.1",
        "actions": "^1.3.0",
        "aws-s3-form": "^0.3.5",
        "aws-sdk": "^2.165.0",
        "axios": "^0.16.2",
        "bootstrap": "^3.3.7",
        "bootstrap-timepicker": "github:janzenz/bootstrap-timepicker#feature/compatibility-es6",
        "d3-ease": "^1.0.3",
        "d3-selection": "^1.1.0",
        "d3-shape": "^1.2.0",
        "d3-transition": "^1.1.0",
        "font-awesome": "^4.7.0",
        "http-server": "^0.10.0",
        "immutable": "^3.8.2",
        "jquery": "^3.2.1",
        "jquery-ui": "^1.12.1",
        "jquery.panzoom": "^3.2.2",
        "jsonwebtoken": "^8.1.0",
        "juration": "^0.1.0",
        "knex": "^0.14.2",
        "koa": "^2.3.0",
        "koa-body": "^2.5.0",
        "koa-bodyparser": "^4.2.0",
        "koa-logger": "^3.1.0",
        "koa-passport": "^4.0.1",
        "koa-ratelimit": "^4.0.0",
        "koa-router": "^7.2.1",
        "koa-send": "^4.1.1",
        "koa-session": "^5.5.1",
        "koa-static": "^4.0.2",
        "moment": "^2.18.1",
        "objection": "^0.9.2",
        "oembed-auto": "0.0.3",
        "passport": "^0.4.0",
        "passport-facebook": "^2.1.1",
        "passport-google-oauth": "^1.0.0",
        "passport-jwt": "^3.0.1",
        "pg": "^7.4.0",
        "probe-image-size": "^3.1.0",
        "puppeteer": "^0.12.0",
        "react": "^15.6.1",
        "react-dom": "^15.6.1",
        "react-dropzone": "^4.2.1",
        "react-facebook-login": "^3.6.2",
        "react-google-login": "^3.0.2",
        "react-modal": "^3.1.2",
        "react-redux": "^5.0.6",
        "react-router": "^4.2.0",
        "react-router-dom": "^4.2.2",
        "react-router-redux": "^4.0.8",
        "react-share": "^1.17.0",
        "react-transition-group": "^1.2.1",
        "react-twitter-widgets": "^1.7.1",
        "redux": "^3.7.2",
        "redux-thunk": "^2.2.0",
        "request": "^2.83.0",
        "request-promise-native": "^1.0.5",
        "select2": "^4.0.4",
        "select2-bootstrap-theme": "0.1.0-beta.10",
        "shave": "^2.1.3",
        "sqlite3": "^3.1.13",
        "sugar-date": "^2.0.4",
        "svg-url-loader": "^2.3.0",
        "twitter": "^1.7.1",
        "twitter-widgets": "^1.0.0",
        "unfluff": "^1.1.0"
      },
      "devDependencies": {
        "autoprefixer": "^7.1.4",
        "babel": "^6.23.0",
        "babel-core": "^6.26.0",
        "babel-loader": "^7.1.2",
        "babel-preset-es2015": "^6.24.1",
        "babel-preset-react": "^6.24.1",
        "css-loader": "^0.28.7",
        "duplicate-package-checker-webpack-plugin": "^2.0.2",
        "eslint": "^4.7.2",
        "eslint-config-airbnb": "^15.1.0",
        "eslint-plugin-import": "^2.7.0",
        "eslint-plugin-jsx-a11y": "^5.1.1",
        "eslint-plugin-react": "^7.4.0",
        "favicons-webpack-plugin": "0.0.7",
        "file-loader": "^0.11.2",
        "friendly-errors-webpack-plugin": "^1.6.1",
        "html-webpack-plugin": "^2.30.1",
        "less": "^2.7.2",
        "less-loader": "^4.0.5",
        "node-sass": "^4.5.3",
        "nodemon": "^1.12.1",
        "npm-install-webpack-plugin": "^4.0.5",
        "postcss": "^6.0.11",
        "postcss-loader": "^2.0.6",
        "sass-loader": "^6.0.6",
        "style-loader": "^0.18.2",
        "url-loader": "^0.5.9",
        "webpack": "^3.6.0",
        "webpack-dev-server": "^2.9.1",
        "webpack-merge": "^4.1.0",
        "webpack-notifier": "^1.5.0"
      }

webpack.config.js

const webpack = require('webpack');
const webpackMerge = require('webpack-merge');
const path = require('path');
const WebpackNotifierPlugin = require('webpack-notifier');
const autoprefixer = require('autoprefixer');

const TARGET = process.env.npm_lifecycle_event;
console.log(`target event is ${TARGET}`);

let outputFileName = 'app';
outputFileName += TARGET === 'prod' ? '.min.js' : '.js';

const common = {
  entry: {
    app: './index.jsx',
  },
  module: {
    rules: [
      {
        test: /\.js[x]?$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader?presets[]=es2015&presets[]=react',
        },
      },
      {
        test: /\.scss$/,
        loaders: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.less$/,
        loaders: ['style-loader', 'css-loader', 'less-loader'],
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.(eot|ttf|svg|gif|png|jpg|otf|woff|woff2)$/,
        loader: 'url-loader',
      },
    ],
  },
  plugins: [
    new webpack.ProvidePlugin({
      jQuery: 'jquery',
      $: 'jquery',
      jquery: 'jquery',
      'window.jQuery': 'jquery',
    }),
    new webpack.LoaderOptionsPlugin({
      options: {
        postcss: [
          autoprefixer({
            browsers: ['last 3 versions'],
          }),
        ],
      },
    }),
    new WebpackNotifierPlugin(),
  ],
};

if (TARGET === 'dev' || !TARGET) {
  module.exports = webpackMerge(common, {
    devtool: 'eval-source-map',
    output: {
      filename: 'bundle.js',
      sourceMapFilename: '[file].map',
    },
    devServer: {
      contentBase: path.resolve(__dirname), // New
      historyApiFallback: true,
    },
  });
}

login.jsx

...
    <a href="/auth/facebook" className="btn btn--secondary ut-font-decima">Login</a>
...

server.js

const Koa = require('koa');
const Router = require('koa-router');
const logger = require('koa-logger');
const cors = require('@koa/cors');
const bodyParser = require('koa-bodyparser');
const serve = require('koa-static');
const path = require('path');
const session = require('koa-session');

const app = new Koa();
// trust proxy
app.proxy = true;

const router = new Router();

// sessions
app.keys = ['your-session-secret'];
app.use(session({}, app));

app.use(logger());
app.use(cors());
app.use(bodyParser());

require('./controllers/auth');
const passport = require('koa-passport');

app.use(passport.initialize());
app.use(passport.session());

app.use(serve(path.join(process.env.PWD, '/dist')));

router
  .get('/auth/facebook', passport.authenticate('facebook'))
  .get(
    '/auth/facebook/callback',
    passport.authenticate('facebook', {
      successRedirect: '/podcast',
      failureRedirect: '/',
    }),
  );

app.use(router.routes()).use(router.allowedMethods());

// don't listen to this port if the app is required from a test script
if (!module.parent) {
  app.listen(process.env.PORT || 1337);
  console.log('app listen on port: 1337');
}

Answer 1

i had a similar issue and thought i'd post my solution incase anyone had the same. basically, i was trying to refresh my app on a dynamic subroute, localhost:3000/route/dynamicRoute, and it was throwing a similar error to what's mentioned in the question. i solved my issue by adding publicPath: '/' to my output settings in my webpack config. the following is my webpack.config.js for reference.

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

const outputDirectory = 'dist';

module.exports = {
 entry: ['babel-polyfill', './src/client/index.js'],
 output: {
  path: path.join(__dirname, outputDirectory),
  filename: 'bundle.js',
  publicPath: '/'
 },
 module: {
  rules: [
   {
    test: /\.js$/,
    exclude: /node_modules/,
    use: {
     loader: 'babel-loader'
    }
  },
  {
   test: /\.css$/,
   use: ['style-loader', 'css-loader']
  },
  {
   test: /\.(pdf|jpg|png|gif|svg|ico)$/,
    use: [
     {
      loader: 'url-loader'
     },
    ]
   }
 ]
},
devServer: {
  port: 3000,
  open: true,
  proxy: {
   '/api': 'http://localhost:8080'
  },
  historyApiFallback: true,
  contentBase: './public/index.html',
  hot: true
 },
 plugins: [
  new CleanWebpackPlugin([outputDirectory]),
  new HtmlWebpackPlugin({
   template: './public/index.html',
   favicon: './public/favicon.ico'
  })
 ]
};