webpack.config.dev.js

const autoprefixer = require('autoprefixer');
const path = require('path');
const webpack = require('webpack');
const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
  devtool: 'cheap-module-source-map',
  entry: './src/index.js',
  output: {
    filename: 'react-google-oauth.js',
    path: path.resolve(__dirname, 'dist'),
    // include comments in bundles with information about the contained modules
    pathinfo: true,
    publicPath: '/',
    library: "react-google-oauth",
    libraryTarget: "umd"
  },
  module: {
    //makes missing exports an error instead of warning
    strictExportPresence: true,
    
    rules: [
      // First, run the linter.
      // It's important to do this before Babel processes the JS.
      {
        test: /\.(js|jsx)$/,
        enforce: 'pre',
        use: [
          {
            loader: require.resolve('eslint-loader'),
          },
        ],
        exclude: /node_modules/,
      },
      // ** ADDING/UPDATING LOADERS **
      // The "file" loader handles all assets unless explicitly excluded.
      // The `exclude` list *must* be updated with every change to loader extensions.
      // When adding a new loader, you must add its `test`
      // as a new entry in the `exclude` list for "file" loader.

      // "file" loader makes sure those assets get served by WebpackDevServer.
      // When you `import` an asset, you get its (virtual) filename.
      // In production, they would get copied to the `build` folder.
      {
        exclude: [
          /\.html$/,
          /\.(js|jsx)$/,
          /\.css$/,
          /\.json$/,
          /\.bmp$/,
          /\.gif$/,
          /\.jpe?g$/,
          /\.png$/,
        ],
        loader: require.resolve('file-loader'),
        options: {
          name: 'static/media/[name].[hash:8].[ext]',
        },
      },
      // Process JS with Babel.
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        loader: require.resolve('babel-loader'),
        options: {
          presets: ['env'],
          plugins: [require('babel-plugin-transform-object-rest-spread')],
          // This is a feature of `babel-loader` for webpack (not Babel itself).
          // It enables caching results in ./node_modules/.cache/babel-loader/
          // directory for faster rebuilds.
          cacheDirectory: true,
        },
      },
      {
        test: /\.css$/,
        use: [
          require.resolve('style-loader'),
          {
            loader: require.resolve('css-loader'),
            options: {
              importLoaders: 1,
              modules: false,
              localIdentName: "[name]__[local]___[hash:base64:5]"
            },
          },
          // "postcss" loader applies autoprefixer to our CSS.
          // "css" loader resolves paths in CSS and adds assets as dependencies.
          // "style" loader turns CSS into JS modules that inject <style> tags.
          // In production, we use a plugin to extract that CSS to a file, but
          // in development "style" loader enables hot editing of CSS.
          {
            loader: require.resolve('postcss-loader'),
            options: {
              // Necessary for external CSS imports to work
              // https://github.com/facebookincubator/create-react-app/issues/2677
              ident: 'postcss',
              plugins: () => [
                require('postcss-flexbugs-fixes'),
                autoprefixer({
                  browsers: [
                    '>1%',
                    'last 4 versions',
                    'Firefox ESR',
                    'not ie < 9', // React doesn't support IE8 anyway
                  ],
                  flexbox: 'no-2009',
                }),
              ],
            },
          },
        ],
      }
    ],
  },
  plugins: [
    new CleanWebpackPlugin(['dist']),
    // Add module names to factory functions so they appear in browser profiler on dev env.
    new webpack.NamedModulesPlugin(),
    // This is necessary to emit hot updates (currently CSS only):
    new webpack.HotModuleReplacementPlugin(),
    // Watcher doesn't work well if you mistype casing in a path so we use
    // a plugin that prints an error when you attempt to do this.
    new CaseSensitivePathsPlugin(),
  ],
  resolve: {
    extensions: ['.js','.jsx'],
  },
  performance: {
    hints: false,
  }
};