phoenix_preact-4.5-webpack.config.js

phoenix_preact-4.5-webpack.config.js

// ...

module.exports = (env, options) => {
  // ...

  return {
    // ...
    module: {
      rules: [
        {
          test: /\.jsx?$/,
          resolve: {
            extensions: ['.js', '.jsx']
          },
          exclude: /node_modules/,
          use: {
            loader: 'babel-loader'
          }
        },
        // ...
      ]
    },
    // ...
  }
};