pdf-reader-web/server/webpack.config.js

const path = require('path');
const nodeExternals = require('webpack-node-externals');
const webpack = require('webpack');

module.exports = {
  target: 'node',
  entry: './server/index',
  output: {
    path: path.resolve(__dirname, '../.next'),
    filename: 'server.bundle.js',
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV),
    }),
  ],
  externals: [nodeExternals()],
};