webpack.dev.js

const webpack = require('webpack');
const merge = require('webpack-merge');
const CopyWebpackPlugin = require('copy-webpack-plugin');

const common = require('./webpack.common.js');

const ManifestPlugin = new CopyWebpackPlugin([
  { from: 'src/assets/manifest.dev.json', to: 'manifest.json' }
]);

module.exports = merge(common, {
  mode: 'development',
  devtool: 'inline-source-map',
  devServer: {
    host: '127.0.0.1',
    port: 8080,
    historyApiFallback: true,
    watchOptions: { aggregateTimeout: 300, poll: 1000 },
    disableHostCheck: true,
    headers: {
      "Access-Control-Allow-Origin": "*",
      "Access-Control-Allow-Methods": "GET, POST, PUT, DELETE, PATCH, OPTIONS",
      "Access-Control-Allow-Headers": "X-Requested-With, content-type, Authorization",
    }
  },
  plugins: [
    ManifestPlugin,
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('development')
    })
  ]
});