const SassRuleRewire = require('react-app-rewire-sass-rule');
const { alias, configPaths } = require('react-app-rewire-alias');
const path = require('path');

module.exports = function override(config, env) {
  require('react-app-rewire-postcss')(config, {
    plugins: loader => [require('postcss-rtl')()]
  });

  // Tree Shaking 활성화
  config.optimization.usedExports = true;

  // 코드 스플리팅 설정
  config.optimization.splitChunks = {
    chunks: 'all'
  };

  config = new SassRuleRewire()
    .withRuleOptions({
      test: /\.s[ac]ss$/i,
      use: [
        {
          loader: 'sass-loader',
          options: {
            sassOptions: {
              includePaths: ['node_modules', 'src/assets']
            }
          }
        }
      ]
    })
    .rewire(config, env);

  // Alias
  config = alias(configPaths('./tsconfig.paths.json'))(config);

  return config;
};