[Nest.js]hot reload

공식문서

1. 패키지 설치

npm i --save-dev webpack-node-externals run-script-webpack-plugin webpack

2. 구성파일 생성

// webpack-hmr.config.js
const nodeExternals = require('webpack-node-externals');
const { RunScriptWebpackPlugin } = require('run-script-webpack-plugin');

module.exports = function (options, webpack) {
  return {
    ...options,
    entry: ['webpack/hot/poll?100', options.entry],
    externals: [
      nodeExternals({
        allowlist: ['webpack/hot/poll?100'],
      }),
    ],
    plugins: [
      ...options.plugins,
      new webpack.HotModuleReplacementPlugin(),
      new webpack.WatchIgnorePlugin({
        paths: [/\.js$/, /\.d\.ts$/],
      }),
      new RunScriptWebpackPlugin({ name: options.output.filename, autoRestart: false }),
    ],
  };
};

3. main.ts 에 설정추가

// main.ts
declare const module: any;

async function bootstrap() {
  const app = await NestFactory.create(AppModule);
  await app.listen(3000);

  if (module.hot) {
    module.hot.accept();
    module.hot.dispose(() => app.close());
  }
}
bootstrap();

4. scripts 설정

"start:dev": "nest build --webpack --webpackPath webpack-hmr.config.js --watch"