Avoiding EADDRINUSE with HMR

[laino]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

When using the default HMR example EADDRINUSE errors can occur, likely because close() is not awaited.

Maybe the example should look something like this instead:

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';

async function bootstrap() {
    if (module.hot?.data?.closePromise) {
        await module.hot.data.closePromise;
        module.hot.data.closePromise = null;
    }

    const app = await NestFactory.create(AppModule, {
        forceCloseConnections: !!module.hot,
    });

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

    await app.listen(3000);
}

bootstrap();

Minimum reproduction code

https://docs.nestjs.com/recipes/hot-reload

In which operating systems have you tested?

• macOS
• Windows
• Linux

[micalevisk]

would you like to open a PR at https://github.com/nestjs/docs.nestjs.com

[laino]

Thanks for the pointer. I'll do so once I'm reasonably sure that this fixed the sporadic EADDRINUSE I've been getting.