Add guideline on how to use with nestjs

[lekhasy]

Nestjs is famous among nodejs API framework, it would be helpful to have a short section describe how to use this with nestjs. I tried to copy the code provided in readme but it does not work, I think other people might have the same experience.

FYI, this is what i have done:

• Follow Nestjs guide to create a new nestjs app.

• Follow readme.md in this repo to create all necessary files

• Throw an error in app.controller.ts: throw new NotFoundError({type: 'customer', id: '123' })

• add HttpProblemResponse to main.ts:

  
  import { NestFactory } from '@nestjs/core';
  import { AppModule } from './app.module';
  import { HttpProblemResponse } from 'express-http-problem-details';
  import { NotFoundErrorMapper } from './ErrorMapper';
  import { DefaultMappingStrategy, MapperRegistry } from 'http-problem-details-mapper'

async function bootstrap() { const app = await NestFactory.create(AppModule); const strategy = new DefaultMappingStrategy( new MapperRegistry() .registerMapper(new NotFoundErrorMapper())) app.use(HttpProblemResponse({ strategy })) await app.listen(3000); } bootstrap();

Expected result:

{ "status": 404, "title": "customer with id 123 could not be found.", "type": "http://tempuri.org/NotFoundError" }

Actual Result:

{ "statusCode": 500, "message": "Internal server error" }