@nestia/core/src/decorators/internal/route_error.ts

Super-fast validation decorators of NestJS

import { HttpException } from "@nestjs/common";
import express from "express";
import type { FastifyRequest } from "fastify";
import { throwError } from "rxjs";

import { ExceptionManager } from "../../utils/ExceptionManager";

/** @internal */
export function route_error(
  request: express.Request | FastifyRequest,
  error: any,
) {
  error = (() => {
    // HTTP-ERROR
    if (error instanceof HttpException) return error;

    // CUSTOM-REGISTERED ERROR
    for (const [creator, closure] of ExceptionManager.tuples)
      if (error instanceof creator) return closure(error);

    // MAYBE INTERNAL ERROR
    return error;
  })();

  try {
    error.method = request.method;
    error.path =
      (request as express.Request).path ??
      (request as FastifyRequest).routeOptions?.url ??
      (request as any).routerPath;
  } catch {}

  setTimeout(() => {
    for (const listener of ExceptionManager.listeners) {
      try {
        const res: any | Promise<any> = listener(error);
        if (typeof res === "object" && typeof res.catch === "function")
          res.catch(() => {});
      } catch {}
    }
  }, 0);
  return throwError(() => error);
}