fastify-file-interceptor/fastify-file-interceptor/src/multer/utils/multer-utils.ts

This library for Nestjs using FastifyAdapter it rely on library fastify-multer and express multer

import {
  BadRequestException,
  HttpException,
  PayloadTooLargeException,
} from "@nestjs/common";
import { multerExceptions } from "./multer-constant";

export function transformException(error: Error | undefined) {
  if (!error || error instanceof HttpException) {
    return error;
  }
  switch (error.message) {
    case multerExceptions.LIMIT_FILE_SIZE:
      return new PayloadTooLargeException(error.message);
    case multerExceptions.LIMIT_FILE_COUNT:
    case multerExceptions.LIMIT_FIELD_KEY:
    case multerExceptions.LIMIT_FIELD_VALUE:
    case multerExceptions.LIMIT_FIELD_COUNT:
    case multerExceptions.LIMIT_UNEXPECTED_FILE:
    case multerExceptions.LIMIT_PART_COUNT:
      return new BadRequestException(error.message);
  }
  return error;
}