Having trouble executing NestJS in production mode due to missing module

After implementing a generic class as shown below, an issue seems to have arisen:

    import { Logger } from '@nestjs/common';
    import { PaginationOptionsInterface, Pagination } from './paginate';
    import { Repository } from 'typeorm';

    export class EntityService<T> {
      private repository: Repository<T>;
      constructor(repository) {
        this.repository = repository;
      }

      async getEntityWithPagination(
        options: PaginationOptionsInterface,
      ): Promise<Pagination<T>> {
        const [results, total] = await this.repository.findAndCount({
          take: options.limit,
          skip: (options.page - 1) * options.limit,
        });
        return new Pagination<T>({ results, total });
      }
    }

I am also utilizing this class with other entity services, like so:

    @Injectable()
    export class CarService extends EntityService<CarEntity> {
      constructor(
        @InjectRepository(CarEntity)
        private carRepository: Repository<CarEntity>,
      ) {
        super(carRepository);
      }

The code functions correctly when running npm run start:dev, but it throws the following error when attempting to run in production using npm run start:prod:

        internal/modules/cjs/loader.js:582
            throw err;
            ^

        Error: Cannot find module 'src/shared/entity.service'
            at Function.Module._resolveFilename (internal/modules/cjs/loader.js:580:15)
            at Function.Module._load (internal/modules/cjs/loader.js:506:25)
            at Module.require (internal/modules/cjs/loader.js:636:17)
            at require (internal/modules/cjs/helpers.js:20:18)
            at Object.<anonymous> (/home/tejas/Code/web/project/dist/car/car.service.js:27:26)
            at Module._compile (internal/modules/cjs/loader.js:688:30)
            at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
            at Module.load (internal/modules/cjs/loader.js:598:32)
            at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
            at Function.Module._load (internal/modules/cjs/loader.js:529:3)
        npm ERR! code ELIFECYCLE
        npm ERR! errno 1
        npm ERR! <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e595978a8f808691a5d5cbd5cbd5">[email protected]</a> start:prod: `node dist/main.js`
        npm ERR! Exit status 1

Attempts to resolve the issue by deleting the dist folder and updating packages were unsuccessful. The package.json configuration is provided below. Help with debugging would be greatly appreciated.

        dependencies": {
            "@nestjs/common": "^5.5.0",
            "@nestjs/core": "^5.5.0",
            "@nestjs/jwt": "^0.2.1",
            "@nestjs/passport": "^5.1.0",
            "@nestjs/typeorm": "^5.2.2",
            "bcryptjs": "^2.4.3",
            "glob": "^7.1.3",
            "passport": "^0.4.0",
            "passport-http-bearer": "^1.0.1",
            "passport-jwt": "^4.0.0",
            "pg": "^7.7.1",
            "reflect-metadata": "^0.1.12",
            "rimraf": "^2.6.2",
            "rxjs": "^6.2.2",
            "typeorm": "^0.2.9",
            "typescript": "^3.2.2"
        },
        "devDependencies": {
            "@nestjs/testing": "^5.5.0",
            "@types/express": "^4.16.0",
            "@types/jest": "^23.3.1",
            "@types/node": "^10.12.18",
            "@types/supertest": "^2.0.7",
            "jest": "^23.5.0",
            "nodemon": "^1.18.9",
            "prettier": "^1.14.2",
            "supertest": "^3.1.0",
            "ts-jest": "^23.1.3",
            "ts-loader": "^4.4.2",
            "ts-node": "^7.0.1",
            "tsconfig-paths": "^3.5.0",
            "tslint": "5.11.0",
            "webpack": "^4.28.2",
            "webpack-cli": "^3.1.2",
            "webpack-node-externals": "^1.7.2"
        },
typescriptnestjs

Answer №1

The root cause has been identified - an absolute path was used while importing the class.

import { EntityService } from '../shared/service-common'; //this is the correct way

import { EntityService } from 'src/shared/service-common'; // this is the incorrect auto import

To address the auto import issue, I have made a configuration change in VS Code 

"typescript.preferences.importModuleSpecifier": "relative"

Answer №2

To start fresh, remove the dist directory and then execute: npm run start:dev

Answer №3

Make sure that the script you are using is directed to main.js within the dist folder.

"start:prod": "node dist/src/main"

Answer №4

A similar issue I encountered was related to a misalignment in file naming conventions, where the reference had capitalization that did not match the actual filename:

import { AnotherClass } from './another-class';

despite the file being named AnotherClass.ts

Correcting the import statement helped rectify the issue.

Answer №5

It's important to note that storing js/ts files (including imported modules) outside the src folder could lead to complications when executing start:prod

For example, I had a seed.ts file for populating my database using Prisma ORM. Once I relocated it into the src folder, the problem was resolved.

Answer №6

The Fix

To resolve this issue, simply delete the noEmit property from the compilerOptions section in the tsconfig.json file.

Answer №7

Occasionally, the issue may stem from preexisting code located outside of the SRC directory (such as Typeform migrations) that results in the compilation within DIST navigating through additional folder levels (e.g., dist/migrations, dist/src), preventing the main file from being in its intended location.

Answer №8

To fix the issue, I successfully resolved it by removing the automatically generated files and reconstructing them, specifically the dist folder.

Answer №9

In case your issue is not related to relative directory problems, you can attempt resolving it by deleting the dist folder and then running npm run start:prod once more. Additionally, if there is a file named tsconfig.build.tsbuildinfo, make sure to delete that as well.

Answer №10

It slipped my mind to include these essential packages for mikro-orm. Once I installed them, my problem was resolved:

yarn add @mikro-orm/core @mikro-orm/nestjs

Answer №11

My simple solution was to avoid using spaces in the folder names. For example, instead of writing "codes projects," I had to write it as "codes_projects" for it to be recognized properly. It may seem obvious, but sometimes the easiest solutions are overlooked.

Answer №12

This information may not apply to everyone, but in my particular situation, the issue was triggered by an instanceOf...

We had a function that took two different types of parameters

fetchElement(svc: TypeA | TypeB) {
  svc instanceof TypeA
}

I'm not sure why, but the problem was resolved once we removed this portion.

Answer №13

The issue is triggered by the use of capitalized file names.

Key-store.entity.ts -> key-store.entity.ts

To resolve this, ensure all filenames are in lowercase.

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