在生产模式下运行nestjs时出错，找不到模块

Question

我实现了以下通用类，这可能会引起问题，

    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 });
      }
    }

并与其他实体服务一起使用，例如

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

该代码可以正常运行，npm run start:dev但是在尝试与生产一起运行时抛出以下错误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! project@0.0.0 start:prod: `node dist/main.js`
        npm ERR! Exit status 1

我曾尝试删除dist文件夹，但仍然没有运气。我也尝试过更新软件包，package.json如下。我不知道如何调试它。

        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"
        },

Answer 1

我发现了问题，这是由于导入类时的绝对路径。

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

import { EntityService } from 'src/shared/service-common'; // wrong autoimport

为了修复自动导入，我在VS Code中添加了此设置

"typescript.preferences.importModuleSpecifier": "relative"

Answer 2

删除 dist 目录，再次运行 npm run start:dev

Answer 3

当文件名是小写时，由于大写引用，我也看到了同样的问题：

import { SomeClass } from './Some.class'; 

但该文件被命名为some.class.ts

修复导入解决了该错误。

Answer 4

我认为值得一提的是，在 src 文件夹之外放置 js/ts 文件（导入模块）可能会在运行时导致问题start:prod

我有一个seed.ts，用于使用 Prisma ORM 播种到我的数据库，我将其移至 src 文件夹内并解决了问题。

Answer 5

只需确保您的脚本指向 dist 文件夹内的 main.js 即可。

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