TypeORM Entity in NESTJS - Cannot use import statement outside a module

问题

Started new project with 'nest new' command. Works fine until I add entity file to it.

Got following error:

import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';

^^^^^^

SyntaxError: Cannot use import statement outside a module

What do I miss?

Adding Entity to Module:

import { Module } from '@nestjs/common';
import { BooksController } from './books.controller';
import { BooksService } from './books.service';
import { BookEntity } from './book.entity';
import { TypeOrmModule } from '@nestjs/typeorm';

@Module({
  imports: [TypeOrmModule.forFeature([BookEntity])],
  controllers: [BooksController],
  providers: [BooksService],
})
export class BooksModule {}

app.module.ts:

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { TypeOrmModule } from '@nestjs/typeorm';
import { Connection } from 'typeorm';
import { BooksModule } from './books/books.module';

@Module({
  imports: [TypeOrmModule.forRoot()],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {}

回答1:

You need to have a something.module.ts for every section of your app. It works like Angular. This is setup with GraphQL resolvers and service. REST is a bit different with a controller. Each module will probably have an entity and if GraphQL, projects.schema.graphql.

projects.module.ts

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { ProjectsService } from './projects.service';
import { Projects } from './projects.entity';

import { ProjectsResolvers } from './projects.resolvers';

@Module({
  imports: [
    TypeOrmModule.forFeature([Projects])],
  providers: [
    ProjectsService,
    ProjectsResolvers
  ],

})

export class ProjectsModule {}

回答2:

My assumption is that you have a TypeormModule configuration with an entities property that looks like this:

entities: ['src/**/*.entity.{ts,js}']

or like

entities: ['../**/*.entity.{ts,js}']

The error you are getting is because you are attempting to import a ts file in a js context. So long as you aren't using webpack you can use this instead so that you get the correct files

entities: [join(__dirname, '**', '*.entity.{ts,js}`)]

where join is imported from the path module. Now __dirname will resolve to src or dist and then find the expected ts or js file respectively. let me know if there is still an issue going on.

EDIT 1/10/2020

The above assumes the configuration is done is a javascript compatible file (.js or in the TypeormModule.forRoot()passed parameters). If you are using anormconfig.json` instead, you should use

entities: ['dist/**/*.entity.js']

so that you are using the compiled js files and have no chance to use the ts files in your code.

回答3:

As Jay McDoniel explained in his answer, the problem seems to be the pattern matching of entity files in ormconfig.json file: Probably a typescript file (module) is imported from a javascript file (presumably a previously transpiled typescript file).

It should be sufficient to remove an existing ts glob pattern in the ormconfig.json, so that TypeORM will only load javascript files. The path to the entity files should be relative to the working directory where node is executed.

   "entities"   : [
      "dist/entity/**/*.js"
   ],
   "migrations" : [
      "dist/migration/**/*.js"
   ],
   "subscribers": [
      "dist/subscriber/**/*.js"
   ],

来源：https://stackoverflow.com/questions/59435293/typeorm-entity-in-nestjs-cannot-use-import-statement-outside-a-module

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nestjs

typeorm