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[webpack start:hmr] SyntaxError: Unexpected token import on TypeORM entity files #1018

fedme opened this Issue Aug 29, 2018 · 5 comments


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fedme commented Aug 29, 2018

I'm submitting a...

[ ] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

When running npm run start:hmr (note that npm run webpack is running) on a project created with the CLI and containing a TypeORM entity file, I get the following error:

[Nest] 10906   - 2018-8-29 16:41:14   [TypeOrmModule] Unable to connect to the database. Retrying (6)... +3011ms
(function (exports, require, module, __filename, __dirname) { import { Entity, Column, PrimaryGeneratedColumn, VersionColumn, CreateDateColumn,
UpdateDateColumn } from 'typeorm';

SyntaxError: Unexpected token import

Expected behavior

I would expect no errors. It seems like the entity file does not get compiled to JavaScript.

Minimal reproduction of the problem with instructions

  1. Create a new project with the Nest CLI
  2. Add TypeORM to the project
  3. Create a TypeORM entity file
  4. Run npm run webpack
  5. On another terminal run npm run start:hmr
  6. Observe the error

What is the motivation / use case for changing the behavior?


[System Information]
OS Version     : Linux 4.4
NodeJS Version : v8.11.4
NPM Version    : 6.4.0
[Nest Information]
typeorm version : 5.2.0
common version  : 5.0.0
core version    : 5.0.0

I am new to Nest so please excuse me If I am making a stupid mistake.
I was not able to find details in the documentation about hot reloading on a CLI project. Thanks!


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fedme commented Aug 30, 2018

I was able to fix this issue by configuring TypeORM inside my app's root module (instead of using a ormconfig.json file) and referencing my entities by class instead of by file as suggested in #711 .

Is this the correct way / is there some other better solution? Thanks.
If there is, I really think the docs should have a section on webpack + typeorm. I would like to help but I am totally new to Nest :)

My root module now:

import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { RecordsModule } from './records/records.module';
import { Record } from './records/record.entity';

  imports: [
      keepConnectionAlive: true,
      type: 'postgres',
      host: 'localhost',
      port: 5432,
      username: '***',
      password: '***',
      database: '***',
      synchronize: true, // TODO: Remove in production!
      entities: [ // Passing entities as class references so that webpack doesn't break
      migrations: [__dirname + '/migration/**/*.ts'],
      subscribers: [__dirname + '/subscriber/**/*.ts'],
  controllers: [
  providers: [
export class AppModule {}

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whtiehack commented Aug 30, 2018

try change tsconfig.json -> compilerOptions -> target to es6 .


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fedme commented Aug 30, 2018

@whtiehack thanks but it was already set to es6.


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kamilmysliwiec commented Aug 31, 2018

The entities are loaded on the fly by the TypeOrm, and therefore, webpack doesn't that these paths should be treated differently than just plain literal strings. Your solution is the best available one so far.


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zhyupe commented Oct 14, 2018

Maybe a better workaround:

Write a loader like this and pass require('path/to/ormconfig.json') to TypeOrmModule.forRoot.

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