TypeError: rxjs_1.lastValueFrom is not a function

Question

I am building an api using nestjs. After adding the typeorm and pg dependencies and adding the TypeOrmModule.forRoot({}) code in app.module.ts like shown below.

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

@Module({
  imports: [CoffeesModule, TypeOrmModule.forRoot({
    type: 'postgres',
    host: 'localhost',
    port: 5432,
    username: 'postgres',
    password: 'xxx',
    database: 'postgres',
    autoLoadEntities: true,
    synchronize: true
  })],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule { }

I get an error TypeError: rxjs_1.lastValueFrom is not a function with but no error when I exclude TypeOrmModule.forRoot({}).

What could be the reason for the error ?

Answer 1

If you're using Nest v8, RxJS version 7 is used, which no longer has a toPromise() method for Observables, so Nest uses the lastValueFrom method instead. If you're receiving this error, you probably need to update your rxjs dependency to >7.

npm i rxjs@^7
yarn add rxjs@^7
pnpm i rxjs @^7

Pick your flavor of package manager and have at it.

In the last update of NestJS, when is used cli to initialization of project this error is throw.