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.

Answer 2

The real answer

The issue is conflict with nest version.. anyone who see this - just make sure all your nestJs packages are of version 7 or 8 - don't mix them. especially those:

• @nestjs/common
• @nestjs/core
• @nestjs/typeorm

from here: https://github.com/nestjs/nest/issues/7468#issuecomment-876174870