How to use config service within app.module.ts

I have the following folder structure (as given in the getting started section of the readme)

/src
├── app.module.ts
├── config
│   ├── app.ts
...

In my app.module.ts, I have

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { ConfigModule, ConfigService } from 'nestjs-config';

@Module({
  imports: [ConfigModule.load()],
  controllers: [AppController],
  providers: [AppService],
})
export class AppModule {
  constructor(private readonly config: ConfigService) {
    this.config = config;
    console.log(config);  // ConfigService { helpers: {} }
    AppModule.host = this.config.get('app.url');
    console.log( 'App URL is',  this.config.get('app.url') ); // App URL is undefined
  }
...
}

What could I be doing wrong?

[charbel14]

It will also be good to show how to make use of this in the bootstrap/main.ts itself. Given that access to the port is needed for example.

Ideally, config service should be one of the first things loaded in an app before even the server is started, once loaded it should be available globally always.

Also, it would be nice that if it can easily (read seamlessly) be injected as middleware so it reloads at runtime and only if files changed for perf reasons.

See : Golang Env Config for some ideas. I have used this go module previously.

[mrpharderwijk]

~Any news on this one? Currently my only workaround is defining the service in the constructor and access the env variables by process.env directly. This defies to whole purpose of the ConfigService than only exposing the environment variables…~

@bashleigh Please update the readme to remove the example of the empty ConfigModule.load(). For this to work its best to always define the path.