NestJS tip: how to disable initialization logging

for NestJS v8, v9 and v10

For big NestJS apps we might see a bunch of initialization logs like the following:

In some environments those messages are nothing but noise to the log management tool. Note that I'm referring to those emitted with the .log method of the built-in Logger class from @nestjs/common

By following the nestjs docs on Logger: https://docs.nestjs.com/techniques/logger we can find out on how to omit such logs, as follows:

Create a custom logger that inherits from the built-in ConsoleLogger and declare that it will do nothing if the supplied context is a internal one (ie, from @nestjs/core)

// ...
import { ConsoleLogger } from '@nestjs/common'

/**
 * A custom logger that disables all logs emitted by calling `log` method if
 * they use one of the following contexts:
 * - `InstanceLoader`
 * - `RoutesResolver`
 * - `RouterExplorer`
 * - `NestFactory`
 */
export class InternalDisabledLogger extends ConsoleLogger {
  static contextsToIgnore = [
    'InstanceLoader',
    'RoutesResolver',
    'RouterExplorer',
    'NestFactory', // I prefer not including this one
  ]

  log(_: any, context?: string): void {
    if (!InternalDisabledLogger.contextsToIgnore.includes(context)) {
      super.log.apply(this, arguments)
    }
  }
}

Then, at your bootstrap function, use that logger instead

// ...
const app = await NestFactory.create(AppModule, {
  logger: new InternalDisabledLogger(),
})