codependix-configuration

Imported from JimmyPaolini/codebase (packages/ic-suite/codependix/codependix-configuration/AGENTS.md). Install upstream with npx skills add JimmyPaolini/codebase --skill codependix-configuration. Copyright stays with the author.

CodependixConfiguration: NestJS Service Application

Quick Start

Type: Node.js service application (NestJS + NestFactory)

Purpose:

Architecture Overview

Tech Stack

• Framework: NestJS (modules, dependency injection, providers)
• Bootstrap: NestFactory.create (standard NestJS bootstrap)
• Env validation: @nestjs/config + zod (environmentSchema in .constants.ts)
• Logging: @codebase/logger — a pino-backed LoggerService (Scope.TRANSIENT)
• Language: Strict TypeScript

Execution Flow

src/main.ts
  └─ NestFactory.create(MainModule)
       └─ domain service modules            ← add under src/modules/

Directory Layout

src/
  main.ts                           # Bootstrap — do not modify
  main.module.ts                    # Root NestJS module (imports ConfigModule, LoggerModule)
  constants.ts                      # Zod environmentSchema for env validation
  modules/
    <domain>/                       # Add feature modules here
      <domain>.module.ts
      <domain>.service.ts
      <domain>.types.ts
      <domain>.constants.ts
      <domain>.<tier>.test.ts
testing/                            # Shared test utilities

Development

Adding Business Logic

1. Add domain service modules — create src/modules/<domain>/ with a NestJS module, service, types, and constants.
2. Register in root module — import the new module in main.module.ts.
3. Validate env vars — extend environmentSchema in constants.ts with all required environment variables.

Logging

LoggerService and LoggerModule come from @codebase/logger — this project does not define its own logger. Add "@codebase/logger": "workspace:*" to dependencies, then import LoggerModule once in the root module; it is @Global(), so feature modules inject LoggerService without importing it.

LoggerService is Scope.TRANSIENT — each injecting class gets its own instance. Always call setContext in the constructor:

constructor(private readonly logger: LoggerService) {
  this.logger.setContext(MyService.name);
}

Outputs structured JSON in production (NODE_ENV=production) and pretty-printed logs in development.

Key Commands

Always prefer running tasks through Nx rather than calling the underlying tools directly.

nx run codependix-configuration:typecheck-code,lint-code,format-code,deprecate-code,guard-code   # Every static check, in one graph
nx run codependix-configuration:typecheck       # tsc --noEmit
nx run codependix-configuration:oxfmt           # Formatting
nx run codependix-configuration:build           # Compile for publication

Testing

Follow the codebase's strict three-tier testing strategy. Co-locate test files with the source they test.

nx run codependix-configuration:vitest:unit          # Fast (<100ms) — pure logic, mocked DI
nx run codependix-configuration:vitest:integration   # Moderate (1-2s) — real database/API I/O
nx run codependix-configuration:vitest:end-to-end    # Slow (30-60s) — full service initialization

See the testing-strategy skill and testing-mocks skill for patterns and mock conventions.

Writing Modules

Use the generator to scaffold new domain modules, then implement the service:

nx g conformetry:nestjs-service-module --name=<domain>

This creates five files in src/modules/<domain>/:

Module file

Register the service in both providers and exports so consumers can inject it:

@Module({
  controllers: [],
  exports: [MyDomainService],
  imports: [LoggerModule],
  providers: [MyDomainService],
})
export class MyDomainModule {}

Add a JSDoc comment on the module class describing what domain it owns.

Service file

Follow the section-comment layout from the template — it keeps large services scannable:

@Injectable()
export class MyDomainService {
  // 🏗 Dependency Injection
  constructor(private readonly logger: LoggerService) {
    this.logger.setContext(MyDomainService.name);
  }

  // 🔐 Private Fields

  // 🔑 Public Fields

  // 🔏 Private Methods

  // 🌎 Public Methods
}

Key rules:

• Call setContext in every constructor — always use MyClass.name, never a string literal.
• Inject LoggerService as the last constructor parameter (after repository/domain deps).
• Private first — keep internal helpers in the 🔏 Private Methods section, expose only what callers need under 🌎 Public Methods.
• readonly everything in the constructor — all injected deps must be private readonly.
• One service per module — if a service grows too large, extract a sub-domain into its own module.

Constants file

Move all inline values to .constants.ts to keep services readable:

// ♟️ Constants
export const DEFAULT_PAGE_SIZE = 100;

Types file

Put all module-local TypeScript types and interfaces in .types.ts:

// 🏷️ Types
export interface ParsedEntry {
  word: string;
  partOfSpeech: string;
}

Do not re-export types from index.ts unless they are part of the public API consumed by other modules.

Registering in the root module

After generating a module, import it in main.module.ts:

@Module({
  imports: [
    ConfigModule.forRoot({ ... }),
    LoggerModule,
    MyDomainModule,   // ← add here
  ],
  providers: [],
})
export class MainModule {}

Best Practices

• Never put business logic in main.ts — it bootstraps NestFactory only.
• Validate at the boundary — all env vars must be declared in environmentSchema; access via ConfigService, not process.env.
• Type imports — use import { type Foo } for type-only imports (enforced by ESLint).
• No any types — use unknown or proper typing; strict mode is enabled.

See the write-typescript skill for strict mode patterns.

Troubleshooting

• Dependency injection failure — verify the service is @Injectable(), exported from its module, and that module is imported by the consuming module.
• Env var validation error on startup — add the missing variable to environmentSchema in src/constants.ts and to .env.default.

See the triage-integration skill for lint and git hook failures.

Key Files

• src/main.ts: Application bootstrap
• src/main.module.ts: Root NestJS module
• src/constants.ts: environmentSchema (Zod)
• @codebase/logger (packages/logger): shared pino-backed LoggerService and LoggerModule
• project.json: Nx targets (develop, build, test, lint, typecheck, format)
• .env.default: Environment variable template