Nest Shared

A collection of shared NestJS modules published to npm as @lyrolab/nest-shared. Provides reusable infrastructure components for NestJS applications across LyroLab projects.

Installation

npm install @lyrolab/nest-shared

Note: @lyrolab/nest-shared declares many peer dependencies. You'll need to install the ones you actually use. See each module's README for its specific peer dependency requirements.

Module Catalog

| Module | Import Path | Description | Key Exports | Requires Config | |--------|-------------|-------------|-------------|:--------------:| | AI | @lyrolab/nest-shared/ai | OpenRouter AI service with response caching | SharedAiModule, AiService, AI_MODULE_OPTIONS | ✅ | | Auth | @lyrolab/nest-shared/auth | JWT/Keycloak authentication | SharedAuthModule, JwtAuthGuard, @Public(), @CurrentUser(), keycloakConfig() | ✅ | | Bootstrap | @lyrolab/nest-shared/bootstrap | Application setup (CORS, ValidationPipe, Swagger, filters) | configureApp() | ✅ | | Bull | @lyrolab/nest-shared/bull | BullMQ queue integration backed by Redis | SharedBullModule | ✅ | | Cache | @lyrolab/nest-shared/cache | Redis-backed caching (preferred over raw Redis) | SharedCacheModule | ✅ | | Database | @lyrolab/nest-shared/database | TypeORM + PostgreSQL connection with TestContainers | SharedDatabaseModule, TypeOrmExceptionFilter | ✅ | | ESLint | @lyrolab/nest-shared/eslint | Shared ESLint config with custom architecture rules | nestArchitecturePlugin | ❌ | | Health | @lyrolab/nest-shared/health | Health check endpoint via Terminus | SharedHealthModule | ❌ | | Queue | @lyrolab/nest-shared/queue | Job processing with decorator-based processors | SharedQueueModule, QueueService, @JobProcessor() | ✅ | | Redis | @lyrolab/nest-shared/redis | Low-level Redis configuration | SharedRedisModule, RedisConfig | ✅ |

Quick Start

// app.module.ts
import { Module } from "@nestjs/common"
import { ConfigModule } from "@nestjs/config"
import { SharedAuthModule } from "@lyrolab/nest-shared/auth"
import { SharedBootstrapModule } from "@lyrolab/nest-shared/bootstrap"
import { SharedCacheModule } from "@lyrolab/nest-shared/cache"
import { SharedDatabaseModule } from "@lyrolab/nest-shared/database"
import { SharedHealthModule } from "@lyrolab/nest-shared/health"
import { keycloakConfig } from "@lyrolab/nest-shared/auth"

@Module({
  imports: [
    ConfigModule.forRoot({ isGlobal: true }),
    SharedDatabaseModule.forRoot({
      entities: [__dirname + "/**/*.entity{.ts,.js}"],
    }),
    SharedAuthModule.forRoot(
      keycloakConfig(
        process.env.KEYCLOAK_URL ?? "http://localhost:8080",
        process.env.KEYCLOAK_REALM ?? "lyrochat",
      ),
    ),
    SharedCacheModule.forRoot(),
    SharedHealthModule,
  ],
})
export class AppModule {}

// main.ts
import { NestFactory } from "@nestjs/core"
import { configureApp } from "@lyrolab/nest-shared/bootstrap"
import { AppModule } from "./app.module"

async function bootstrap() {
  const app = await NestFactory.create(AppModule)
  configureApp(app) // Sets up CORS, ValidationPipe, Swagger, global filters
  await app.listen(process.env.PORT ?? 3000)
}
bootstrap()

Using Modules in Services

import { Injectable } from "@nestjs/common"
import { Inject } from "@nestjs/common"
import { CACHE_MANAGER } from "@nestjs/cache-manager"
import { Cache } from "cache-manager"
import { AiService } from "@lyrolab/nest-shared/ai"
import { QueueService } from "@lyrolab/nest-shared/queue"
import { generateText } from "ai"

@Injectable()
export class MyService {
  constructor(
    private readonly aiService: AiService,
    private readonly queueService: QueueService,
    @Inject(CACHE_MANAGER) private cache: Cache,
  ) {}

  async process(input: string) {
    const cached = await this.cache.get(`input:${input}`)
    if (cached) return cached

    const result = await generateText({
      model: this.aiService.model,
      system: "You are a helpful assistant.",
      prompt: input,
    })

    await this.cache.set(`input:${input}`, result.text)
    return result.text
  }
}

Environment Variables

| Variable | Required | Used By | Description | |----------|:--------:|---------|-------------| | DATABASE_URL | ✅ | Database | PostgreSQL connection string | | REDIS_URL | ✅ | Redis, Cache, Bull, Queue | Redis connection string | | FRONTEND_URL | ✅ | Bootstrap | Frontend origin for CORS | | JWKS_URI | ✅ | Auth | JWKS endpoint for JWT verification | | JWT_ISSUER | ✅ | Auth | JWT issuer to validate against | | PORT | ❌ | Bootstrap | App listen port (default: 3000) | | CACHE_TTL | ❌ | Cache | Cache TTL in seconds | | OPENROUTER_API_KEY | ✅ | AI | OpenRouter API key | | NODE_ENV | ❌ | All | Set to test for TestContainers mode |

Development

Local Setup

# Clone and install
git clone https://github.com/lyrolab/nest-shared.git
cd nest-shared
npm install

# Build
npm run build

# Run tests
npm test
npm run test:cov   # With coverage

# Watch mode
npm run dev

Adding a New Module

1. Create src/<module>/ with index.ts barrel export.
2. Write a README.md in the module directory.
3. Add the export entry in package.json:

"./<module>": {
  "types": "./dist/<module>/index.d.ts",
  "import": "./dist/<module>/index.js",
  "require": "./dist/<module>/index.js"
}

4. Add a row to the Module Catalog table in this README.

Code Quality

npm run lint        # ESLint
npx lint-staged     # Pre-commit checks
npm test            # Jest

Publishing

This package uses semantic-release for automated publishing on the main branch.

• feat: commits → minor version bump
• fix: commits → patch version bump
• feat!: or fix!: commits → major version bump

See CLAUDE.md for detailed contribution conventions.