Replit Reference Architecture

Overview

Production-ready architecture patterns for Replit integrations.

Prerequisites

• Understanding of layered architecture
• Replit SDK knowledge
• TypeScript project setup
• Testing framework configured

Project Structure

my-replit-project/
├── src/
│   ├── replit/
│   │   ├── client.ts           # Singleton client wrapper
│   │   ├── config.ts           # Environment configuration
│   │   ├── types.ts            # TypeScript types
│   │   ├── errors.ts           # Custom error classes
│   │   └── handlers/
│   │       ├── webhooks.ts     # Webhook handlers
│   │       └── events.ts       # Event processing
│   ├── services/
│   │   └── replit/
│   │       ├── index.ts        # Service facade
│   │       ├── sync.ts         # Data synchronization
│   │       └── cache.ts        # Caching layer
│   ├── api/
│   │   └── replit/
│   │       └── webhook.ts      # Webhook endpoint
│   └── jobs/
│       └── replit/
│           └── sync.ts         # Background sync job
├── tests/
│   ├── unit/
│   │   └── replit/
│   └── integration/
│       └── replit/
├── config/
│   ├── replit.development.json
│   ├── replit.staging.json
│   └── replit.production.json
└── docs/
    └── replit/
        ├── SETUP.md
        └── RUNBOOK.md

Layer Architecture

┌─────────────────────────────────────────┐
│             API Layer                    │
│   (Controllers, Routes, Webhooks)        │
├─────────────────────────────────────────┤
│           Service Layer                  │
│  (Business Logic, Orchestration)         │
├─────────────────────────────────────────┤
│          Replit Layer        │
│   (Client, Types, Error Handling)        │
├─────────────────────────────────────────┤
│         Infrastructure Layer             │
│    (Cache, Queue, Monitoring)            │
└─────────────────────────────────────────┘

Key Components

Step 1: Client Wrapper

// src/replit/client.ts
export class ReplitService {
  private client: ReplitClient;
  private cache: Cache;
  private monitor: Monitor;

  constructor(config: ReplitConfig) {
    this.client = new ReplitClient(config);
    this.cache = new Cache(config.cacheOptions);
    this.monitor = new Monitor('replit');
  }

  async get(id: string): Promise<Resource> {
    return this.cache.getOrFetch(id, () =>
      this.monitor.track('get', () => this.client.get(id))
    );
  }
}

Step 2: Error Boundary

// src/replit/errors.ts
export class ReplitServiceError extends Error {
  constructor(
    message: string,
    public readonly code: string,
    public readonly retryable: boolean,
    public readonly originalError?: Error
  ) {
    super(message);
    this.name = 'ReplitServiceError';
  }
}

export function wrapReplitError(error: unknown): ReplitServiceError {
  // Transform SDK errors to application errors
}

Step 3: Health Check

// src/replit/health.ts
export async function checkReplitHealth(): Promise<HealthStatus> {
  try {
    const start = Date.now();
    await replitClient.ping();
    return {
      status: 'healthy',
      latencyMs: Date.now() - start,
    };
  } catch (error) {
    return { status: 'unhealthy', error: error.message };
  }
}

Data Flow Diagram

User Request
     │
     ▼
┌─────────────┐
│   API       │
│   Gateway   │
└──────┬──────┘
       │
       ▼
┌─────────────┐    ┌─────────────┐
│   Service   │───▶│   Cache     │
│   Layer     │    │   (Redis)   │
└──────┬──────┘    └─────────────┘
       │
       ▼
┌─────────────┐
│ Replit    │
│   Client    │
└──────┬──────┘
       │
       ▼
┌─────────────┐
│ Replit    │
│   API       │
└─────────────┘

Configuration Management

// config/replit.ts
export interface ReplitConfig {
  apiKey: string;
  environment: 'development' | 'staging' | 'production';
  timeout: number;
  retries: number;
  cache: {
    enabled: boolean;
    ttlSeconds: number;
  };
}

export function loadReplitConfig(): ReplitConfig {
  const env = process.env.NODE_ENV || 'development';
  return require(`./replit.${env}.json`);
}

Instructions

Step 1: Create Directory Structure

Set up the project layout following the reference structure above.

Step 2: Implement Client Wrapper

Create the singleton client with caching and monitoring.

Step 3: Add Error Handling

Implement custom error classes for Replit operations.

Step 4: Configure Health Checks

Add health check endpoint for Replit connectivity.

Output

• Structured project layout
• Client wrapper with caching
• Error boundary implemented
• Health checks configured

Error Handling

Issue	Cause	Solution
Circular dependencies	Wrong layering	Separate concerns by layer
Config not loading	Wrong paths	Verify config file locations
Type errors	Missing types	Add Replit types
Test isolation	Shared state	Use dependency injection

Examples

Quick Setup Script

# Create reference structure
mkdir -p src/replit/{handlers} src/services/replit src/api/replit
touch src/replit/{client,config,types,errors}.ts
touch src/services/replit/{index,sync,cache}.ts

Resources

• Replit SDK Documentation
• Replit Best Practices

Flagship Skills

For multi-environment setup, see replit-multi-env-setup.