Antigravity Implementation Workflow

# Antigravity Implementation Workflow

Master the complete implementation workflow with Google Antigravity IDE. This comprehensive guide covers project setup, development phases, and deployment strategies for production applications.

## Why Antigravity Workflow?

Google Antigravity IDE provides an intelligent development workflow powered by Gemini 3. This guide helps you leverage agentic coding for maximum productivity.

## Project Initialization

```markdown
# .antigravity

## Project Configuration
- Framework: Next.js 14 with App Router
- Language: TypeScript (strict mode)
- Styling: Tailwind CSS with custom design system
- Database: PostgreSQL with Prisma ORM
- Authentication: NextAuth.js with OAuth providers

## Development Standards
- Follow functional and declarative programming patterns
- Use TypeScript strict mode with explicit return types
- Apply React Server Components where possible
- Implement proper error boundaries and loading states

## File Structure
src/
├── app/           # Next.js App Router pages
├── components/    # React components
│   ├── ui/        # Primitive UI components
│   └── features/  # Feature-specific components
├── lib/           # Utility functions and configurations
├── hooks/         # Custom React hooks
├── services/      # API and external service integrations
└── types/         # TypeScript type definitions

## Code Style Guidelines
- Use descriptive variable names (e.g., isLoading, hasError)
- Prefer named exports over default exports
- Keep functions small and focused
- Document complex logic with comments
```

## Phase 1: Foundation Setup

```typescript
// lib/config.ts
export const config = {
  app: {
    name: "Antigravity App",
    url: process.env.NEXT_PUBLIC_APP_URL!,
    env: process.env.NODE_ENV,
  },
  database: {
    url: process.env.DATABASE_URL!,
  },
  auth: {
    secret: process.env.NEXTAUTH_SECRET!,
    providers: {
      google: {
        clientId: process.env.GOOGLE_CLIENT_ID!,
        clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
      },
    },
  },
} as const;

// Validate required environment variables
function validateEnv() {
  const required = ["DATABASE_URL", "NEXTAUTH_SECRET"];
  const missing = required.filter((key) => !process.env[key]);
  
  if (missing.length > 0) {
    throw new Error(`Missing environment variables: ${missing.join(", ")}`);
  }
}

validateEnv();
```

## Phase 2: Core Implementation

```typescript
// Agent prompt for feature implementation
/*
@antigravity implement user authentication

Requirements:
1. Email/password and OAuth (Google, GitHub)
2. Session management with JWT
3. Protected routes middleware
4. User profile management

Generate:
- Auth configuration in lib/auth.ts
- Login and register components
- Protected route wrapper
- API routes for auth endpoints
*/

// lib/auth.ts - Generated by Antigravity
import NextAuth from "next-auth";
import GoogleProvider from "next-auth/providers/google";
import GitHubProvider from "next-auth/providers/github";
import CredentialsProvider from "next-auth/providers/credentials";
import { PrismaAdapter } from "@auth/prisma-adapter";
import { prisma } from "@/lib/prisma";
import { verifyPassword } from "@/lib/password";

export const { handlers, auth, signIn, signOut } = NextAuth({
  adapter: PrismaAdapter(prisma),
  session: { strategy: "jwt" },
  pages: {
    signIn: "/login",
    error: "/auth/error",
  },
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID!,
      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
    }),
    GitHubProvider({
      clientId: process.env.GITHUB_CLIENT_ID!,
      clientSecret: process.env.GITHUB_CLIENT_SECRET!,
    }),
    CredentialsProvider({
      name: "credentials",
      credentials: {
        email: { label: "Email", type: "email" },
        password: { label: "Password", type: "password" },
      },
      async authorize(credentials) {
        if (!credentials?.email || !credentials?.password) {
          return null;
        }
        
        const user = await prisma.user.findUnique({
          where: { email: credentials.email as string },
        });
        
        if (!user || !user.password) {
          return null;
        }
        
        const isValid = await verifyPassword(
          credentials.password as string,
          user.password
        );
        
        return isValid ? user : null;
      },
    }),
  ],
  callbacks: {
    async jwt({ token, user }) {
      if (user) {
        token.id = user.id;
        token.role = user.role;
      }
      return token;
    },
    async session({ session, token }) {
      if (session.user) {
        session.user.id = token.id as string;
        session.user.role = token.role as string;
      }
      return session;
    },
  },
});
```

## Phase 3: Testing & Quality

```typescript
// Antigravity testing workflow
/*
@antigravity generate tests

Test coverage for:
- Unit tests for utility functions
- Integration tests for API routes
- Component tests for UI elements
- E2E tests for critical user flows

Use: Vitest, React Testing Library, Playwright
*/

// Example generated test
import { describe, it, expect, vi } from "vitest";
import { render, screen, waitFor } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { LoginForm } from "@/components/auth/LoginForm";

describe("LoginForm", () => {
  it("submits with valid credentials", async () => {
    const onSubmit = vi.fn();
    render(<LoginForm onSubmit={onSubmit} />);
    
    await userEvent.type(screen.getByLabelText(/email/i), "test@example.com");
    await userEvent.type(screen.getByLabelText(/password/i), "password123");
    await userEvent.click(screen.getByRole("button", { name: /sign in/i }));
    
    await waitFor(() => {
      expect(onSubmit).toHaveBeenCalledWith({
        email: "test@example.com",
        password: "password123",
      });
    });
  });
});
```

## Phase 4: Deployment

```yaml
# Antigravity deployment configuration
# docker-compose.yml
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=${DATABASE_URL}
      - NEXTAUTH_SECRET=${NEXTAUTH_SECRET}
    depends_on:
      - db
  
  db:
    image: postgres:16
    environment:
      - POSTGRES_DB=antigravity
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=${DB_PASSWORD}
    volumes:
      - postgres_data:/var/lib/postgresql/data
```

## Best Practices

- Define clear project rules in .antigravity
- Use phased implementation approach
- Generate comprehensive tests automatically
- Apply consistent code style
- Document architecture decisions
- Implement CI/CD from the start

Google Antigravity IDE accelerates development with intelligent code generation and ensures consistent, production-ready implementations.