Development Guide

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Code Organization

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Feature Development

1. Create a new directory in src/features/
2. Add feature-specific components and subcomponents
3. Keep components focused and reusable

features/
├── auth/
├── chat/
└── dashboard/

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Component Development

1. Use TypeScript for all components
2. Implement proper prop types
3. Use shadcn/ui components when possible
4. Follow atomic design principles

// components/ui/Button.tsx
import { ButtonProps } from '@/types'
import { cn } from '@/utils'

export const Button = ({ className, ...props }: ButtonProps) => {
  return (
    <button
      className={cn(
        'rounded-md bg-primary px-4 py-2 text-white',
        className
      )}
      {...props}
    />
  )
}

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State Management

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When to Use What

1. React Context
   • Global UI state
   • Theme preferences
   • Auth state
2. tRPC + React Query
   • Server state
   • Data fetching
   • Real-time updates

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API Development

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tRPC Router Structure

// routers/user.ts
import { z } from 'zod'
import { publicProcedure, router } from '../trpc'

export const userRouter = router({
  getProfile: publicProcedure
    .input(z.object({ id: z.string() }))
    .query(async ({ input, ctx }) => {
      // Implementation
    }),
})

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Error Handling

1. Use custom error classes
2. Implement proper error boundaries
3. Handle API errors gracefully

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Database Operations

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Prisma Best Practices

1. Use transactions for related operations
2. Implement proper error handling
3. Use type-safe queries
4. Follow naming conventions

// services/user.ts
import { prisma } from '@/lib/prisma'

export const userService = {
  async createUser(data: CreateUserInput) {
    return prisma.$transaction(async (tx) => {
      const user = await tx.user.create({
        data: {
          ...data,
          profile: {
            create: {
              // Profile data
            }
          }
        }
      })
      return user
    })
  }
}

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Styling Guidelines

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Tailwind CSS

1. Use utility classes
2. Follow the design system
3. Use CSS variables for theming
4. Implement responsive design

<div className="
  flex flex-col
  space-y-4
  p-4
  md:flex-row md:space-x-4 md:space-y-0
">
  {/* Content */}
</div>

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Component Styling

1. Use CSS Modules for complex styles
2. Implement dark mode support
3. Follow accessibility guidelines

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Performance

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Optimization Techniques

1. Use proper image optimization
2. Implement code splitting
3. Optimize bundle size
4. Use proper caching strategies

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Security

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Best Practices

1. Implement proper authentication
2. Use secure headers
3. Sanitize user input
4. Follow OWASP guidelines

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Environment Variables

1. Use proper secrets management
2. Implement environment validation
3. Use different configs per environment
4. Document all variables in .env.example