TypeScript Application Deployment Checklist

TypeScript Application Deployment Checklist

TypeScript adds compile-time safety, but deployment still requires careful configuration. Use this checklist.

Strict TypeScript Configuration

{
  "compilerOptions": {
    "strict": true,
    "noUncheckedIndexedAccess": true,
    "noImplicitOverride": true,
    "exactOptionalPropertyTypes": true,
    "forceConsistentCasingInFileNames": true,
    "declaration": true,
    "sourceMap": true,
    "outDir": "./dist"
  }
}

• [ ] strict: true enabled
• [ ] noUncheckedIndexedAccess for safer array/object access
• [ ] Source maps generated for production debugging
• [ ] Output directory configured

Build Process

# Type check without emitting
tsc --noEmit

# Build for production
tsc --project tsconfig.build.json

# Or use a bundler for frontend
vite build

• [ ] Type checking passes with zero errors
• [ ] Type checking runs in CI pipeline
• [ ] Build output is clean (no stale files)
• [ ] Bundle size analyzed for frontend projects

Runtime Validation

TypeScript types disappear at runtime. Validate external data:

import { z } from 'zod';

const UserSchema = z.object({
  id: z.string().uuid(),
  email: z.string().email(),
  role: z.enum(['admin', 'user']),
});

type User = z.infer<typeof UserSchema>;

// Validate at API boundaries
app.post('/users', (req, res) => {
  const result = UserSchema.safeParse(req.body);
  if (!result.success) {
    return res.status(400).json({ errors: result.error.issues });
  }
  createUser(result.data); // Fully typed
});

• [ ] Zod or similar validation at all API boundaries
• [ ] Environment variables validated at startup
• [ ] External API responses validated

Dependencies

• [ ] @types/* packages match library versions
• [ ] No any casts hiding type errors
• [ ] dependencies vs devDependencies correctly split

Error Tracking

• [ ] Source maps uploaded to Bugsly for readable stack traces
• [ ] Error handler captures TypeScript runtime errors
• [ ] Unhandled promise rejections caught

CI/CD Pipeline

steps:
  - run: npm ci
  - run: npx tsc --noEmit    # Type check
  - run: npm run lint
  - run: npm test
  - run: npm run build

• [ ] Type checking is a required CI step
• [ ] Lint rules enforce TypeScript best practices
• [ ] Tests run against compiled output