better-agents / rules

---
description: Enforce strict TypeScript typing without any types
applyWhen: "working with TypeScript files that introduce new types or modify existing type definitions"
---

# TypeScript Strict Typing

**Never use `any` type.** Use `unknown` for dynamic data, proper interfaces for complex objects, and specific union types for known value sets.

### Examples:
```typescript
// ❌ Bad
function processData(data: any) { ... }
const context: Record<string, any>;

// ✅ Good
type LogContext = Record<string, unknown>;
interface Config { language: string; framework: string; }
type Status = 'success' | 'error' | 'pending';
```