TypeScript Strict Rules Pack

The Problem

Cursor takes shortcuts with TypeScript — any types, non-null assertions, loose checks. You end up with code that compiles but breaks at runtime.

The Fix

Drop one .cursorrules file into your project root. Cursor immediately writes strict, production-safe TypeScript.

What's Inside

🔷 Strict Type Patterns

• unknown with type guards instead of any
• Discriminated unions for complex state
• Branded types for IDs and special strings
• Explicit return types on all functions
• Const assertions and readonly patterns

🛡️ Runtime Safety

• Zod schemas for external data validation
• Proper error handling with typed errors
• Exhaustive switch statements
• No non-null assertions (!)

⚙️ Compiler Flags

• strict: true baseline
• noUncheckedIndexedAccess
• exactOptionalProperties
• noImplicitOverride
• verbatimModuleSyntax

🚫 Anti-Patterns Blocked

• No any types
• No as type assertions (use type guards)
• No ! non-null assertions
• No implicit any in callbacks
• No @ts-ignore

Setup

1. Download the .cursorrules file
2. Drop it in your project root
3. Done. Cursor picks it up automatically.

What You Get

• .cursorrules file (works immediately)
• README.md with full documentation
• SETUP.md with installation guide and tsconfig recommendations