Type Safety

Type safety is like having an assistant who checks your work before you submit it. It catches a whole category of bugs automatically.

With vs Without Type Safety

What Types Catch

// TypeScript prevents these mistakes:
const price: number = "free"        // Error: string isn't a number
const user: User = { nam: "Jane" }  // Error: 'nam' isn't a valid field
calculateTotal(null)                 // Error: null isn't allowed here

Types and AI

Type safety makes AI-generated code more reliable:

1. AI generates typed code — Functions declare what they expect
2. Compiler verifies — Mismatches caught immediately
3. Editor assists — Autocomplete shows only valid options
4. Refactoring safety — Change a type, see all affected code

Getting Started with Type Safety

You don't need to be a TypeScript expert:

• Let AI write the types — It's excellent at this
• Read the red squiggles — They're telling you about real problems
• Start with strict: false — Gradually increase strictness
• Use type inference — TypeScript often figures out types automatically

The Payoff

Type safety adds a small upfront cost (defining types) for a large ongoing benefit (fewer bugs, better tooling, safer refactoring). For vibe coding, where AI generates lots of code quickly, type safety is your quality assurance layer.