typescript

To refactor JavaScript to TypeScript, enforce strict mode, replace `any` with `unknown`, and apply proper type annotations. This process ensures type correctness, leverages advanced type patterns, and reduces runtime bugs in your `.ts` or `.tsx` files.

Advanced TypeScript generics and conditional types are used to create flexible, reusable type definitions. By leveraging mapped types and discriminated unions, you guide complex type system features to enforce strict conventions and improve code maintainability.

Yes, you need fundamental JavaScript knowledge as a prerequisite. TypeScript enforces type system conventions on top of JavaScript constructs, so understanding the base language is required before applying strict mode and advanced type-level programming patterns.

TypeScript strict mode prevents common type errors by enforcing explicit type annotations and rejecting implicit `any` types. It guides you to use `unknown` and discriminated unions, ensuring type correctness and catching potential runtime bugs during development.

You should use `unknown` over `any` when you want to enforce type safety without losing type checking. Unlike `any`, `unknown` requires explicit type narrowing before operations, preventing common errors and ensuring robust, type-safe TypeScript code.

Configuring `tsconfig` for strict mode involves enabling strict type checking options to enforce type safety. This setup guides the compiler to catch errors early, requiring proper type annotations and preventing implicit `any` usage in your `.ts` and `.tsx` files.