JavaScript with added type checking that catches bugs before your code runs.
TypeScript is a superset of JavaScript that adds static type checking. It lets you define what type of data your variables, Function parameters, and return values should be -- and catches mistakes before you run your code.
TypeScript is used by most professional teams because it makes codebases easier to understand, refactor, and maintain. All valid JavaScript is valid TypeScript, so you can adopt it gradually. TypeScript defines types for Props, interfaces for API responses, and structures for objects.
TypeScript integrates with npm dependencies, powers Edge Functions, works with linting tools for code quality, and enhances IDE autocomplete. Claude Code writes excellent TypeScript code.
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