Moving from JavaScript to TypeScript
TypeScript catches errors at compile time and makes large codebases safer to change. A short guide to why and how to make the move.
Insights
Engineering
TypeScript is able to flag errors at compile time, during development, rather than leaving them to surface at runtime. On a growing codebase, that difference compounds quickly.
It is used for type checking — sometimes called structural subtyping or 'duck typing' — and its interfaces let you describe the shape of data so the compiler can keep you honest as the code evolves.
Why teams make the move
- Errors caught in the editor, not in production
- Safer refactoring across large codebases
- Self-documenting interfaces and better tooling
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