TypeScript development

• Your application is more than a small script, where types catch bugs before they reach users.
• More than one person will work on the code, now or later, and you want it to be self-documenting.
• You expect the codebase to live and grow for years, where safe refactoring matters.
• You want a new developer to understand the shape of the data without reading every line.

• For a throwaway script or a tiny prototype, the setup cost of types may not pay off yet.
• If a team genuinely has no TypeScript experience and the project is small and short-lived, plain JavaScript can be pragmatic, though we rarely find that to be the case.
• Types describe shape, not behavior, so they reduce a class of bugs but never replace tests, and we use both.

We write our front-ends and Node.js services in TypeScript by default. The editor flags mismatches as we type, so bugs are caught at the desk rather than in production, and the types double as living documentation for the next developer. We tune the strictness to the project and hand over a codebase that is genuinely safer to change.