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TypeScript Development

Catching the errors that tests would not have covered.

TypeScript adds a static type system to JavaScript. It changes the class of mistakes that reach production: a renamed field, a value that can be null, or a function called with the wrong shape becomes a build error rather than an exception in front of a user.

Its second benefit is editor tooling. Reliable autocomplete, safe renaming and find-all-references make navigating an unfamiliar codebase substantially faster, which matters most on the projects nobody has looked at for a year.

Why we use it

We use it on any JavaScript that will be maintained beyond its first release. The cost is modest — some annotation, occasional friction with poorly typed libraries — and the return is that a whole family of defects is caught before review, let alone before production.

It is not a substitute for tests. Types verify shape, not behaviour; a correctly typed function can still calculate the wrong answer. Used together they cover different ground.

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