What does "TypeScript" mean in programming?

TypeScript is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.

Definition

A statically typed superset of JavaScript developed by Microsoft. TypeScript adds optional type annotations that are checked at compile time, catching errors before the code runs. It compiles down to plain JavaScript, so it runs anywhere JavaScript runs.

Example

"Switching to TypeScript caught dozens of null pointer bugs at compile time that would have hit users in production."

Related terms

JavaScript
type checking
type safety
compiler
frontend

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