TypeScript is a programming language, a superset of JavaScript. This means any valid JavaScript program is also valid TypeScript. But not vice-versa! TypeScript adds a ton of features, addressing the shortcomings of JavaScript. The most important one is optional static typing, including null-safety. The fact that you can take any JavaScript code and turn it into TypeScript by simply changing a file extension is crucial. It means you can gradually start using TypeScript’s features without rewriting your whole application.

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