TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. As an analogy, if JavaScript were CSS then TypeScript would be SCSS. All the valid JavaScript code that you write is also valid TypeScript code.
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TypeScript for Beginners, Part 1: Getting Started
TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. As an analogy, if JavaScript were CSS then TypeScript would be SCSS. All the valid JavaScript code that you write is also valid TypeScript code.
Full article