TypeScript 5.0 has been released with a number of new features aimed at making it smaller, simpler, and faster.

TypeScript is a superset of JavaScript that adds optional static types which can be checked by the TypeScript compiler to catch common errors in your programs. TypeScript can use this information to help you avoid about mistakes like typos, missing arguments, or forgetting to check for null and undefined.

The TypeScript team says TypeScript 5.0 contains lots of powerful changes across its code structure, data structures, and algorithmic implementations. What these all mean is that your entire experience should be faster.

The new version also has an implementation of the new decorators standard and better support for ESM (ECMAScript modules) projects in Node and bundlers. Decorators are an upcoming ECMAScript feature that can be used to customize classes and their members in a reusable way.

TypeScript 4.7 introduced options to model lookup rules for ECMAScript modules in Node.js, but the implementations had a lot of restrictions that other tools don’t really enforce. Most modern bundlers prefer an import condition, and to model how bundlers work, TypeScript 5 has introduced a new strategy that meets this need.

JSDoc functionality has been expanded with the addition of @overload Support in JSDoc. In TypeScript, you can specify overloads for a function to show that a function can be called with different arguments, and possibly return different results. They can restrict how callers can actually use our functions, and refine what results they’ll get back. TypeScript 5 now allows JSDoc to declare overloads with a new @overload tag. Each JSDoc comment with an @overload tag is treated as a distinct overload for the following function declaration.

TypeScript 5 is available now.

More Information

TypeScript On NuGet

TypeScript On GitHub

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