Microsoft has released the production version of TypeScript 2.7.

Where to download TypeScript

You can download TypeScript through NuGet or via NPM. To get the TypeScript 2.7 release candidate via npm, use the following command: npm install -g typescript.

The new features in TypeScript 2.7

TypeScript 2.7 brings three noteworthy improvements: definite assignment checks for class properties, fixed length tuples, and improved narrowing for the in and instanceof operators. 

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