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TypeScript 4.0 beta is here

Microsoft has announced the first beta release for TypeScript 4.0. The most recent version of the language, TypeScript 3.9, was released last month.  TypeScript 3.9 had introduced speed and user experience improvements. TypeScript 4.0 follows Microsoft’s pattern of trying to introduce new features that don’t introduce breaking changes for older versions.  The next version doesn’t add many breaking changes, but adds new features...