Microsoft has published a beta version of TypeScript 4.2, an update to the popular open source language that adds types to JavaScript. With a final release due February 23, TypeScript 4.2 features enhancements pertaining to tuple types and type aliases.
TypeScript 4.2, launched January 12, expands the ways rest elements in tuple types can be used. Previously, TypeScript only permitted rest elements in the last position of a tuple type. Now, rest elements can occur almost anywhere within a tuple, with a few restrictions. A rest element cannot be followed by another optional element or rest element, and only one rest element is permitted per tuple.
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