TypeScript 3.9 slashes compile times for packages

TypeScript 3.9, the next version of the popular typed superset of JavaScript from Microsoft, has arrived as a beta release, with fixes to address extremely poor editing and compilation speeds associated with some packages.

The TypeScript team had observed these performance issues with packages such as material-ui and styled-components. A series of six pull requests, covering operations such as using objects instead of closures for type mappers and optimizing of deferred type references, have resulted in significant reductions of compile times — roughly 40 percent in the case of material-ui, for example.

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