TypeScript 3.5 fixes ‘unbearably slow’ type-checking bug
TypeScript 3.5, the latest version of Microsoft’s popular typed superset of JavaScript, is now available in a release candidate. The update is set to add optimizations for type-checking, addressing a serious speed regression introduced with the previous release.
With TypeScript 3.5, Microsoft’s TypeScript development team focused on optimizing code paths and stripping down certain functionality to make TypeScript faster. Compile times have fallen compared to TypeScript 3.4; code completion and other editor operations should be “snappier” as well, the TypeScript developers noted.