TypeScript 4.8 brings a series of correctness and consistency improvements under --strictNullChecks. These changes affect how intersection and union types work, and are leveraged in how TypeScript narrows types. Changes also allowed us to bring in sensible improvements in control flow analysis and type narrowing.
Table of contents
Improved Intersection Reduction, Union Compatibility, and NarrowingImproved Inference for infer Types in Template String Types--build , --watch , and --incremental Performance ImprovementsErrors When Comparing Object and Array LiteralsImproved Inference from Binding PatternsFile-Watching Fixes (Especially Across git checkout s)Find-All-References Performance ImprovementsBreaking ChangesWhat’s Next?28 Impressions2 Comments