TypeScript 6.0 beta released with new defaults and major deprecations

TypeScript 6.0 beta introduces several breaking changes and prepares users for the upcoming TypeScript 7.0 transition to a new Go-based compiler. The release deprecates many legacy features, including es5 target and classic module resolution, and changes defaults for core options like strict mode and module target. ES2025 APIs and new types such as Temporal, RegExp.escape, and upsert methods are also added, while the new --stableTypeOrdering flag aids in migration planning.