Runtime Briefing — TypeScript 5.0 Release
TypeScript 5.0 shipped on 16 March 2023 with stable decorators, const type parameters, and faster incremental builds, requiring frontend and Node.js toolchains to validate compiler upgrades.
Executive briefing: Microsoft released TypeScript 5.0 on , unlocking long-awaited language ergonomics and compiler improvements.
Language and tooling changes
- Decorators reach stage 3 support. The compiler ships ECMAScript-standard decorators, impacting framework metadata patterns in Angular and NestJS.
- Const type parameters. New syntax tightens generic APIs, requiring dependency updates for libraries that adopt the feature.
- Performance. Compiler pipeline optimisations deliver faster builds, influencing CI job timings and developer feedback loops.
Upgrade guidance
- Review framework release notes (Angular, React tooling, NestJS) for TypeScript 5.0 compatibility and update lockfiles accordingly.
- Enable TypeScript 5.0 in staging pipelines, tracking decorator metadata emission changes and eslint/ts-jest compatibility.
- Update documentation and training so teams understand new syntax and the retirement timeline for legacy experimental decorators.