TypeScript 7.0 Beta is here! Built on a new native and parallelized foundation, it's already being used on multi-million line codebases. Read up more here and try it on your projects today!

TypeScript 6.0 is now available! This release brings better type-checking for methods, new standard library features, new module features for Node.js, and more! But most important, this release brings us one step closer to the upcoming native-speed 7.0!

TypeScript 6.0 beta is now published! This release brings - inference improvements for functions - updates to package.json 'imports' - the Temporal APIs - alignments for the upcoming TypeScript 7.0 - & more! Try it today!

TypeScript 5.9 is now available! 📣 This release brings: ✅ An updated tsc --init ✅ Type-checking for the new 'import defer' ✅ Actual summaries in more DOM APIs ✅ Expandable quick info hovers (✨preview✨) and more! Read up more on our blog:

⚡ TypeScript 7 compiles the 2.3M-line @code codebase in under five seconds. See @ahejlsberg explain how the new Go-powered compiler and language service scale with shared-memory concurrency. 📖 Read more:

Huge TypeScript AI day today! Live from London 09.30-16.30: 9:40 - 9:55 AM: Opening Keynote → Sam Bhagwat, Shane Thomas, Abhi Aiyer, Co-Founders @ Mastra 10:00 - 10:15 AM: Evals Are the New TDD → RL Nabors, Developer Experience @ Arize 10:20 - 10:35 AM: Deploying AI Agents Where Your Customers Actually Want Them → Raphaël Titsworth-Morin, Senior Developer & Evangelist @ Defang 10:40 - 10:55 AM: What I Learned Shipping FGA to Production → Tiffany Lozenski, Founding Product Engineer @ Palette 11:30 - 11:50 AM: The CLI Is Dead, Long Live The CLI → Jan Peer Stöcklmair, Senior Software Engineer @ Sentry 11:55 - 12:15 PM: Agentic UX: How The AG-UI Protocol Is Redefining AI-Driven User Experience → Tyler Slaton, Founding Engineer & Head of Open Source @ CopilotKit 12:20 - 12:35 PM: Building an OpenSearch Research Agent at Scale → Alfonso Graziano, AI Tech Lead @ Nearform 1:45 - 2:00 PM: Why Monetizing Agents Needs Different Infrastructure → John Yeo, CTO @ Autumn → Charlie Lamb, Founding Engineer @ Autumn 2:05 - 2:25 PM: Even TS Agents Need Retrieval → Carly Richmond, Developer Advocate Lead @ Elastic 2:30 - 2:55 PM: From Magic to Harness: Building an AI Agent for a 25-Product SaaS Company → Ilyà Zayats, CTO @ Factorial 3:00 - 3:15 PM: Designing Zero Trust Harnesses → Ohans Emmanuel, Co-Founder @ Coldtea 3:20 - 3:35 PM: Building Cloud Coding Agents on Prisma Compute → Tyler Hogarth, Head of Engineering @ Prisma 3:40 - 3:55 PM: What We Learned Building Our Own Agent Harness → Danilo Delizia, AI Architect @ commercetools 4:00 - 4:20 PM: The Agentic Repository Automation Revolution → Don Syme, Principal Researcher @ GitHub Next 4:25 - 4:30 PM: Closing Remarks → Sam Bhagwat, Shane Thomas, Abhi Aiyer, Co-Founders @ Mastra

The agent hits a TypeScript error, adds `as any` to shut it up, and the build goes green. The type was warning about a field that is sometimes missing. That exact runtime crash shipped to production three days later. The cast didn't fix the bug. It just moved the stack trace.