Touched some rock this weekend 😎

For my PR to infer type predicates, I needed to understand TypeScript's control flow graph. So I added a graph visualization to David Sherret's amazing TypeScript AST Viewer. It's live now and very fun to play with! Edges go backwards in execution order. ts-ast-viewer.com/#code/GYVwdgxg…

Node excitement 😉 Congrats to Joyee Cheung at Igalia on landing **experimental** support for require(ESM) in Node 🎉 The intent is to allow more CommonJS packages to migrate to ESM without breaking compatibility. This should help eliminate the [ERR_REQUIRE_ESM] error 👍

TypeScript excitement 😉 Congrats to Titian Cernicova-Dragomir 💙💛 Tech At Bloomberg on landing --isolatedDeclarations in upstream TypeScript 🎉 It's the start of a journey to faster type-checking at scale 🔥 An epic collab between folk in TS, Bloomberg & Google 👍 github.com/microsoft/Type…

Announcing TypeScript 5.5 Beta! 📣 Now with type predicate inference, more type narrowing, an @‍import tag for JSDoc, the --isolatedDeclarations flag, performance & reliability improvements, and much more! devblogs.microsoft.com/typescript/ann…

This brings up some great questions about a confusing topic, but the advice Brandon found in his research is bad advice! My full explanation via blog post: blog.andrewbran.ch/default-export…

Dual publishing ESM and CJS is hard. Getting the types incorrect in your package.json is disappointingly easy. If you want something to help you with both, then maybe tsup and Are the Types Wrong can help. Thanks to Andrew Branch for his assistance with this ❤️🌻 johnnyreilly.com/dual-publishin…

Editing with @britto_gab's work on region-prioritized diagnostics has been so great: > in our testing on TypeScript’s own checker.ts, a full semantic diagnostics response took 3330ms. In contrast, the response for the first region-based diagnostics response took 143ms! 👏

Node.js v23.6.0 is out! 🥳🎉 This release enables the flag --experimental-strip-types by default. Node.js will execute TypeScript files without additional configuration! ⚠️ This feature is experimental, has limitations and is subject to change. nodejs.org/en/blog/releas…

Today we're thrilled to announce our effort to port the TypeScript compiler and language service to native code, gaining a 10x speed boost in build times and editor responsiveness! devblogs.microsoft.com/typescript/typ…

The new TypeScript is *really* fast