Contributions: Nov 1–8, 2026

14 substantial PRs (9 merged, 6 open/draft). 13 in workerd, 1 in node.

workerdMerged#8236

Consolidate Event subclasses to prepare for TypeScript migration

workerdMerged#8199

Add embedder per-isolate bootstrap hook for custom scripts

workerdMerged#8192

Fourth round of TypeScript streams performance improvements, narrowing gaps with C++

workerdMerged#8188

Third round of TypeScript streams performance improvements, reducing overall time to 0.22x C++

workerdMerged#8174

Additional performance improvements for TS-Streams, achieving 3.6x faster overall performance compared to C++

workerdMerged#8109

Migration of EventSource to TypeScript as part of ongoing migration of EventTarget subclasses

workerdMerged#8167

Performance improvements to ts-streams implementation using injected arguments and fast properties mode

workerdMerged#8105

Migration of MessageChannel and MessagePort to TypeScript, preparing for EventTarget migration

workerdOpen#8270

TypeScript implementation of URLPattern

workerdOpen#8266

TypeScript implementation of URL

workerdOpen#8225

Serialization support for JavaScript classes

workerdOpen#8222

Moved email.h/c++ APIs to workerd

workerdDraft#8272

TypeScript port of DOMException

nodeDraft#67288lib / srcneeds-ci

Experimental implementation of green threads for Node.js, providing a lightweight worker alternative