Rob Palmer
@robpalmer2
JavaScript Infrastructure & Tooling at Bloomberg. Co-chairing @TC39. Likely to tweet tech stuff about JS & software performance. Opinions are my own.
ECMAScript excitement 😉 Congrats to @magic_akari & @kdy1dev on shipping parsing support for TC39 Stage 3 `import defer` in SWC 🎉 import defer * as ns from "mod" This feature improves performance via lazy evaluation of (eagerly fetched) modules 👍 github.com/swc-project/sw…
TypeScript 5.9 RC is available to try! Let us know how it works before next week's stable release! devblogs.microsoft.com/typescript/ann…
new React Compiler docs have landed! thank you everyone for the feedback.
i'm rewriting all of the React Compiler docs: github.com/reactjs/react.…. would love feedback from the community!
Hermes v2 ("static_h" branch) performance at end of June 2025, relative to Hermes and QuickJS. Numbers are relative to QuickJS (1.2 means 1.2x faster); higher is better.
I am a big fan of JS runtimes shooting promo videos. The "Announcing Deno 2" ad was great. We need one for Node too!
filming for Bun v1.3 next week
Explicit Compile Hints in @rolldown_rs, for the record. github.com/rolldown/rolld…
#Formula1 race strategist, analyst & commentator @RuthBuscombe visited our London office today to share with our engineers how data-driven decisions shape #F1 races, just as the systems they build help our clients extract insights from complex, fast-moving financial data
With #MCP, @Bloomberg isn’t just modernizing its own #GenAI infrastructure — it’s accelerating how financial intelligence is delivered & empowering financial professionals with smarter, faster, #AI-powered tools in a rapidly evolving industry bloom.bg/44KO7Er
Analyzing trends from financial documents over a long horizon for companies/sectors is a challenging task. Checkout out our proposed solution at arxiv.org/abs/2507.07906, presented at @SIGIRConf workshop on finance in IR @kingsaintrb @geoffreygunow #SIGIR2025
Researchers and engineers from @Bloomberg's #AI Engineering group co-authored 3 papers at #SIGIR2025 & helped co-organize the #FinIR workshop; learn more about their research & how their work will advance the state-of-the-art in #informationretrieval bloom.bg/44wckje (1/2)
This quiz uses V8's Date parser to demonstrate that the JS Date spec is unintuitive in many ways. Thankfully work has been underway to fix this for several years 👍 Temporal is the replacement for the Date API. It shipped in Firefox 127 in May 2025 🚀 developer.mozilla.org/en-US/docs/Web…
I made a quiz about the JS Date parser is. It's very easy and you will score very high. jsdate.wtf
Do you know you can use NODE_DEBUG=MODULE_TIMER to measure module startup on Node.js?