Sathya Gunasekaran
@_gsathya
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Building @reactjs compiler @meta ; formerly: @v8js @google
London
Joined April 2009
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📢 I just shipped Promise.allSettled in Chrome 76 🔥
More info:
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✨ I wrote up a straw man for adding a slice notation to ECMAScript:
Feedback welcome!
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📢 I just shipped Numeric separators in Chrome 75! 🔥
More info:
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⚛️ I start on the React core team next week! ✨
Super excited to be back hacking on compilers and JavaScript, but most importantly looking forward to working alongside my super smart team mates!
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🚀🔥 Object rest/spread properties has landed in V8 behind a flag!
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I just staged public class fields behind the 'Experimental JavaScript' flag in latest Chrome canary 🎉
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w00t I've got private class fields working locally in V8
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I just staged private class fields behind the 'Experimental JavaScript' flag in the latest Chrome Canary 🎉
Please try it out and file bugs here:
Spec:
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6 years ago, back when I was in school, I saw my first Google I/O talk about
@v8js
by
@expatdanno
.
Today,
@mathias
and I, talked about
@v8js
at Google I/O!
Check out our talk here:
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the react compiler's type system was built to improve memoization but it turned out to be useful for lots of other analyses too!
📝 I wrote about how the type system works here:
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📝 Curious about the React Compiler? I wrote about one of the core compiler transformations:
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📢 Chrome 72 will be shipping with the new `export * as ns from "mod"` module syntax! 🔥
Chrome Canary 72.0.3584+ already has it! 👀✨
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WeakRefs are now stage 3!!✨🚀
More info:
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I'm presenting my slice notation proposal this week at TC39. Let's see how this goes 🙌
More info:
Pretty packed agenda for TC39 this week. The agenda gives you a view into what TC39 is actively working on. Agenda items link to repositories which are great places to give feedback about anything about a proposal. See the slides to learn about proposals.
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I refactored
@ChromiumDev
's async key/val storage implementation () to use the new private fields syntax as an example here:
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I just shipped Array.prototype.values in Chrome 66 🎉
Chrome is trying to ship this for the third time! We had to unship it because of web compat issues. There's no way to know if apps are still broken, so please file an issue here if there's any problem:
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Almost done implementing Promise.prototype.finally in V8
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engineering at google:
2 weeks: prototype an idea
next 2 quarters: write design docs, suffer analysis paralysis, make ppts, attend meetings, write OKRs, build consensus, write tons of tiny CLs, write more design docs, attend cross org/geo meetings, ship idea, write perf, CME
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Just added better error messages for destructuring in V8
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lol Preact is so fast on the speedometer benchmark that the jit never kicks in
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Oh yeah, it'd be really cool if TypeScript could implement Flow's render types!
It's a shame TypeScript can't *require* a specific kind of React component as children of another. It would make composibility libraries so much more powerful.
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I just shipped optional catch binding in Chrome 66 🛳️🚀
Thanks to
@bakkoting
for the implementation work!
Proposal:
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I wrote about the work we've been doing on improving the Internationalization API in
@v8js
:)
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After 4 years, Array.prototype.values is finally web compatible:
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A good compiler tells you good error messages. A better compiler will tell you to eat breakfast
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I still remember when we shipped ESM, the Blink folks did a bunch of work but couldn't make it fast enough and just recommended bundling in the end
Been there. Done that. Straight up does not work. In HTTP2 the per-request overhead is still very substantial and there are concurrency limits, plus you get waterfalls and inefficient compression.
There is no way around bundling for high performance websites today.
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undefined is not a function
What five words best describe programming?
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I'll be talking about how the React programming model makes React Forget possible!
Join
@_gsathya
for his keynote: "Statically analysing react components for fun and profit".
Go deep into React's programming model and discover why it's a goldmine for compilers and static analysis.
#ReactIndia2023
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I'm actually working on decreasing the memory size for these right now:
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oxc is kinda neat
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Landed a bug in
@v8js
that dropped objects randomly from a Map/Set, if a property was deleted from one of these objects.
Took forever to debug and libraries had to work around with a Chrome version check 😅
a Chrome version 62 check is my web legacy
I would love to hear stories from senior+ engineers who pushed fuck ups to prod to know I’m not crazy for feeling some type of way to be told my code quality is poor due to code pushed to prod that I quickly fixed when I found the issues . Just wanna know if this is something…
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There was a question on r/reactjs recently about why it's taking a while to build React Forget, I wrote a reply explaining _one_ of the challenges:
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If you're using Date.prototype.toLocaleString, please look into using Intl.DateTimeFormat instead for better performance.
Here's a real world example of such a change:
And as always, measure your improvements.
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Wonder if the frontend tooling ecosystem will move back to JS with Static Hermes
We wanted to show the performance and the insane power of the Static Hermes native FFI. But we don't yet support the all language features needed to compile React Native (soon though!), so we improvised.
We imported the bindings for DearImGui (a popular C++ imperative game UI…
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why do JavaScript features take a long time to get standardised in tc39?
@bakkoting
explains it so well here:
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import() is shipping in all the browsers but will probably never be part of the ECMAScript thanks to
@TC39
committee politics 😞
@littledan
@mikesherov
Blockers are committee politics, which are not worth fighting given that import() is shipping in all browsers, fully test262 tested, and mandated to be implemented by the
@htmlstandard
.
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the latest on the cool stuff we're working on, including an update on the React compiler!
In React Labs posts, we write about projects in active research and development. Since our last update, we’ve made significant progress on our long-term projects, and we’d like to share what we’ve learned.
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Hopefully, the new Intl.RelativeTimeFormat proposal will help shave off more of the bundle size:
Working with dates in JavaScript? Try . Shaved 50%+ off my bundle replacing Moment.js + locales with it. For more info see ✨
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I'm giving a talk at Google I/O with
@mathias
about the latest JavaScript features in V8!
🔥 Google I/O features not one but *two*
@v8js
presentations!
@mathias
and
@_gsathya
talk about modern JavaScript features and optimizations:
@ThomasTheDane
covers what you can create with WebAssembly:
See you there!
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it's interesting that Forget probably can't exist without hooks
`this` is just too hard for a compiler to reason about
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Curious if folks know why there's a difference in performance here?
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working on a high performance compiler has led me to some bad coding practices
- micro optimization is awesome
- clusterfuzz writes my tests
- write comments that describe literally what the code does
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Wow never thought I'd actually break down in the office
new life lesson learnt
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Randomly met up with a redittor from a London subreddit and they turned out to be a Facebook engineer working on a JavaScript VM 🤣 👌
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js in 2010 was all about peak perf
js in 2020 is all about that baseline perf
@andywingo
MIR building is faster, but more importantly: TI only helped code running in Ion, it made other tiers and VM code slower (recording property types etc). OK for micro-benchmarks but terrible trade-off for the modern web (massive amounts of cold-ish code).
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class X {
static ['x'] = function() { return 1; };
static ['x']() { return 2;}
}
console.log(X.x()); // prints 1 ... 🙃
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life at goog has made me realize some imp priorities at new job
✅ scored a 3 letter username
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Wearing my Firefox shirt in honor of the new quantum release. Go web!
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tired: auto memoizing compiler
wired: auto reactivity compiler
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"Our real world app is 32% faster, but this synthetic benchmark is 38% slower so turbofan is slow." 🤔
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It's interesting to see how my views on evaluating language features have completely changed, influenced by seeing V8 optimize for startup performance.
Performance at the baseline tier (and not the JIT) is my yardstick now.
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