Hermes Engine

I'm an open source JavaScript Engine by Facebook optimized for React Native 🤘

[React Native @reactnative]

With the 0.70 release branch cut, we are excited to announce that @HermesEngine is now the default engine on Android and iOS for 0.70+

Here’s an overview of why we made the switch and all the exciting new changes the community can expect:

https://t.co/tRsd8jd0nd

[React Native @reactnative]

With community adoption and feedback, @HermesEngine has flourished.

Today, we’d like to share all the progress we’ve made and the case for making Hermes the default engine for React Native.

https://t.co/P9mIe8f6KH

[Tzvetan Mikov @tmikov]

We have a PR to enable Intl in Hermes. It is some binary increase, but not a lot, about 3% (precise numbers in the PR). https://t.co/n3vs8wIALf

Should we just enable it, or should we maintain two separate builds with all the associate complexity.

[Tzvetan Mikov @tmikov]

As of yesterday, Hermes supports logical assignment operators: ||=, &&= and ??=. It ended up a fairly small change - the tests are larger than the actual code.
https://t.co/hzgdfBH98n

#javascript

[Tzvetan Mikov @tmikov]

A major milestone: Hermes can now parse the entirety of Facebook's JavaScript codebase, both for web and RN, including all ES6+ features, JSX and Flow type annotations, no Babel or any preprocessing. A single server VM with 24 workers parses 450MB/s. (1 of 3)

[Tzvetan Mikov @tmikov]

For the next Hermes release, we have decreased the installed npm size from 120MB to 18MB!

https://t.co/w593aQc1lW

[Hermes Engine @HermesEngine]

We have recently added ES6 Proxy support to Hermes. Help us test it in your React Native 0.62 based app with npm install [email protected] and let us know!

[Tzvetan Mikov @tmikov]

Cross-compilation of Hermes to Wasm/Asm.js has finally landed on Github (for many months it was just a local experiment on my laptop)! Now anyone can compile and run Hermes in Node.js or in a browser... A NPM with a packaged Wasm/Asm.js build will follow soon.

[Tzvetan Mikov @tmikov]

We just landed another 5% memory win in Hermes https://t.co/j4BQ5fU8UA .

It is a design change that was planned a little more than a year ago. More are coming.

[Tzvetan Mikov @tmikov]

The Hermes JS Engine team has been working hard to improve memory usage. Since July we have decreased our RAM footprint by more than 30% and there are yet more significant savings to come!

#hermesengine #javascript #ReactNative

[React Native at Microsoft @ReactNativeMSFT]

📢 #ReactNative for Windows Milestone 3 is out now! 📢 Milestone 3 includes support for RN version 0.60, native extensions developer story, integration with the high performance Hermes JS engine, E2E test infra and more! https://t.co/9DDJpaxD7M

[Tzvetan Mikov @tmikov]

We just landed nullish coalescing and optional chaining in Hermes: https://t.co/woQ8Jhm7rg! Just in time for the TC39 meeting :-)

#hermesengine #javascript #ReactNative

[Hermes Engine @HermesEngine]

@AndrewDurber @nparashuram @ChainReactConf lets see if we can't make this faster, who's with me

[Hermes Engine @HermesEngine]

@kudochien takes a village to build stuff :)

[Hermes Engine @HermesEngine]

@KarniejP @kudochien @cnakazawa team of great engineers and partners that helped make this possible. If there is something we can do better, please tell us!

[Hermes Engine @HermesEngine]

@Vardiak https://t.co/jw7AlEhJBf

[Hermes Engine @HermesEngine]

Now that I'm released, if we were to do some videos with engineers, what types of questions you like answered.

[Hermes Engine @HermesEngine]

@Matt_Christians

[Hermes Engine @HermesEngine]

@DaniAkashS

[Hermes Engine @HermesEngine]

@NicoAudy we like a bit more targeted approach with 🔥

[Hermes Engine @HermesEngine]

Hello world, can't wait to show you what i'm capable of. I'm open source too :)

[Joel Marcey @JoelMarcey]

ICYMI (or just a reminder)....

@fbOpenSource released Hermes, a JavaScript engine for Android, optimized for @reactnative.

Here is the key info:

Docs: https://t.co/Vu7fRytbQP

Twitter: @HermesEngine

GitHub: https://t.co/DNzL6DJkFy

Talk: https://t.co/uFsTLPEuIi