facebook/hermes
A JavaScript engine optimized for running React Native.
Build with Backblaze B2
SDKs, agent skills, IDE extensions, and reference pipelines from Backblaze Labs. All open source.
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Where it stands
Rank, growth pace and release cadence relative to everything GStars tracks.
Ranks #500 of 2,845 repositories GStars tracks this week (top 18%).
No releases in the last 90 days; the most recent was 791 days ago, with 193 contributors on GitHub.
Peaked at #64 in the weekly ranking the week of Apr 19, its best in the past year.
Use Cases & Benefits
- Optimizes JavaScript execution specifically for React Native apps to enable faster start-up and efficient runtime performance.
- Delivers ahead-of-time static optimization and compact bytecode to reduce app launch time and memory usage compared to generic JS engines.
- Use for improving start-up speed and responsiveness in React Native mobile applications targeting iOS and Android platforms.
- Use for developers needing to build or customize a JavaScript engine integrated tightly with React Native for advanced performance tuning.
- Use for teams maintaining React Native apps requiring strict version alignment between Hermes and React Native to avoid runtime crashes.
Should you depend on it?
License terms, project hygiene and risks, from GitHub metadata and GStars' snapshots.
License
MIT
Permissive: commercial use, modification and redistribution are allowed with attribution.
Community files
- README: present
- Contributing guide: present
- Code of conduct: present
Watch-outs
No watch-outs from GStars' checks.
General guidance from repository metadata, not legal advice. How we score
From the README
Hermes is a JavaScript engine optimized for fast start-up of React Native apps. It features ahead-of-time static optimization and compact bytecode.
If you're only interested in using pre-built Hermes in a new or existing React Native app, you do not need to follow this guide or have direct access to the Hermes source. Instead, just follow these instructions to enable Hermes.
Noted that each Hermes release is aimed at a specific RN version. The rule of thumb is to always follow Hermes releases strictly. Version mismatch can result in instant crash of your apps in the worst case scenario.
If you want to know how to build and hack on Hermes directly, and/or integrate Hermes built from source into a React Native app then read on.
Hermes Blog - Technical articles and deep dives into Hermes internals.
Daily snapshots
Stars gained per day, and how forks and open issues moved, from GStars' daily snapshots
Forks
882+54
Open issues
276+50
Compared with peers in Frontend
Fastest-growing repositories GStars tracks in this cohort for the week of Oct 11, by 7-day star growth
| Repository | Stars | +7d | Health | Last release |
|---|---|---|---|---|
| heygen-com/hyperframes | 70.0K | +5.6K | 45 | today |
| vxcontrol/pentagi | 32.0K | +5.4K | 75 | 17 days ago |
| DuarteSantos8/openGym | 14.9K | +4.4K | 59 | 12 days ago |
| chthollyphile/folia-major | 8.9K | +3.0K | 75 | today |
| Leonxlnx/taste-skill | 101.1K | +2.2K | 75 | 2 days ago |
| facebook/hermes | 11.4K | +0 | 75 | 791 days ago |
| Category median | 32.0K | +4.4K | 75 | — |
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