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npm · #1521 most downloaded on npm
A JavaScript parser built from the Hermes engine
Last release 2 months ago
14 Jul 2026
Release timing varies
gaps range from 8 days to 3 months
Nearly every release is documented
notes for 57 of the last 60 stable releases
1 version withdrawn
withdrawn after publishing
6 years old
64 releases · first in 2021
One column per quarter.
Nothing published for this version
This release fixes a memory leak related to WeakMaps. It's a drop-in replacement for v0.4.0 in react-native 0.62.0.
This release fixes a memory leak related to WeakMaps. It's a drop-in replacement for v0.4.0 in react-native 0.62.0.
This release includes an implementation of Proxy and Reflect, but it is not enabled by default. To enable it for the command line tools, pass the -Xes
This release includes an implementation of Proxy and Reflect, but it is not enabled by default. To enable it for the command line tools, pass the -Xes6-proxy flag, such as hermes -Xes6-proxy. Proxy will be enabled in a future release of React Native.
The 0.4.0 release is not compatible with RN 0.61.
This release also includes a number of other performance enhancements, bug fixes, and memory savings in the engine.
This release is primarily to publish breaking source changes for integration with the next version of React Native. It is not compatible with existing
This release is primarily to publish breaking source changes for integration with the next version of React Native. It is not compatible with existing builds of React Native, up to and including 0.61.4. Please wait for the next React Native release before trying out Hermes v0.3.0!
As always there are many bug fixes and performance improvements, including faster string concatenation and native support for ES6 spread operators.
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