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npm · #1518 most downloaded on npm
Flow types for the Flow-ESTree spec produced by the hermes parser
Last release 2 months ago
14 Jul 2026
Release timing varies
gaps range from 8 days to 3 months
Rarely documented
notes for 9 of 55 stable releases
Nothing withdrawn
no release was ever pulled
5 years old
55 releases · first in 2021
One column per quarter.
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This release corresponds to RN 0.75.
This release corresponds to RN 0.75.
This project publishes no release notes. Between v0.12.0 and v0.13.0 there were 250 commits, 250 of them substantive:
babel-plugin-syntax-hermes-parser with Babel 8 alpha (#1330)…and 230 more.
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This release comes with many bug fixes, language features (WeakRef & BigInt), and also the removal of the debugger on the command line tools. This mea
This release comes with many bug fixes, language features (WeakRef & BigInt), and also the removal of the debugger on the command line tools. This means much better performance when using Hermes from the CLI. In addition, RN now builds Hermes from source, so we no longer need to publish specific versions of Hermes to target a specific version of RN.
This project publishes no release notes. Between v0.11.0 and v0.12.0 there were 250 commits, 246 of them substantive:
hermes-eslint…and 226 more.
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In preparation for the 0.68.x, this release brings numerous bug fixes and performance improvements to Hermes.
In preparation for the 0.68.x, this release brings numerous bug fixes and performance improvements to Hermes.
This project publishes no release notes. Between v0.10.0 and v0.11.0 there were 95 commits, 91 of them substantive:
…and 71 more.
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In preparation for the release of RN0.67, this release brings numerous bug fixes and performance improvements to Hermes.
In preparation for the release of RN0.67, this release brings numerous bug fixes and performance improvements to Hermes.
This project publishes no release notes. Between v0.9.0 and v0.10.0 there were 250 commits, 246 of them substantive:
…and 226 more.
This release is primarily made to close the gap between the Hermes cut and the (upcoming) React Native 0.66 cut. Among the ~400 commits, we kept deliv
This release is primarily made to close the gap between the Hermes cut and the (upcoming) React Native 0.66 cut. Among the ~400 commits, we kept delivering memory and size wins, bugfixes, and made other progress behind the scene.
This project publishes no release notes. Between v0.8.0 and v0.9.0 there were 250 commits, 246 of them substantive:
…and 226 more.
This is a release candidate targeting the upcoming RN 0.65 release.
This is a release candidate targeting the upcoming RN 0.65 release.
Intl) was a long asking features https://github.com/facebook/hermes/issues/23#issuecomment-816126715. It is now built into Hermes on Android and enabled by default, with only 57-62K per API size overhead (compared to JSC's 6MiB). With this change, Hermes users no longer require locale polyfills. A big thank you to @mganandraj and other partners at Microsoft for driving the implementation to make this happen!Function.prototype.toString that fixed performance drop due to improper feature detection: https://github.com/facebook/hermes/issues/471#issuecomment-820123463This project publishes no release notes. Between v0.7.0 and v0.8.0 there were 250 commits, 240 of them substantive:
…and 220 more.
This is a pre-release targeting the upcoming RN 0.64 branch out. It bring ~150 commits of improvements, security and bug fixes, and supports for other
This is a pre-release targeting the upcoming RN 0.64 branch out. It bring ~150 commits of improvements, security and bug fixes, and supports for other mobile platforms and ARM64 thanks to the community.
From this version, Proxy and Reflect will be enabled by default 🎉 , after being an optional feature in two releases.
This project publishes no release notes. Between v0.6.0 and v0.7.0 there were 145 commits, 139 of them substantive:
isConstructorCall to true for matchAll…and 119 more.
This release brings ~350 commits worth of bugfixes and improvements, and is aimed at the upcoming 0.64 branch of React Native.
This release brings ~350 commits worth of bugfixes and improvements, and is aimed at the upcoming 0.64 branch of React Native.
Among them are correctness and performance fixes in regex, parsing improvements and native support for more JS features, a JS memory leak fix, and a new NPM that aims to help build React Native apps that target macOS instead of mobile. It also includes everything from patch release v0.5.1, notably, the unstripped Android libraries to help with native debugging and symbolication.
This project publishes no release notes. Between v0.5.0 and v0.6.0 there were 250 commits, 249 of them substantive:
…and 229 more.
Among the 200+ commits in this release, the most user visible change is the NPM size reduction from 140MB to 18MB unpacked. This will lead to snappier
Among the 200+ commits in this release, the most user visible change is the NPM size reduction from 140MB to 18MB unpacked. This will lead to snappier npm installs and project creation.
We're also publishing the new NPM hermes-engine-cli containing several host platform CLI tools for testing and development purposes, including a debugger and bytecode disassembler.
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