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Release v0.8.0 for RN 0.65.x Β· facebook/hermes Β· GitHub
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v0.8.0 for RN 0.65.x
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This is a release candidate targeting the upcoming RN 0.65 release.
Highlighted Changes
- A new concurrent garbage collector "Hades", which delivered up to 30x shorter GC pause time on 64-bit device and 14x shorter on 32-bit devices. At Facebook, we saw this improve some CPU-intensive workloads by 20%-50%. You can learn more about Hades here.
- ECMAScript Internationalization API Specification (ECMA-402, or
Intl
) was a long asking features #23 (comment). 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! - Memory Improvements including SMI (Small Integer) and pointer compression that shrank the JavaScript heap by 30%
- Changes to
Function.prototype.toString
that fixed performance drop due to improper feature detection: #471 (comment)
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