It looks like they were originally on Chakra (the JS engine used by IE9+ and pre-Chromium Edge) but added support for Hermes in 2021 or so and removed support for Chakra last year, so Hermes is now the only option. Edge moved to Chromium in 2019, so this means they actually kept Chakra around for a few years just? for React Native on Windows.
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https://github.com/microsoft/react-native-windows/discussion... https://github.com/microsoft/react-native-windows/pull/15371 https://github.com/search?q=repo%3Amicrosoft%2Freact-native-...
It looks like they were originally on Chakra (the JS engine used by IE9+ and pre-Chromium Edge) but added support for Hermes in 2021 or so and removed support for Chakra last year, so Hermes is now the only option. Edge moved to Chromium in 2019, so this means they actually kept Chakra around for a few years just? for React Native on Windows.