A React router library enabling the render-as-you-fetch concurrent UI pattern.
OverviewYarr is yet another React router library, but with a focus on enabling the render-as-you-fetch concurrent UI pattern by offering both component code preloading and data preloading. This behavior is enabled even without opt-in to React's experimental Concurrent Mode.
Yarr was originally developed for use with Relay (formally Relay Modern) in September 2020 for internal use at Contra. It's since been open-sourced to give back to the community and promote Relay adoption.