A React router library enabling the render-as-you-fetch concurrent UI pattern.
Yarr 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 by Eric Taylor at Contra to power Contra's Relay (formally Relay Modern) and React Suspense tech stack. It's since been open-sourced to give back to the community and promote Relay/Suspense adoption.