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It's called Hard Fork.
According to Facebook, Relay “coalesces queries into batches for efficiency, manages error-prone asynchronous logic, caches data for performance, and automatically updates views as data changes.” The company has demonstrated how it can be used for crafting components like news feeds.
Relay’s first public release includes its core framework modified for use outside of Facebook’s development environment. The company says it’s working to add more features, include offline support and real-time updates.