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Valentin Shergin
6a1438c044
Summary: `Element` is an abstraction layer that allows describing component hierarchy in a declarative way. Creating `Element`s themself does not create a component tree (aka `ShadowNode` tree) but describes some hierarchical structure that might be used to build an actual component tree (similar to XML Elements). `Element<>` provides some basic type-safety guarantees: all modifications of element objects require using objects (such as Props or State) of compatible type. For now, the only useful application of that is building tests. Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D19512392 fbshipit-source-id: eb0711c2a537865fa5454dbede53412a135058cf