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Roact is a declarative Lua UI library similar to Facebook's React. It exposes a very similar API and implements nearly identical semantics.

This documentation is based on the structure of React's documentation, but is a work in progress. Many things from React also apply to Roact, but if you find anything missing or incorrect, open an issue on GitHub!

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This documentation assumes some familiarity with Lua. If you're new to Lua, Programming in Lua by Roberto Ierusalimschy is a good introduction, and the first edition (for Lua 5.0) is available online for free.