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`invariant()` was a pain to use - we always record a single location, but the API required passing a compiler detail. This PR replaces `invariant()` (keeping the name) with `simpleInvariant()`s signature, and updates call sites accordingly. I've noticed that agents consistently get invariant() wrong, which aligns with it being tedious to call when you're writing code by hand. The simplified API should help a bit.
React Compiler
React Compiler is a compiler that optimizes React applications, ensuring that only the minimal parts of components and hooks will re-render when state changes. The compiler also validates that components and hooks follow the Rules of React.
More information about the design and architecture of the compiler are covered in the Design Goals.
More information about developing the compiler itself is covered in the Development Guide.