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Remove `tryRecord()` from the compilation pipeline now that all passes record errors directly via `env.recordError()` / `env.recordErrors()`. A single catch-all try/catch in Program.ts provides the safety net for any pass that incorrectly throws instead of recording. Key changes: - Remove all ~64 `env.tryRecord()` wrappers in Pipeline.ts - Delete `tryRecord()` method from Environment.ts - Add `CompileUnexpectedThrow` logger event so thrown errors are detectable - Log `CompileUnexpectedThrow` in Program.ts catch-all for non-invariant throws - Fail snap tests on `CompileUnexpectedThrow` to surface pass bugs in dev - Convert throwTodo/throwDiagnostic calls in HIRBuilder (fbt, this), CodegenReactiveFunction (for-in/for-of), and BuildReactiveFunction to record errors or use invariants as appropriate - Remove try/catch from BuildHIR's lower() since inner throws are now recorded - CollectOptionalChainDependencies: return null instead of throwing on unsupported optional chain patterns (graceful optimization skip) --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/35881). * #35888 * #35884 * #35883 * #35882 * __->__ #35881
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.