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## Summary
Dependency maintenance for the Rust compiler crates.
### Fast Refresh hash: sha2 + hmac → hmac-sha256
The Fast Refresh source hash (`enableResetCacheOnSourceFileChanges`)
only needs an HMAC-SHA256 of the source text, matching the TS compiler's
`createHmac('sha256', code).digest('hex')`. RustCrypto's `sha2` + `hmac`
pulled in **11 crates** (`sha2`, `hmac`, `digest`, `block-buffer`,
`typenum`, `crypto-common`, `hybrid-array`, `const-oid`, `cpufeatures`,
`cmov`, `ctutils`) — generic-hashing / constant-time machinery that is
irrelevant for a non-security content fingerprint. This replaces them
with the single **zero-dependency** `hmac-sha256` crate: a net reduction
of **10 crates**.
HMAC-SHA256 is a standardized deterministic algorithm, so the emitted
hash is unchanged. A new unit test
`source_file_hash_matches_node_create_hmac` pins the result against
Node's `createHmac('sha256', code).digest('hex')` for several inputs.
### Other bumps
- `napi` / `napi-derive` 2 → 3
- `similar` 2 → 3 (dev-dependency)
- Drop the unused `react_compiler_lowering` dependency from
`react_compiler_ssa`
`cargo check --workspace --all-targets` passes, including the napi 3
native crate.
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.