src/workerd/api/node/

C++ implementations of Node.js built-in modules. Each module = JSG-bound class registered via NODEJS_MODULES(V) macro in node.h. TypeScript counterpart lives in src/node/.

BUILD TARGETS

• node-core: buffer, dns, i18n, sqlite, url. No //src/workerd/io dep — do not add one. Depends on Rust crates (cxx-integration, dns, net), ada-url, nbytes, simdutf.
• node: async-hooks, crypto, diagnostics-channel, module, process, timers, util, zlib-util. Depends on io, ncrypto, zstd, kj-brotli. Depends on node-core.
• exceptions: Standalone Node.js exception types; dep of node-core.

MODULE REGISTRATION

1. Add JSG_RESOURCE_TYPE class in <module>.h + <module>.c++
2. Define EW_NODE_<MODULE>_ISOLATE_TYPES macro in header
3. Add V(ClassName, "node-internal:<name>") to NODEJS_MODULES(V) in node.h (or NODEJS_MODULES_EXPERIMENTAL(V) for staging)
4. Append to EW_NODE_ISOLATE_TYPES at bottom of node.h
5. Per-module compat flags gated in registerNodeJsCompatModules() — add isNode*Module() + featureFlags.getEnable*() check
6. DnsUtil special-cased: C++ fallback when RUST_BACKED_NODE_DNS autogate disabled

TESTING

Tests in tests/. Naming: <module>-test.js + <module>-test.wd-test; -nodejs- infix when needing compat flags. All tests set compatibilityFlags = ["nodejs_compat", "nodejs_compat_v2", "experimental"]. Network tests (net, tls, http) use sidecar js_binary targets. fixtures/ has 46 PEM files for crypto. process-stdio tests use sh_test with .expected_stdout/.expected_stderr. C++ unit test: buffer-test.c++ via kj_test.