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Included review availability: Your plan provides up to 5 included reviews per hour; 2 remain after this review. WalkthroughThe change removes unused workspace dependencies and narrows uSockets, QUIC, uWebSockets, JSC, writer, tracing, and FFI interfaces. It also adds regression coverage for custom ChangesAPI and dependency cleanup
Suggested reviewers: Merge Risk: 🔵 Low · up to The PR removes unused networking, FFI, and dependency code while preserving the exercised behavior; the remaining bounded risk is that the new require.extensions regression test may misclassify benign debug or ASAN stderr as a failure. The PR is mergeable with explicit owner awareness or follow-up. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@test/js/node/module/require-extensions.test.ts`:
- Line 208: Update the stderr assertion in the affected test to avoid requiring
an exactly empty raw stderr value; trim incidental whitespace before checking
emptiness, or remove the assertion if stderr is not part of the test contract.
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Cargo.tomlpackages/bun-usockets/src/context.cpackages/bun-usockets/src/crypto/openssl.cpackages/bun-usockets/src/crypto/sni_tree.cpppackages/bun-usockets/src/fault_inject.cpackages/bun-usockets/src/internal/fault_inject.hpackages/bun-usockets/src/internal/internal.hpackages/bun-usockets/src/internal/networking/bsd.hpackages/bun-usockets/src/libusockets.hpackages/bun-usockets/src/loop.cpackages/bun-usockets/src/node_quic_shim.cpackages/bun-usockets/src/quic.cpackages/bun-usockets/src/quic.hpackages/bun-usockets/src/socket.cpackages/bun-uws/src/App.hpackages/bun-uws/src/AsyncSocket.hpackages/bun-uws/src/AsyncSocketData.hpackages/bun-uws/src/Http3App.hpackages/bun-uws/src/Http3Request.hpackages/bun-uws/src/Http3Response.hpackages/bun-uws/src/Http3ResponseData.hpackages/bun-uws/src/HttpContextData.hpackages/bun-uws/src/HttpParser.hpackages/bun-uws/src/HttpResponse.hpackages/bun-uws/src/Loop.hpackages/bun-uws/src/LoopData.hpackages/bun-uws/src/QueryParser.hpackages/bun-uws/src/WebSocket.hpackages/bun-uws/src/WebSocketProtocol.hsrc/bun_core/util.rssrc/bundler/Cargo.tomlsrc/bunfig/Cargo.tomlsrc/collections/Cargo.tomlsrc/crash_handler/Cargo.tomlsrc/css/Cargo.tomlsrc/http/Cargo.tomlsrc/http/h3_client/ClientContext.rssrc/ini/Cargo.tomlsrc/install/Cargo.tomlsrc/io/Cargo.tomlsrc/js_printer/Cargo.tomlsrc/js_printer/lib.rssrc/jsc/Cargo.tomlsrc/jsc/NodeModuleModule.rssrc/jsc/TopExceptionScope.rssrc/jsc/bindings/JSCommonJSExtensions.cppsrc/jsc/bindings/JSCommonJSExtensions.hsrc/jsc/bindings/TopExceptionScopeBinding.cppsrc/jsc/bindings/linux_perf_tracing.cppsrc/libuv_sys/Cargo.tomlsrc/lsquic_sys/lib.rssrc/platform/Cargo.tomlsrc/ptr/Cargo.tomlsrc/uws_sys/quic/Context.rstest/js/node/module/require-extensions.test.ts
💤 Files with no reviewable changes (47)
- src/http/Cargo.toml
- src/crash_handler/Cargo.toml
- src/jsc/bindings/linux_perf_tracing.cpp
- packages/bun-uws/src/Http3Response.h
- src/jsc/Cargo.toml
- src/bundler/Cargo.toml
- src/ptr/Cargo.toml
- packages/bun-uws/src/LoopData.h
- src/bunfig/Cargo.toml
- src/libuv_sys/Cargo.toml
- src/css/Cargo.toml
- packages/bun-uws/src/HttpParser.h
- packages/bun-uws/src/AsyncSocketData.h
- packages/bun-usockets/src/socket.c
- src/ini/Cargo.toml
- packages/bun-usockets/src/internal/fault_inject.h
- packages/bun-usockets/src/loop.c
- packages/bun-usockets/src/crypto/openssl.c
- src/bun_core/util.rs
- packages/bun-uws/src/HttpResponse.h
- src/jsc/bindings/TopExceptionScopeBinding.cpp
- packages/bun-usockets/src/fault_inject.c
- packages/bun-uws/src/HttpContextData.h
- packages/bun-usockets/src/context.c
- packages/bun-usockets/src/internal/internal.h
- packages/bun-uws/src/QueryParser.h
- src/js_printer/Cargo.toml
- src/lsquic_sys/lib.rs
- packages/bun-usockets/src/internal/networking/bsd.h
- packages/bun-usockets/src/node_quic_shim.c
- packages/bun-uws/src/WebSocket.h
- src/platform/Cargo.toml
- packages/bun-uws/src/Http3App.h
- packages/bun-uws/src/Http3ResponseData.h
- src/jsc/bindings/JSCommonJSExtensions.h
- packages/bun-usockets/src/crypto/sni_tree.cpp
- src/install/Cargo.toml
- src/io/Cargo.toml
- Cargo.toml
- packages/bun-uws/src/AsyncSocket.h
- src/js_printer/lib.rs
- src/collections/Cargo.toml
- src/jsc/bindings/JSCommonJSExtensions.cpp
- packages/bun-uws/src/App.h
- packages/bun-uws/src/WebSocketProtocol.h
- src/jsc/NodeModuleModule.rs
- packages/bun-usockets/src/libusockets.h
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Updated 1:35 PM PT - Aug 27th, 2026
❌ @robobun, your commit 5bf7b50 has 2 failures in
🧪 To try this PR locally: bunx bun-pr 40294That installs a local version of the PR into your bun-40294 --bun |
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All four prior nits (LoopData.h includes, NodeModuleModule.rs comment, Socket.rs on_open doc, libuwsockets.cpp addressAsText reference) are addressed as of 0e6e406, and this pass found no bugs. Given the scope — 59 files across bun-uws/bun-usockets, the QUIC connect FFI signature, and the JSCommonJSExtensions GC visitor — a human sign-off is still worthwhile.
What was reviewed:
- JSCommonJSExtensions: confirmed
m_registeredFunctionswas never populated (the three__appendFunction/__setFunction/__swapRemoveFFI entry points had zero Rust callers), so droppingvisitChildrenremoves an always-empty visitor;CustomLoader::Custom(Strong)was already the sole root, and the new GC test pins that. us_quic_socket_context_connect: the droppeduserparam's only reader was the removedus_quic_pending_connect_user; the sole Rust caller inClientContext::connectis updated in lockstep.Loop::defer/wakeupCb: nothing ever enqueued intodeferQueues, so the drain was a no-op;wakeupCbcorrectly stays as a stub sinceus_create_loopcalls it unconditionally.App::missingServerName/removeServerName: Bun's SNI path goes throughus_listen_socket_on_server_namefrom Rust (ListenSocket.rs), not the App-level handler;us_listen_socket_remove_server_nameitself is kept.
Extended reasoning...
Overview
Scheduled dead-code sweep: -641 source lines across 59 files. Four independent buckets — uninstantiated uWS C++ template methods, unreferenced usockets C functions and prototypes, four unused Rust↔C++ FFI bindings (JSCommonJSExtensions registry, TopExceptionScope::clear_exception, Bun__linux_trace_close, us_nq_spec_peer_ctx), the WriterContext::flush default and its overrides, and 23 unused Cargo dependency edges. One FFI signature narrows (us_quic_socket_context_connect drops its unread user out-param) with its sole caller updated. A new subprocess test pins that custom require.extensions handlers survive Bun.gc(true), get replaced on reassignment, and fall back to .js on delete.
Security risks
None identified. The SNI-adjacent removals (us_listen_socket_find_server_name_userdata/_ctx, App::missingServerName) were reachable only from the removed onMissingServerName App path; Bun's live SNI resolver (us_listen_socket_on_server_name set from ListenSocket.rs) is untouched. No validation, auth, or crypto logic changes.
Level of scrutiny
High, because of breadth: the diff spans the HTTP/1 server, HTTP/3 server and client, WebSocket protocol parser, QUIC transport, and a JSC class's GC machinery. Each individual removal is mechanically verifiable (compile + rg for callers), and the PR description documents per-symbol rg sweeps, a 12-target rust:check-all, and targeted test runs — but the aggregate surface across critical subsystems is large enough that a maintainer should confirm nothing on the "left alone on purpose" list was accidentally swept.
Other factors
Four review iterations already ran on this PR; each raised only stale-comment/include nits, all fixed in follow-up commits (cd8ebbe, 9a08fff, 0e6e406). The bug-hunting pass on the current head found nothing. The one change that reads as GC-sensitive — dropping JSCommonJSExtensions::visitChildren — is safe because the vector it visited was never populated (its three FFI writers had zero Rust callers), and the added test confirms the Strong-rooted handler survives GC on both main and the PR branch. Deferring solely on scope, not on any open concern.
This was referenced Aug 24, 2026
alii
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…sc JSC bindings (#40413) ### Problem - Four Rust host exports have no C++ caller: `Bun__WebSocketClient__writeBlob`, `Bun__WebSocketClientTLS__writeBlob`, `Bun__WebSocketClientTLS__initWithTunnel`, and `Bun__internal_drainTimers`. `WebSocket.cpp` converts a Blob to bytes itself and calls `writeBinaryData`, and the tunnel path only creates the non-TLS client. The `HOST_EXPORT` marker roots each of them, so neither rustc nor hawk can see that they are dead. - A handful of C++ methods are declared and defined but never called: `HTTPParser::lessThan`, one `JSNodePerformanceHooksHistogram::create` overload, `JSAbortAlgorithm::callbackData` and `toJS(AbortAlgorithm&)`, `JSPerformance::toWrapped`, `JSCStackFrame::typeName`, `root(CryptoKey*)`, the `String` overload of `throwNodeRangeError`, and 16 ncrypto helpers. - Two `pub` Rust items have no caller in any crate: `bun_base64::simdutf_encode_url_safe_alloc` and `CowSliceZ::init_unchecked`. ### Fix - Delete the items above. `WebSocketClient::write_blob` goes with its exports. `encode_append_impl` folds into `encode_append`, its only remaining caller. The ncrypto `Ec` class keeps its one live member, `GetCurveIdFromName`. - Every deletion is confirmed two ways: `rg` over `src/`, `build/debug/codegen/`, `src/codegen/`, `packages/`, and `vendor/WebKit` finds no reference, and a `bun-debug` relink with `--gc-sections --print-gc-sections` discards each symbol. `host_fn_this_value` and `root(MessagePort*)` looked the same way and stay: codegen emits the first, and #39841 is editing `MessagePort.cpp`, so the second waits for that fix to land. - New source lint `test/internal/source-lints/host-export-callers.test.ts`: every `c`/`jsc` `HOST_EXPORT` marker must be named by a C or C++ source. It fails on main with exactly the four exports above and passes here. - Verified: `bun bd` builds, `bun run rust:check-all` passes on all 12 targets, `clang-format` and `cargo fmt` are clean. Ran `test/js/web/websocket/` (blob, client, bidir proxy), `test/js/node/crypto/` (crypto, ecdh, hmac, sign, x509), `node-http`, `node-http-parser`, `perf_hooks`, and `abort`. ### Background - `// HOST_EXPORT(Name, c)` marks a Rust fn that `src/codegen/generate-host-exports.ts` wraps in an `extern "C"` thunk for C++. The thunk exists whether or not C++ calls it, so an orphaned export compiles without a warning. - ncrypto (`src/jsc/bindings/ncrypto.{cpp,h}`) is Bun's copy of Node's OpenSSL helper layer. Node still uses the removed helpers; Bun's callers never did. - The linker check: a debug link with `-Wl,--gc-sections -Wl,--print-gc-sections` lists every function section nothing references. A function that is discarded and also absent from the linked binary has no caller on that platform. Platform-gated code then needs a source check, which is why the darwin-only `Bun__noOrphans_*` and the Windows-only `windowsEnv` builtin stay. <details><summary>Notes</summary> Removed, by file: - `src/http_jsc/websocket_client.rs`: `bun__websocketclient__write_blob`, `bun__websocketclienttls__write_blob`, `bun__websocketclienttls__init_with_tunnel`, `WebSocketClient::write_blob`, and the now unused `JSValue` import. - `src/runtime/timer/Timer.rs`: `drain_timers_export` (`Bun__internal_drainTimers`). - `src/base64/lib.rs`: `simdutf_encode_url_safe_alloc`; `encode_append_impl` folded into `encode_append`. - `src/ptr/CowSlice.rs`: `CowSliceZ::init_unchecked`. - `src/jsc/bindings/node/http/NodeHTTPParser.{cpp,h}`: `HTTPParser::lessThan`. - `src/jsc/bindings/JSNodePerformanceHooksHistogram.{cpp,h}`: `create(VM&, Structure*, JSGlobalObject*, HistogramData&&)`. - `src/jsc/bindings/webcore/JSAbortAlgorithm.{cpp,h}`: `callbackData()`, `toJS(AbortAlgorithm&)`, `toJS(AbortAlgorithm*)`. - `src/jsc/bindings/webcore/JSPerformance.{cpp,h}`: `JSPerformance::toWrapped`. - `src/jsc/bindings/ErrorStackTrace.{cpp,h}`: `JSCStackFrame::typeName`, `retrieveTypeName`, `m_typeName`. - `src/jsc/bindings/webcrypto/CryptoKey.{cpp,h}`: `root(CryptoKey*)` and the `WebCoreOpaqueRoot` forward declaration and include it needed. - `src/jsc/bindings/webcore/JSDOMOperation.{cpp,h}`: `throwNodeRangeError(JSGlobalObject*, ThrowScope&, const String&)`; every caller passes an `ASCIILiteral`. - `src/jsc/bindings/ncrypto.{cpp,h}`: `CryptoErrorList::add`, `CryptoErrorList::pop_front`, `BignumPointer::encode`, `BignumPointer::encodeInto`, `X509View::clone`, `BIOPointer::New(const BIO_METHOD*)`, `BIOPointer::Write`, `EVPKeyPointer::bits`, `Cipher::EMPTY`, `ECKeyPointer::New(const EC_GROUP*)`, `EVPKeyCtxPointer::derive`, `HMACCtxPointer::digest`, `Ec::Ec()`, `Ec::Ec(const EC_KEY*)`, `Ec::getGroup`, and the `Ec` conversion operators and field. Scan summary for this run. Areas: Rust in `src/runtime`, `src/http_jsc`, `src/bun_core`, `src/base64`, `src/ptr`, and the JSC bindings outside the files that open dead-code PRs (#39929, #40232, #40367, #40294, #40172, #40122) already touch; the TS builtins in `src/js`. - hawk over `x86_64-unknown-linux-gnu`, `x86_64-pc-windows-msvc`, `aarch64-apple-darwin` (release profile, per `hawk.toml`): 847 `dead_public` findings. 668 are fields of FFI mirror structs (`libuv.rs`, `windows_sys/externs.rs`, `boringssl.rs`). Most of the rest are in files the open PRs own, are debug-only (`has_resolve_breakpoint`, `StoredTrace::capture`, `ArrayHashMap::unlock_pointers`), are codegen targets (`host_fn_this_value`), or are FFI enum mirrors (`tty::Mode::Io`, `ImplementationVisibility`). - oxlint with `no-unused-vars`, `no-unused-private-class-members`, `no-unreachable` over `src/js`: 0 findings. No `src/js` file is unimported. No `.rs` file is outside a `mod` tree except the three `[[bench]]` targets. - `--gc-sections` relink of `bun-debug`: 1005 non-generated discarded symbols, 283 of them in files no open PR touches. After removing sqlite3.c, llhttp, vendored shims, platform-gated code, and generated `ZigGeneratedClasses` helpers, the list above is what remains. Possibly dead, left alone: - `bun_core::strings::split_once` / `rsplit_once`: no caller today, but `clippy.toml` names them as the replacement for the denied `str::split_once` / `bstr::split_once_str` forms. Kept as API surface. - `src/jsc/bindings/webcore/streams/JSCrossRealmTransformState.{cpp,h}` (135 lines): the `CrossRealm` source and sink kinds in `StreamsForward.h` are never constructed. It reads as scaffolding for stream transfer in the native streams work, so it stays. - `ECDSASigPointer`, `ECGroupPointer`, `ECPointPointer`, `HMACCtxPointer`: default constructor, move constructor, and `release()` are unreferenced, but they are the smart-pointer idiom the rest of ncrypto follows. - `src/threading/Futex.rs` `wasm_impl` and `unsupported_impl`: no shipped target compiles them. - `bun_core::Global::StoredTrace::{EMPTY, capture}`, `has_resolve_breakpoint`, `ArrayHashMap::unlock_pointers`, `TaskTag::name`: release-dead, used under `debug_assertions`. </details>
This was referenced Aug 25, 2026
…FI, and unused Cargo dependencies bun-uws: drop template methods no translation unit instantiates (QueryParser.h and the getQuery callers, the App missingServerName chain, addressAsText, write offset accessors, Loop::defer and its queues, the WebSocket fragment helpers, unused WebSocketProtocol constants). bun-usockets: drop functions, prototypes, and macros with no caller (us_socket_detach, the unused group and listen socket accessors, the SNI find helpers, the unused quic stream helpers and on_open slot, the unused user argument of us_quic_socket_context_connect, us_fault_clear, us_nq_spec_peer_ctx). Bindings: drop the JSCommonJSExtensions function registry that Rust never calls, TopExceptionScope::clear_exception, Bun__linux_trace_close, and the js_printer Writer flush chain. Manifests: drop 23 dependency edges no source file names, and the typed-arena workspace entry they leave unused.
… the removed registry
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Re-reviewed after the follow-up commits — all four stale-reference cleanups I flagged (LoopData.h includes, the NodeModuleModule.rs WriteBarrier comment, the Socket::ext on_open doc, and the addressAsText provenance line) are addressed, and I found nothing new. Given the breadth (-576 lines across C/C++/Rust FFI boundaries) and the removal of GC-visiting machinery in JSCommonJSExtensions, a human pass is still worthwhile.
What was reviewed
- Confirmed the four follow-up commits landed the exact edits requested;
Http3Context.hpicks up its own<vector>include as the description states. m_registeredFunctions/visitChildrenremoval: custom loaders are held asCustomLoader::Custom(Strong)in Rust, and the newrequire-extensions.test.tscase exercises install →Bun.gc(true)→ call → replace → delete.us_quic_socket_context_connectsignature change: the droppeduserparam is threaded throughquic.h,uws_sys/quic/Context.rs, and the sole caller inh3_client/ClientContext.rs.
Extended reasoning...
Overview
This is a re-review after five follow-up commits landed on top of the original dead-code sweep. The PR removes ~576 net lines across 59 files: unused C API surface in bun-usockets (socket/context/QUIC/UDP helpers, macros), uninstantiated C++ template methods in bun-uws (QueryParser, App SNI helpers, AsyncSocket address formatting, Loop::defer + its queue state, WebSocket fragment senders), Rust/C++ FFI stubs (TopExceptionScope::clear_exception, Bun__linux_trace_close, WriterContext::flush), the JSCommonJSExtensions m_registeredFunctions WriteBarrier vector with its visitChildren, and 23 unused Cargo dependency edges. A new subprocess test pins the require.extensions handler lifecycle under GC pressure.
The four inline nits I raised on the first push — dead <mutex>/<thread>/<vector> includes in LoopData.h, the stale "gc-visitable WriteBarriers in C++" comment in NodeModuleModule.rs, the on_open reference in the quic::Socket::ext doc comment, and the AsyncSocket::addressAsText line in the uws_res_get_remote_address_info provenance comment — are all addressed by commits 9549b86, 973c388, and 5bf7b50. I verified each in the current diff.
Security risks
No new attack surface is introduced; this is pure removal. The one area REVIEW.md calls out explicitly is "don't silently delete existing Strong refs / roots you can't justify": the m_registeredFunctions WriteBarrier vector and its visitChildren are removed from JSCommonJSExtensions. The justification (Rust never called the append/set/swapRemove FFI; loaders are held as Strong in CustomLoader::Custom) is stated and the new test exercises the GC path, but this is exactly the class of change a human should confirm — a missed root here is a use-after-GC. The Loop::defer removal turns wakeupCb into a no-op, which is benign only because nothing ever enqueued to the defer queues; the us_wakeup_loop interrupt path is unchanged.
Level of scrutiny
High. The change is mechanically simple (deletions only, plus one FFI signature narrowing) but wide: it spans three languages, crosses FFI boundaries where the compiler cannot catch stale callers, and touches GC-rooting code. REVIEW.md's "public items escape dead-code lints — grep for callers manually" and "signature changes → grep the whole repo including cfg-gated code" both apply directly. The PR description documents the grep methodology and cross-target check, but that is author-asserted.
Other factors
All coderabbitai threads on the test file were resolved by a non-author. My four prior threads were author-self-resolved, but the diff confirms each was actually fixed in code. No CHANGES_REQUESTED reviews are outstanding. The exit reason was dry_streak. I am not approving because the change is large, crosses FFI/ABI boundaries, and removes a GC visitor — all categories the approval guidelines and REVIEW.md flag for human sign-off.
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Aug 27, 2026
…her crates (#40610) ### Problem - The workspace denies `dead_code` and `unreachable_pub`, and earlier sweeps removed the `pub` items a cross-crate analysis can see. What is left is code no lint reports: branches behind constant conditions, `pub` enum variants that nothing constructs, `pub` struct fields that nothing reads, and commented-out code. - The largest case is the js lexer: `LexerType` carried seven const generic parameters for a JSON mode (`IS_JSON`, `ALLOW_COMMENTS`, ...) that no caller ever set. The only instantiation is the default one, so every `if IS_JSON` body in `src/js_parser/lexer.rs` was unreachable. JSON is parsed by `src/parsers/json.rs`. ### Fix - Delete the items. 83 source files, +221 / -1653. Every candidate was checked with `rg` over `src/`, `build/debug/codegen/` and `src/codegen/`, including `#[cfg(windows)]` and macOS paths. The Notes list each one. - The lexer becomes a plain `struct Lexer<'a>`: the `JsonOptionsT` trait, the `NewLexer` alias, the `lexer_impl_header!` macro and the `generic_const_exprs` feature gate go with the JSON branches. The only JS-visible change is none: the default instantiation was the only one. - `bun_runtime::Error` loses 85 unit variants that are never built (the X509 codes live in `bun_http::CertError`; `InstallFailed` and friends are only ever nested as `Error::Install(..)`). The `AllocatorVTable` keeps only `free`, the one slot `StdAllocator` dispatches. - New source lint `test/internal/source-lints/literal-bool-condition.test.ts`: a statement-level `if true {` / `if false {` outside `#[cfg(test)]` code fails the lint. rustc and clippy accept both, so the dead `if false { break 'outer; }` in `doStep5.rs` and the always-taken `if true {` block in `Watcher.rs` (unwrapped here) had no other guard. The lint fails on `main` with those two lines and passes with this PR. - Verified: `bun bd`, `bun run rust:check-all` (12 targets), `cargo clippy --workspace`, `cargo check --workspace --tests`, `cargo fmt --check`. `bun bd test` on transpiler, bundler edge cases, shell, yaml, zstd, transpiler cache, `Bun.write`, `Bun.file`, sourcemap, resolver cache, WebSocket client, `bun add`/`bun remove`, lockfile sync, archive, `bun:test`, `--watch`, and the source lints (about 2,700 tests, 0 failures attributable to this change; see Notes). ### Background - `dead_code` does not report a `pub` item, a trait impl, an enum variant that a `match` arm names, or a field that a compound assignment (`+=`) touches. Each of those counts as a use to rustc even when nothing reads the result. - A `const bool` that is the same in every build (`const ALLOW_TMPFILE: bool = false`, a trait const no impl overrides, a const generic no caller sets) makes one side of its `if` unreachable, but rustc still type-checks and keeps that side. The removed branches are all of this kind. Flags that vary per build (`IS_WINDOWS`, `IS_DEBUG`, `ENABLE_ASAN`) and the debug toggles (`TRACING`, `VERBOSE_FS`-style logging switches that still have a body) were left alone. - `BunBuiltinNames.h` entries and JS private names can be referenced by string (`$getByIdDirectPrivate(this, "writer")`), so a name with no `$name` hit is not dead. Two such candidates were checked and kept. <details><summary>Notes</summary> Removed, constant conditions: - `src/js_parser/lexer.rs`: the 7 const generic parameters of `LexerType`, the `JsonOptionsT` trait, `DefaultJsonOptions`, the `NewLexer` alias and the `lexer_impl_header!` macro. 30 `if IS_JSON` bodies, `assert_not_json` and its 13 calls, the `is_ascii_only` field (only written in JSON mode), `Error::JSONStringsMustUseDoubleQuotes`, and the `if !FeatureFlags::ALLOW_JSON_SINGLE_QUOTES` block. `src/js_parser/lib.rs` drops `#![feature(adt_const_params, generic_const_exprs)]`, which nothing else in the crate used. - `src/bun_core/feature_flags.rs`: `ENABLE_ENTRY_CACHE` (always true: the "cache disabled" tails of `read_directory_error` and `read_directory_with_iterator` in `src/resolver/lib.rs`), `VERBOSE_FS` (always false: two `prettyln!` blocks in `src/resolver/fs.rs` and the `bstr::BStr` import), `HARDCODE_LOCALHOST_TO_127_0_0_1` (always false: the rewrite in `HTTPContext::connect` and `WebSocketUpgradeClient`), `ALLOW_JSON_SINGLE_QUOTES` (only read by the lexer JSON mode). - `src/sys/tmp.rs`: `ALLOW_TMPFILE = false` with the `O_TMPFILE` open and `linkat` paths and the `using_tmpfile` field. `RuntimeTranspilerCache.rs` always unlinks the tmp name on failure now, which is what the `!using_tmpfile` guard already did. The non-Linux `O::TMPFILE` consts and `linkat_tmpfile` stubs in `src/sys/lib.rs` had no other caller (`src/install/npm.rs` uses them under `cfg(linux)`). - `src/libarchive/lib.rs`: `ArchiveAppender::HAS_APPEND_MUTABLE`, no impl overrides the `false` default. With it: `append_mutable`, the `if A::HAS_APPEND_MUTABLE` block, `Context::all_files`, `EntryMap`, `U64Context` and its two impls, and the `all_files` initializer in `create_command.rs`. - `src/bundler/linker_context/doStep5.rs`: `if false { break 'outer; }` and the label. `src/watcher/Watcher.rs`: an `if true {` block around the "Added to watch list" log, unwrapped. - `src/io/PipeWriter.rs`: `PosixStreamingWriterParent::HAS_ON_READY`, set by both impls (the macro and `Terminal.rs`), read by nothing. Removed, enum variants nothing constructs (each with its `name()` arm and match arms): - `bun_runtime::Error` (`src/runtime/error.rs`): `Panic`, `RequestBodyNotReusable`, `DNSResolveFailed`, `TooManyRedirects`, `ConnectionRefused`, `RedirectURLInvalid`, the 66 X509 verification codes from `UNABLE_TO_GET_ISSUER_CERT` to `UNKNOWN_CERTIFICATE_VERIFICATION_ERROR`, `InstallFailed`, `InvalidPackageJSON`, `PathAlreadyExists`, `InvalidTarget`, `OpenFailed`, `UnableToDecode`, `SocketClosed`, `StackOverflow`, `Test`, `MissingTranspileExtra`, `PluginError`, `Name`, `EscapeCalledTwice`. The or-patterns in `install_command.rs`, `pm_update_package_json.rs` and `jsc_hooks.rs` keep their live alternatives. - `bun_core::strings::BOM::{Utf16Be, Utf32Le, Utf32Be}`: `detect()` only returns `Utf8` and `Utf16Le`. With them: the three byte-pattern consts, the `_ =>` arms in the two `remove_and_convert_*` functions, and the commented-out detection lines. - `bun_shell_parser`: `Token::{Dollar, Eq}` and `TokenTag::{Dollar, Eq}` (the lexer never pushes them), with the `TestToken` mirrors and JSON arms in `src/runtime/shell/shell_body.rs`. - `ShellErr::Todo` (`shell_body.rs`, `Builtin.rs`), `bun_crash_handler::Error::InvalidDebugInfo` (patterns in `crash_handler/lib.rs` and `jsc/btjs.rs`) and the `bun_jsc::Error::InvalidDebugInfo` mirror, `FetchFlags::PrintSourceAndClone` (`ModuleLoader.rs`, arm in `jsc_hooks.rs`), yaml `ParseError::InvalidIndentation` and the `ParseResultError::InvalidIndentation` it alone produced, `bun_sourcemap::Error::Unknown`. Removed, fields nothing reads: - `AllocatorVTable::{alloc, resize, remap}` (`src/bun_alloc/lib.rs`): only `free` is ever dispatched. With them: `NO_ALLOC`/`NO_RESIZE`/`NO_REMAP`, `MimallocAllocator` and its four functions in `basic.rs`, `default_alloc::{malloc_aligned, realloc_aligned}` and `Alignment::to_byte_units`. - `ArgumentsSlice::all` (`src/jsc/CallFrame.rs`), `ParseTask::tree_shaking` (`src/bundler/ParseTask.rs`, 11 writers in `bundle_v2.rs`; the parser reads `topts.tree_shaking`), `JSMeta::entry_point_part_index` (`LinkerGraph.rs`, written in `scanImportsAndExports.rs`), `NetworkSink::high_water_mark` (`streams.rs`, `s3/client.rs`, with the `part_size` locals that fed it), `CopyFile::read_off`, the POSIX `ReadFile::byte_store`, `file_sink::Options::close`, `ZstdReaderArrayList::total_out`, `Cloner::trees_count`. Removed, commented-out code older than six months (blame on the line, or on the Zig line the port copied): - C++: `ImportMetaObject.cpp`, `InspectorHTTPServerAgent.cpp`, `JSDOMExceptionHandling.cpp`, `ncrypto.cpp`, `KeyObject.cpp`, `EventTarget.cpp`, `JSPerformanceEntryCustom.cpp`, `MessageEvent.h` (plus a duplicate `#include "MessagePort.h"`), `Performance.cpp`, `Performance.h`, `PerformanceEntry.cpp`, `PerformanceObserver.cpp`, `PerformanceResourceTiming.cpp`, `WebSocket.cpp`. - Rust: `AstBuilder.rs`, `postProcessCSSChunk.rs`, `postProcessJSChunk.rs`, `crash_handler/lib.rs`, `css/declaration.rs`, `css/selectors/selector.rs`, `css/values/percentage.rs`, `WebSocketUpgradeClient.rs`, `lexer.rs`, `parse_fn.rs`, `visit_expr.rs`, `paths/resolve_path.rs`, `exec_command.rs`, `braces.rs`, `sha_hmac/sha.rs`, `StaticHashMap.rs`, `ffi_body.rs`. - `.classes.ts`: disabled entries in `sql.classes.ts`, `sockets.classes.ts`, `server.classes.ts`, `jest.classes.ts`; a leftover loop in `generate_uv_posix_stubs.ts`. Declaration-only C++: `CryptoKeyOKP::platformExportSpki/platformExportPkcs8`, `JSX509Certificate::getPublicKey`, `KeyPairJobCtx::deinit`, `BunShell`/`ShellError` in `BunObject.h`. Checked and kept: `Terminal::get_slave_fd` (used by `js_bun_spawn_bindings.rs`), `macro(writer)` and `macro(mockedFunction)` in `BunBuiltinNames.h` (`$getByIdDirectPrivate(this, "writer")` in `ConsoleObject.ts`, `BunCommonStrings.h`), css `Segment::Name` and `CssModuleExport::is_referenced` (lightningcss data model), the react_compiler variants and fields that mirror the upstream schema, `Mode::ProductionDynamic` (bake scaffolding), the MySQL protocol fields that mirror the wire format, the debug toggles `LOG_ALLOCATIONS`, `DISABLE_COMPRESSION_IN_HTTP_CLIENT`, crash handler `ENABLE`, `ENABLE_AUTO_CORK`/`ENABLE_ALLOCATOR_POOL`, and the wasm scaffolding behind `IS_WASM`/`IS_BROWSER`. Test runs: `test/js/web/fetch/fetch.test.ts` fails the same 26 tests with the released `bun` in this container (root user, no network). `Bun.write > copyFileRange is not available > on large files` hits its 5 s timeout under the ASAN debug build while filling a 256 MB buffer in JS; the copy itself takes 0.6 s and the hash matches. This PR repeats no deletion of the open dead-code PRs (#39929, #40122, #40172, #40232, #40294, #40367, #40492, #40525, #40557), checked by diffing the removed lines. Three files are shared with them in other regions (`src/install/lockfile/Package.rs`, `src/runtime/cli/create_command.rs`, `src/runtime/jsc_hooks.rs`). </details> <!-- robobun:evidence:begin --> --- **[review]** gate passed · iteration 2 · 84 files touched <details><summary>fails on main (without fix)</summary> ```console ASAN without fix: BUILD FAILED (no junit output) $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/mechgate.xml" test/internal/source-lints/literal-bool-condition.test.ts ninja: Entering directory `/workspace/bun/build/debug' [1/166] gen generated_host_exports.rs generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 243 extern-C blocks audited [2/166] gen ZigGeneratedClasses.{cpp,h,rs} Found 2 classes from /workspace/bun/src/jsc/resolve_message.classes.ts - ResolveMessage (15 fields) - BuildMessage (10 fields) Found 1 classes from /workspace/bun/src/runtime/api/Archive.classes.ts - Archive (4 fields, 1 class fields) Found 2 classes from /workspace/bun/src/runtime/api/BunObject.classes.ts - ResourceUsage (8 fields) - Subprocess (20 fields) Found 1 classes from /workspace/bun/src/runtime/api/cron.classes.ts - CronJob (5 fields) Found 3 classes from /workspace/bun/src/runtime/api/filesystem_router.classes.ts - FileSystemRouter (5 fields) - FrameworkFileSystemRouter (2 fields) - MatchedRoute (8 fields) Found 1 classes from /workspace/bun/src/runtime/api/Glob.classes.ts - Glob (5 fields) Found 1 classes fro ... (truncated) release without fix: 1 FAILED bun test v1.4.1-canary.1 (9e0b058) test/internal/source-lints/literal-bool-condition.test.ts: (pass) scans a non-empty set of tracked Rust sources [0.09ms] (pass) withoutTestItems keeps production code and blanks #[cfg(test)] items [0.09ms] 234 | "fn after_strings() {}", 235 | ]); 236 | }); 237 | 238 | test("if true { .. } / if false { .. } outside #[cfg(test)] code", () => { 239 | expect(offenders).toEqual([]); ^ error: expect(received).toEqual(expected) - [] + [ + "src/bundler/linker_context/doStep5.rs:308: if false {", + "src/watcher/Watcher.rs:752: if true {", + ] - Expected - 1 + Received + 4 at <anonymous> (/workspace/bun/test/internal/source-lints/literal-bool-condition.test.ts:239:21) (fail) if true { .. } / if false { .. } outside #[cfg(test)] code [0.19ms] 2 pass 1 fail 3 expect() calls Ran 3 tests across 1 file. [798.00ms] __F:1:S:0 ``` </details> <details><summary>passes on PR (with fix)</summary> ```console ASAN with fix: all passed $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/mechgate.xml" test/internal/source-lints/literal-bool-condition.test.ts bun test v1.4.1 (731aa92) test/internal/source-lints/literal-bool-condition.test.ts: (pass) scans a non-empty set of tracked Rust sources [2.29ms] (pass) withoutTestItems keeps production code and blanks #[cfg(test)] items [4.24ms] (pass) if true { .. } / if false { .. } outside #[cfg(test)] code [1.22ms] 3 pass 0 fail 3 expect() calls Ran 3 tests across 1 file. [62.41s] __F:0:S:0 release with fix: all passed $ bun scripts/build.ts --profile=release [configured] bun-profile → bun (stripped) in 631ms (unchanged) ninja: Entering directory `/workspace/bun/build/release' [1/126] gen generated_host_exports.rs generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 243 extern-C blocks audited [2/126] gen ZigGeneratedClasses.{cpp,h,rs} Found 2 classes from /workspace/bun/src/jsc/resolve_message.classes.ts - ResolveMessage (15 fields) - BuildMessage (10 fields) Found 1 classes from /workspace/bun/src/runtime/api/Archive.classes.ts - Archive (4 fields, 1 class fields) Found 2 classes from /workspace/bun/src/runtime/api/BunObject.classes.ts - ResourceUsage (8 fields) - Subprocess (20 fields) Found 1 classes from /workspace/bun/src/runtime/api/cron.classes.ts - CronJob (5 fields) Found 3 classes from /workspace/bun/src/runtime/api/filesystem_router.classes.ts - FileSystemRouter (5 fields) - FrameworkFileSystemRouter (2 fields) - MatchedRoute (8 fields) Found 1 classes from /workspace/bun/src/runtime/api/Glob.classes.ts - Glob (5 fields) Found 1 classes from /workspace/bun/src/runtime/api/h2.classes.ts - H2FrameParser (32 fields) Found ... (truncated) ``` </details> <details><summary>diff hotspot</summary> ``` src/bun_alloc/basic.rs | 73 +-- src/bun_alloc/lib.rs | 105 +--- src/bun_core/feature_flags.rs | 14 - src/bun_core/string/immutable/unicode.rs | 28 - src/bundler/AstBuilder.rs | 4 - src/bundler/LinkerGraph.rs | 3 - src/bundler/ParseTask.rs | 4 - src/bundler/bundle_v2.rs | 9 - src/bundler/linker_context/doStep5.rs | 5 +- src/bundler/linker_context/postProcessCSSChunk.rs | 9 - src/bundler/linker_context/postProcessJSChunk.rs | 5 - .../linker_context/scanImportsAndExports.rs | 2 - src/collections/StaticHashMap.rs | 7 - src/crash_handler/error.rs | 3 - src/crash_handler/lib.rs | 7 +- src/css/declaration.rs | 4 - src/css/selectors/selector.rs | 23 - src/css/values/percentage.rs | 11 - src/http/HTTPContext.rs | 16 +- .../websocket_client/WebSocketUpgradeClient.rs | 19 +- src/install/lockfile.rs | 2 - src/install/lockfile/Package.rs | 4 +- src/io/PipeWriter.rs | 2 - src/js_parser/lexer.rs | 631 ++++----------------- src/js_parser/lib.rs | 6 - src/js_parser/parse/parse_fn.rs | 3 - src/js_parser/visit/visit_expr.rs | 6 - src/jsc/CallFrame.rs | 9 +- src/jsc/ModuleLoader.rs | 1 - src/jsc/RuntimeTranspilerCache.rs | 6 +- src/jsc/bindings/BunObject.h | 3 - src/jsc/bindings/ImportMetaObject.cpp | 4 - src/jsc/bindings/InspectorHTTPSe ... (truncated) ``` </details> **gate history** · 2 passed · 1 rejected · iteration 2 <details><summary>evidence per changed file</summary> ``` file reads edits tests src/bun_alloc/basic.rs 0 0 0 src/bun_alloc/lib.rs 0 0 0 src/bun_core/feature_flags.rs 1 0 0 src/bun_core/string/immutable/unicode.rs 0 0 0 src/bundler/AstBuilder.rs 0 0 0 src/bundler/LinkerGraph.rs 0 0 0 src/bundler/ParseTask.rs 0 0 0 src/bundler/bundle_v2.rs 0 0 0 src/bundler/linker_context/doStep5.rs 0 0 0 src/bundler/linker_context/postProcessCSSChunk.rs 0 0 0 src/bundler/linker_context/postProcessJSChunk.rs 0 0 0 src/bundler/linker_context/scanImportsAndExports.rs 0 0 0 src/collections/StaticHashMap.rs 0 0 0 src/crash_handler/error.rs 0 0 0 src/crash_handler/lib.rs 0 0 0 src/css/declaration.rs 0 0 0 (+ 68 more files) ``` </details> <!-- robobun:evidence:end --> --------- Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
This was referenced Aug 28, 2026
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Jarred-Sumner
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Sep 15, 2026
…ter, NodeHTTPResponse, and three JS binding objects (#42682) ### Problem - Some native members exist only for built-in JS to call, and no built-in JS calls them. The largest is `H2FrameParser.setStreamPriority` (`src/runtime/api/bun/h2_frame_parser.rs`). `Http2Stream#priority()` is a no-op since RFC 9113. - Three binding objects (`node:vm`, `node:crypto`, `bun:sql`) carry properties that their only JS consumer never reads. - `packages/bun-usockets` keeps a commented-out `bsd_udp_packet_buffer_ecn` from 2024-04. Nothing reads `completions/spec.yaml`, a 2021 appspec file. ### Fix - Delete each item: 15 files, 535 lines removed. The Notes list every symbol. - Correct because every removed name has zero references in `src/`, `packages/`, `scripts/`, `test/` and `build/debug/codegen/` outside its own definition. No removed member is documented or typed API. User code reaches the h2 parser handle only through the undocumented `Symbol.for("::bunhttp2native::")` key. - The `-D dead-code` lint then reported three more items in `h2_frame_parser.rs`, and two `Stream` fields became write-only. They are removed too. - Verified: `bun bd` and `bun run rust:check-all` (12 targets) pass. The http2, shell, vm, crypto, `node:http`, sql, udp and streams test files pass (list in the Notes). ### Background - A `*.classes.ts` file declares the methods of a native class. The generator emits the C++ wrapper and the Rust glue from it. A `proto` entry that no JS reads is dead, and so is its Rust function. - A binding object is a plain object that native code fills and one built-in module destructures once. A property that the module does not destructure is never read. - 28 other dead-code pull requests are open. This one deletes nothing that they delete. #40240 and #37588 edit the body of `set_stream_priority`. Each conflict resolves by taking the deletion. <details><summary>Notes</summary> Removed, one line each: - `H2FrameParser.setStreamPriority` / `set_stream_priority` (109 lines). No `.setStreamPriority(` in `src/js` or `test/`. - `H2FrameParser.isStreamAborted` / `is_stream_aborted`. Same check. - `H2FrameParser.hasNativeRead` / `has_native_read`. Same check. - `FrameType::HTTP_FRAME_PRIORITY`, `ErrorCode::PROTOCOL_ERROR`, `SignalRef::is_aborted`. Reported by the dead-code lint once the three functions above were gone. Both enums already list only the wire values that the file uses. - `Stream::stream_dependency`, `Stream::exclusive`. Their only reads were in `set_stream_priority`. The declarations, the initializers and the two stores in `request()` go. The locals that `request()` writes to the wire stay, and so does `Stream::weight` (read by `getStreamState`). - `ShellInterpreter.isRunning` / `is_running` and `.started` / `get_started`. `src/js/builtins/shell.ts` only calls `interp.run()`. - `Interpreter::started`. The field was only read by `get_started`. The two stores and the `AtomicBool` import go with it. - `NodeHTTPResponse.dumpRequestBody` / `dump_request_body`. Added in #17093, never called from JS at any commit. - `createNodeVMBinding`: `kUnlinked`, `kLinking`, `kEvaluating`, `kSourceText`, `kSynthetic`. `src/js/node/vm.ts` destructures `kLinked`, `kEvaluated`, `kErrored` and never touches the binding object again. - `createNodeCryptoBinding`: `SecretKeyObject`, `PublicKeyObject`, `PrivateKeyObject`. Not destructured in `src/js/node/crypto.ts`. The classes stay, only the unread properties go. - `bun_sql_jsc::mysql::create_binding`: `MySQLConnection`. `bun_sql_jsc::postgres::create_binding`: `PostgresSQLConnection`. `src/js/internal/sql/{mysql,postgres}.ts` destructure `createConnection`, `createQuery`, `init` only. - `packages/bun-usockets`: the commented-out `bsd_udp_packet_buffer_ecn` (`bsd.c`), its commented-out wrapper `us_udp_packet_buffer_ecn` (`udp.c`), and the two commented-out declarations (`libusockets.h`, `internal/networking/bsd.h`). `git blame`: 589f941, 2024-04-26. The `libusockets.h` lines are context lines of a hunk in #40294. - `completions/spec.yaml`. No hit for `spec.yaml` or `appspec` in the repo. It still lists the removed `bun dev` subcommand. The shell completions are hand-maintained and embedded with `include_bytes!`. Tests run with the debug build: `test/js/node/http2/` (7 files, `node-http2.test.js` 387 pass, `h2-conformance.test.ts` 70 pass), the four `test-http2-*priority*` Node tests, `test/js/bun/shell/` (4 files), `test/js/node/vm/vm.test.ts`, `crypto.key-objects.test.ts`, five `test/js/node/http/` files, five `test/js/sql/` files, `udp_socket.test.ts`, `streams.test.js`. How the candidates were found: - A repo-wide identifier index (definitions with zero other mentions, with and without comments). - A relink of the debug binary with `--gc-sections --print-gc-sections`. Almost every real hit from that pass is already deleted by one of the open pull requests. The rest were inlined functions, `const fn`s used only at compile time, and Windows or macOS paths. - A per-class comparison of every `*.classes.ts` member against `src/js`, `packages/bun-types` and `test/`. The generated thunk for a `proto` entry is `#[no_mangle]` and `#[allow(dead_code)]`, so neither rustc nor the linker can flag these members. - Checks for `.rs` files outside every `mod` tree, headers that nothing includes, C/C++ files outside the build, Cargo features that nothing enables, and long commented-out blocks. All clean apart from the usockets block. Found, not deleted here: - `TCPSocket`/`TLSSocket` `endBuffered` (`$end`): no JS caller, but its removal leaves `write_or_end_buffered::<IS_END>` with one instantiation. That is a refactor, not a deletion. - `*InternalReadableStreamSource.isClosed` getter: no reader, but its removal leaves `NewSource::is_closed` write-only, and the stores are in files that #41088 touches. - `NodeHTTPResponse.onwritable`: no reader in `src/js` today, but #41822 starts to use it. - The HEADERS+PRIORITY emitter and the native `SignalRef` abort path in `H2FrameParser::request()`. `http2.ts` warns with DEP0194 for the priority options and handles `options.signal` itself. Whether these native paths still run needs a separate look. - The `IPV6_RECVTCLASS` / `IP_RECVTOS` `setsockopt` calls in `packages/bun-usockets/src/bsd.c` ("used for getting the ECN"). Nothing reads the ECN now, but their removal changes socket options, so it is not a pure deletion. - `macro(mockedFunction)` and `macro(writer)` in `src/js/builtins/BunBuiltinNames.h` (the builtin-name entries, not the live `mockedFunction` string in `BunCommonStrings.h`): no `mockedFunctionPrivateName` or `writerPrivateName` user, but two open pull requests edit adjacent lines. - `scripts/packer/build-image.pkr.hcl`, `scripts/lldb-inline.sh`, `scripts/lldb-inline-tool.cpp`, `scripts/github-metrics.ts`, `scripts/gamble.ts`: nothing references them, but they are standalone tools that a person can run by hand. Self-reviewed: 12 concerns raised, 10 addressed (the two `Stream` fields, the header comment lines, and the body corrections above). Rejected: a split into three pull requests, because every deletion is verified the same way and a split triples the CI and review rounds. Deferred: a caller lint for `*.classes.ts` `proto` entries, as a follow-up that does not gate this change. </details>
usrbinkat
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Sep 15, 2026
…ter, NodeHTTPResponse, and three JS binding objects (oven-sh#42682) ### Problem - Some native members exist only for built-in JS to call, and no built-in JS calls them. The largest is `H2FrameParser.setStreamPriority` (`src/runtime/api/bun/h2_frame_parser.rs`). `Http2Stream#priority()` is a no-op since RFC 9113. - Three binding objects (`node:vm`, `node:crypto`, `bun:sql`) carry properties that their only JS consumer never reads. - `packages/bun-usockets` keeps a commented-out `bsd_udp_packet_buffer_ecn` from 2024-04. Nothing reads `completions/spec.yaml`, a 2021 appspec file. ### Fix - Delete each item: 15 files, 535 lines removed. The Notes list every symbol. - Correct because every removed name has zero references in `src/`, `packages/`, `scripts/`, `test/` and `build/debug/codegen/` outside its own definition. No removed member is documented or typed API. User code reaches the h2 parser handle only through the undocumented `Symbol.for("::bunhttp2native::")` key. - The `-D dead-code` lint then reported three more items in `h2_frame_parser.rs`, and two `Stream` fields became write-only. They are removed too. - Verified: `bun bd` and `bun run rust:check-all` (12 targets) pass. The http2, shell, vm, crypto, `node:http`, sql, udp and streams test files pass (list in the Notes). ### Background - A `*.classes.ts` file declares the methods of a native class. The generator emits the C++ wrapper and the Rust glue from it. A `proto` entry that no JS reads is dead, and so is its Rust function. - A binding object is a plain object that native code fills and one built-in module destructures once. A property that the module does not destructure is never read. - 28 other dead-code pull requests are open. This one deletes nothing that they delete. oven-sh#40240 and oven-sh#37588 edit the body of `set_stream_priority`. Each conflict resolves by taking the deletion. <details><summary>Notes</summary> Removed, one line each: - `H2FrameParser.setStreamPriority` / `set_stream_priority` (109 lines). No `.setStreamPriority(` in `src/js` or `test/`. - `H2FrameParser.isStreamAborted` / `is_stream_aborted`. Same check. - `H2FrameParser.hasNativeRead` / `has_native_read`. Same check. - `FrameType::HTTP_FRAME_PRIORITY`, `ErrorCode::PROTOCOL_ERROR`, `SignalRef::is_aborted`. Reported by the dead-code lint once the three functions above were gone. Both enums already list only the wire values that the file uses. - `Stream::stream_dependency`, `Stream::exclusive`. Their only reads were in `set_stream_priority`. The declarations, the initializers and the two stores in `request()` go. The locals that `request()` writes to the wire stay, and so does `Stream::weight` (read by `getStreamState`). - `ShellInterpreter.isRunning` / `is_running` and `.started` / `get_started`. `src/js/builtins/shell.ts` only calls `interp.run()`. - `Interpreter::started`. The field was only read by `get_started`. The two stores and the `AtomicBool` import go with it. - `NodeHTTPResponse.dumpRequestBody` / `dump_request_body`. Added in oven-sh#17093, never called from JS at any commit. - `createNodeVMBinding`: `kUnlinked`, `kLinking`, `kEvaluating`, `kSourceText`, `kSynthetic`. `src/js/node/vm.ts` destructures `kLinked`, `kEvaluated`, `kErrored` and never touches the binding object again. - `createNodeCryptoBinding`: `SecretKeyObject`, `PublicKeyObject`, `PrivateKeyObject`. Not destructured in `src/js/node/crypto.ts`. The classes stay, only the unread properties go. - `bun_sql_jsc::mysql::create_binding`: `MySQLConnection`. `bun_sql_jsc::postgres::create_binding`: `PostgresSQLConnection`. `src/js/internal/sql/{mysql,postgres}.ts` destructure `createConnection`, `createQuery`, `init` only. - `packages/bun-usockets`: the commented-out `bsd_udp_packet_buffer_ecn` (`bsd.c`), its commented-out wrapper `us_udp_packet_buffer_ecn` (`udp.c`), and the two commented-out declarations (`libusockets.h`, `internal/networking/bsd.h`). `git blame`: 589f941, 2024-04-26. The `libusockets.h` lines are context lines of a hunk in oven-sh#40294. - `completions/spec.yaml`. No hit for `spec.yaml` or `appspec` in the repo. It still lists the removed `bun dev` subcommand. The shell completions are hand-maintained and embedded with `include_bytes!`. Tests run with the debug build: `test/js/node/http2/` (7 files, `node-http2.test.js` 387 pass, `h2-conformance.test.ts` 70 pass), the four `test-http2-*priority*` Node tests, `test/js/bun/shell/` (4 files), `test/js/node/vm/vm.test.ts`, `crypto.key-objects.test.ts`, five `test/js/node/http/` files, five `test/js/sql/` files, `udp_socket.test.ts`, `streams.test.js`. How the candidates were found: - A repo-wide identifier index (definitions with zero other mentions, with and without comments). - A relink of the debug binary with `--gc-sections --print-gc-sections`. Almost every real hit from that pass is already deleted by one of the open pull requests. The rest were inlined functions, `const fn`s used only at compile time, and Windows or macOS paths. - A per-class comparison of every `*.classes.ts` member against `src/js`, `packages/bun-types` and `test/`. The generated thunk for a `proto` entry is `#[no_mangle]` and `#[allow(dead_code)]`, so neither rustc nor the linker can flag these members. - Checks for `.rs` files outside every `mod` tree, headers that nothing includes, C/C++ files outside the build, Cargo features that nothing enables, and long commented-out blocks. All clean apart from the usockets block. Found, not deleted here: - `TCPSocket`/`TLSSocket` `endBuffered` (`$end`): no JS caller, but its removal leaves `write_or_end_buffered::<IS_END>` with one instantiation. That is a refactor, not a deletion. - `*InternalReadableStreamSource.isClosed` getter: no reader, but its removal leaves `NewSource::is_closed` write-only, and the stores are in files that oven-sh#41088 touches. - `NodeHTTPResponse.onwritable`: no reader in `src/js` today, but oven-sh#41822 starts to use it. - The HEADERS+PRIORITY emitter and the native `SignalRef` abort path in `H2FrameParser::request()`. `http2.ts` warns with DEP0194 for the priority options and handles `options.signal` itself. Whether these native paths still run needs a separate look. - The `IPV6_RECVTCLASS` / `IP_RECVTOS` `setsockopt` calls in `packages/bun-usockets/src/bsd.c` ("used for getting the ECN"). Nothing reads the ECN now, but their removal changes socket options, so it is not a pure deletion. - `macro(mockedFunction)` and `macro(writer)` in `src/js/builtins/BunBuiltinNames.h` (the builtin-name entries, not the live `mockedFunction` string in `BunCommonStrings.h`): no `mockedFunctionPrivateName` or `writerPrivateName` user, but two open pull requests edit adjacent lines. - `scripts/packer/build-image.pkr.hcl`, `scripts/lldb-inline.sh`, `scripts/lldb-inline-tool.cpp`, `scripts/github-metrics.ts`, `scripts/gamble.ts`: nothing references them, but they are standalone tools that a person can run by hand. Self-reviewed: 12 concerns raised, 10 addressed (the two `Stream` fields, the header comment lines, and the body corrections above). Rejected: a split into three pull requests, because every deletion is verified the same way and a split triples the CI and review rounds. Deferred: a caller lint for `*.classes.ts` `proto` entries, as a follow-up that does not gate this change. </details>
Jarred-Sumner
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Sep 15, 2026
…al-field cells, Http2Response, and the WebView ObjC wrappers (#42816) ### Problem - Four native class members exist only for built-in JS, and nothing calls them: the SQL connection `connected` getter and `onconnect` accessor, `NodeHTTPResponse.ended`, and `crash_handler.getFeaturesAsVLQ`. - Thirteen `JSInternalFieldObjectImpl` subclasses carry a copied `static size_t allocationSize(Checked<size_t>)`. Each `create()` uses `allocateCell<T>(vm)`, which takes `sizeof(T)`. JavaScriptCore calls `allocationSize` only on its own classes. - Other leftovers have no reader: two WebCore members, eight `Http2Response` members and the `socketData` field behind one of them, two `ObjCRuntime` wrappers, `.typos.toml`, and `packages/bun-error/img/*`. ### Fix - Delete each item: 31 files, 154 lines and 4 images removed. The Notes list every symbol. - Correct because every removed name has zero references in `src/`, `packages/`, `scripts/`, `test/` and `build/debug/codegen/` outside its own definition. No removed member is documented or typed API. - Verified: `bun bd` and `bun run rust:check-all` (12 targets) pass. The sql, `node:http`, streams, `serve-http2`, node error-code, performance and crash-handler test files pass. `ObjCRuntime` compiles only on macOS, so CI is the compile check for those 13 lines. ### Background - A `*.classes.ts` file declares the members of a native class. The generator emits the C++ wrapper and the Rust glue. The generated thunk is `#[no_mangle]`, so neither rustc nor the linker reports a member that no JS reads. - `values: ["onconnect", ...]` in `sql.classes.ts` declares a GC-visited slot on the wrapper. Native code uses the slot through `onconnect_get_cached` / `onconnect_set_cached`. The removed accessor was a JS-facing route to the same slot. The slot stays. - 34 other dead-code pull requests are open. This one deletes nothing that they delete. Six files overlap on other lines (listed in the Notes). <details><summary>Notes</summary> No test is added. The change deletes code that has no user, so it has no behavior to cover, and REVIEW.md says not to add tests that check dead code stays dead. Overlap with open pull requests: - No deleted line is a line that one of the 34 open dead-code pull requests deletes (checked line by line against their diffs). - Six files also change in one of them, on other lines: `scripts/glob-sources.ts` (#40232), `src/jsc/bindings/ErrorCode.h` (#39929), `JSOneShotDirectSink.h` (#41385), `JSStreamAlgorithmContexts.h` (#41445), `src/runtime/api/crash_handler_jsc.rs` (#41385), `src/sql_jsc/postgres/PostgresSQLConnection.rs` (#40824). - The diffs of the 227 open pull requests (newest 2,500) that touch the `node:http`, sql, crash-handler, streams-header, webview or uws HTTP/2 files add no user of a removed name. Removed, one line each: - `PostgresSQLConnection.connected` / `MySQLConnection.connected` and both `get_connected`. Every `.connected` in `src/js/internal/sql/` and `src/js/bun/sql.ts` is `PooledConnectionState.connected`. `test/js/sql` mentions it in comments only. - `PostgresSQLConnection.onconnect` / `MySQLConnection.onconnect` accessor and the two `(get_on_connect, set_on_connect => ...)` lines of `cached_prop_hostfns!`. Every JS `onconnect` is on the options object (`connectionInfo.onconnect`, `ret.onconnect`). - `NodeHTTPResponse.ended` / `get_ended`. The `_http_*` modules read `handle.flags & NodeHTTPResponseFlags.ended`. The other `.ended` hits are `queued.ended`, `_readableState.ended`, and the JS handle in `http1_server_fallback.ts`. - `crash_handler.getFeaturesAsVLQ` / `js_get_features_as_vlq`, and the `BoundedArray` import that only it used. `getFeatureData` and the other entries have users in `test/`, `scripts/` or `packages/bun-release`. - `allocationSize` in `InternalModuleRegistry.h`, `ErrorCode.h` (`ErrorCodeCache`), `BunStreamSource.h`, `JSAsyncIteratorSourceOperation.h`, `JSDirectStreamSource.h`, `JSOneShotDirectSink.h`, `JSReadRequest.h` (2), `JSReadStreamIntoSinkOperation.h`, `JSReadableStreamIntoArrayOperation.h`, `JSStreamAlgorithmContexts.h`, `JSStreamTeeState.h`, `JSStreamPipeToOperation.h`. `rg allocationSize src packages build/debug/codegen` found the 14 definitions and no call. The debug objects contain no `allocationSize` symbol for a bun class. The fourteenth copy, in `JSCrossRealmTransformState.h`, stays because #41445 deletes that file. - #41268 lists `InternalModuleRegistry::allocationSize` under "Kept on purpose" because it corrects the base class version, which returns `sizeof(JSInternalFieldObjectImpl)`. That reason does not hold. Nothing calls either version for these classes, `allocateCell<T>(vm)` sizes the cell from `sizeof(T)`, and four other subclasses (`ModuleLoader.h`, `JSSocketHandlers.h`, `JSNextTickQueue.h`, `JSMockFunction.h`) never had the copy. - `JSPerformanceResourceTiming::protectedWrapped`. The callers of `protectedWrapped()` are on `JSDOMURL`, `JSAbortSignal` and the `CookieMap` wrapper. - `ResourceLoadTiming::isolatedCopy`. No caller. - `Http2Response::getWriteOffset`, `overrideWriteOffset`, `getSocketData`, `prepareForSendfile`, `uncork`, `isCorked`, `getNativeHandle`, `isConnectRequest` (`packages/bun-uws/src/Http2Context.h`), and `Http2ResponseData::socketData`, which only `getSocketData` read and nothing wrote. The callers of the last four names in `libuwsockets.cpp` are on `HttpResponse<SSL>` and `AsyncSocket<SSL>`. `libuwsockets_h2.cpp` uses none of the eight. #40294 removes the same-named members of `HttpResponse` and `Http3Response`. - `ObjCRuntime`: `struct NSObject` (only member: `describe()`), `Ref::s_description`, `WKWebView::isLoading()`, `WKWebView::s_isLoading`. Each name has only its declaration, definition and `sel(...)` initializer. - `.typos.toml`. Its runner, `.github/workflows/typos.yml`, was deleted in 126f468 (2025-11-05). - `packages/bun-error/img/{close.png,error.png,powered-by.png,powered-by.webp}`, last touched 2021-09-11. `bun-error.css` uses inline `data:` URIs. The `img/*` glob in `scripts/glob-sources.ts` goes with them. Tests run with the debug build: `test/js/sql/sql-onconnect-onclose-throw.test.ts` (9), `sql-connection-socket-uaf.test.ts` (2), `sql-mysql-clean-reentry.test.ts` (1), `sql-mysql.test.ts`, `sql.test.ts`, `test/js/node/http/node-http.test.ts` (159), `node-http-uaf.test.ts` (9), `test/js/web/streams/streams.test.js` (563), `test/js/bun/http/serve-http2.test.ts` (90), `test/js/web/timers/performance-entries.test.ts`, `test/cli/run/run-crash-handler.test.ts` (28), `test/js/node/errors/` (2 files), `test/js/bun/util/error-code-mirror.test.ts`. How the candidates were found: - A repo-wide identifier index (definitions with zero other mentions, comments stripped). - A compiler pass over a scratch copy of the workspace: every `pub` item that no other crate names becomes `pub(crate)`, then `cargo check --force-warn dead_code` runs for linux (dev and release), windows and macos. A loop restores `pub` at each definition that a privacy error points to. 131 leaf items came out of it. - A second compiler pass marks each of those 131 items `#[deprecated]` in an unmodified copy and checks all four configurations again. 88 had a real user. The first pass misses them because a private inherent method silently loses method resolution to a trait method of the same name. 43 had none. - Manual review dropped all 43: unit-test users (`CowSlice::init_dupe`, `clap::SliceIterator`, `Imports::ALL_SORTED`, the `h2::Connection` send path), names that `generate-classes.ts` emits (`host_fn_setter`, `host_fn_this_value`), a FreeBSD-only user (`O::EVTONLY`), the `__IsFreeze` autoref const, and errno or fault-injection tables that mirror C. - A mark-and-sweep over the relocations of the `-O0 -ffunction-sections` debug objects for C++. Almost every hit is in a function that one of the open pull requests already deletes. - A per-binding comparison of every native object and `*.classes.ts` member that built-in JS consumes against `src/js`, `packages/bun-types` and `test/`. Self-reviewed: three changes requested, all made. The other four `Http2Response` stubs and `socketData` go too, three more `allocationSize` copies go too, and the `sys/Error.rs` entry is back. Found, not deleted here: - `"sys/Error.rs"` in `rustIdentifierPaths` (`src/codegen/generate-js2native.ts`): no `$newRustFunction` call site on main since 2b3f660, but #40854 adds one. - `FrameworkFileSystemRouter.match` (the `bun:internal-for-testing` router binding, 67 lines with `route_to_json_inverse`): no user on main, but #40731 and #33232 add tests that call it. - `bun_core::strings::split_once`: no user, but #40824 deletes the adjacent `rsplit_once`. - The SQL `queries` getter is never read, so `queries_set_cached` never runs and `get_queries_array()` always returns `undefined`. The `if (queries)` branches in `onResolve*`/`onReject*` (`mysql.ts`, `postgres.ts`) and the `queries` argument of about 12 native call sites are dead. That is a refactor of the resolve path, not a deletion. - `NodeHTTPResponse.ref`: no JS caller, but `unref` has one, and a one-sided pair reads like a bug. - `MySQLConnection.ref`/`unref`: no caller, but `sql.classes.ts` generates both drivers from one loop. - 36 of the 48 `X_getter` functions that `WEBCORE_GENERATED_CONSTRUCTOR_GETTER` defines in `ZigGlobalObject.cpp` have no user. The macro also defines the live `XConstructorCallback`, so this needs a macro split. - `IDLByte`, `IDLShort` and `IDLLongLong` converters: never instantiated, but `src/codegen/bindgen.ts` can emit the type names. - `ERR_REDIS_INVALID_DATABASE` in `ErrorCode.ts`: no user, but three open pull requests edit the adjacent lines. - `internalBinding("quic")` constants that `quic.ts` does not read: the object mirrors Node's list and is returned whole. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 2 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/run/run-crash-handler.test.ts <!-- robobun:evidence:end -->
This was referenced Sep 17, 2026
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Jarred-Sumner
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Sep 25, 2026
… the build scripts (#43778) ### Problem - A few C++ and TypeScript items have no caller, no producer, or no effect. - `BUN_MESSAGEPORT_USES_PIPE` (`src/jsc/bindings/webcore/MessagePort.h`) is always `1`. The `#if` around all of `MessagePortPipe.cpp` never excludes anything. ### Fix - WebView: remove `WebViewProto::Reader::u16()` and `f32()` (`ipc_protocol.h`), which have no caller. Remove the CDP `Method` values `RuntimeEnable`, `TargetCloseTarget` and `InputDispatchScrollEvent` with their `case` labels (`ChromeBackend.{h,cpp}`). No pending entry carries them. - WebCore bindings: remove the `BUN_MESSAGEPORT_USES_PIPE` define and guard, the self-alias of `ExtendedDOMClientIsoSubspaces`, the forward declaration of `URLPatternUtilities::URLPatternInit` (no such type), the enumerators `PerformanceEntry::Type::Paint` and `CastedThisErrorBehavior::ReturnEarly`, and 13 lines of commented-out WebKit code. - Build scripts: remove `getBuildNumber()` (`.buildkite/ci.ts`) and `BunOutput.rustObjects` (`scripts/build/bun.ts`). Nothing reads either. - Verified: `rg -w` for each symbol over `src`, `packages`, `scripts`, `test` and `build/debug/codegen` finds no other use. `bun bd` passes. The Notes list the tests. ### Background - `ipc_protocol.h` is the wire format between bun and the WebView host process. `Reader` decodes frames. Every caller uses `u8`, `u32`, `bytes` and `str` only. - `ChromeBackend` tags each pending Chrome DevTools Protocol command with a `Method`, so that the response handler knows which promise to settle. A value that no pending entry carries cannot reach the `switch`. - #29937 added the guard so that `MessagePortPipe.cpp` compiled to nothing while a verification step reverted `MessagePort.h`. Both files are on main now. ### Downsides - None found. Checked each removed symbol for users in C++, Rust, generated code and `src/symbols.*`. The removed enum values are in-memory tags or template arguments. Rust mirrors neither enum. <details><summary>Notes</summary> Smoke tests with the debug build, all pass: `test/js/web/workers/message-port-pipe.test.ts`, `message-channel.test.ts`, `performance-observer-leak.test.ts`, `test/js/node/perf_hooks/perf_hooks.test.ts`, `test/js/web/urlpattern/`, `test/js/bun/webview/webview-chrome-pipe.test.ts`. `clang-format` and `prettier` report no change on the touched files. `.buildkite/ci.ts` still transpiles. Each removal was checked against the diffs of the 34 open dead-code PRs. None of them removes the same lines. `MessagePort.h` is also touched by #40525, in a different hunk. How the Rust side was scanned, and why this PR has no Rust in it: - `cargo mordant` at the revision pinned in `.github/workflows/rust-lints.yml`, over the Linux, Windows and macOS targets, with the `unused_pub` entries taken out of the baseline. It reports 188 `pub` items that nothing in the workspace uses. Every function, method and struct in that list is in one of four groups: an open PR already removes it, a `cfg` that the run does not build uses it (`bun_zstd::inflate_embedded*` under `bun_codegen_embed`, `StoredTrace::from` in `PackageInstall.rs`), only a unit test uses it (`CowSliceZ::init_dupe`), or #42119 left it on purpose (`host_fn_this_value`, `host_fn_setter`, `JsClass::estimated_size`). The constants are flag, errno and syscall-tag tables. - A rust-analyzer SCIP index for five targets (Linux, Windows, macOS, FreeBSD, Android) plus a reachability closure over it. Two blind spots make it unreliable alone: rust-analyzer sets `cfg(test)` by default, which hides `src/runtime/bin_entry`, and references that come from a `macro_rules!` body are not indexed (`comptime_string_map!`, the CSS `to_css` bridges). With those corrected, it agrees with mordant and adds nothing. - Cargo's own `unused_dependencies` warnings: 9 edges. Each is used on another target, or #40294 already removes it. - Rust files outside every module tree: none. Headers that nothing includes: none (the remaining ones come in through `GeneratedJS2Native.h`, `NativeModuleImpl.h` or `include_bytes!`). Also scanned and clean: `src/js/{node,internal,bun,thirdparty}` and `src/js/builtins` (all 50 builtins and all 177 private names have a user), `scripts/`, `misctools/`, `.buildkite/ci.ts`, and the C++ under `webcore/`, `webcrypto/`, `node/` and `src/runtime/` that no open PR touches. Probably dead, left alone on purpose: - `bun_core::strings::split_once` (`src/bun_core/string/immutable.rs`): no caller on any target. It sits next to the hunk in which #40824 removes `rsplit_once`, so a removal here would conflict with that PR. - The raw-list `myersDiff` export of `src/js/internal/assert/myers_diff.ts` and the `Output::List` path behind it in `src/runtime/node/node_assert.rs` (about 115 lines): nothing consumes it. #39924 kept the export on purpose, and Node's own `test-assert-myers-diff.js` needs it if that test is vendored. - `BuiltinName::{redirect, asyncIterator, name, default, fatal, ignoreBOM}` (`src/jsc/lib.rs`, mirrored by position in `bindings.cpp`): never constructed. A removal conflicts with #40232. - `FetchHeaders` guard handling (`removePrivilegedNoCORSRequestHeaders` and the `Guard::Immutable` checks): every construction site passes `Guard::None`, and #43644 removes `setGuard`. This is unreachable code, not unreferenced code. - `ServerTiming`'s constructor and its `durationSet` / `descriptionSet` fields: nothing constructs a `ServerTiming`. #40122 and #41385 touch the same cluster. - The `$isPromiseFulfilled`, `$isPromiseRejected` and `$alwaysInline` codegen macros: no user since 92459cd. - `scripts/build/config.ts` flags `logs` and `baseline`: parsed and printed, never read since the Rust rewrite. `NestedCmakeBuild.{extraCFlags, extraCxxFlags, libSubdir, sourceSubdir, pic}`: no dependency sets them, but `scripts/build/deps/README.md` documents them as the API for future dependencies. - `misctools/gen-unicode-table.ts` and `unicode-generator.ts` emit Zig. Nothing references them, but `src/bun_core/string/identifier.rs` still names the generator as the way to rebuild its tables. - `completions/bun-cli.json` and `misctools/generate-cli-completions.ts`: nothing in the repository reads the JSON. It is still updated by hand, so something outside the repository may use it. </details>
Jarred-Sumner
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Sep 25, 2026
### Problem - `hasExportStar` in `src/runtime/bake/hmr-module.ts` has no caller. Its only call site is a block that #18109 commented out on 2025-03-14. The `availableExportKeys` local above that block is read only by the commented-out code. - `firstConnection` in `src/runtime/bake/client/websocket.ts` is assigned once and never read. - No lint reports them. Earlier sweeps ran `tsc --noUnusedLocals` over `src/js` and `scripts` only, not over `src/runtime/bake`. ### Fix - Delete `hasExportStar`, the commented-out check, `availableExportKeys`, and `firstConnection`. 2 files, 40 lines removed. - Correct because the bundler already drops `hasExportStar`. The generated `bake.client.js`, `bake.server.js` and `bake.error.js` differ from `main` only by the two removed local declarations. - Verified: `tsc -p src/runtime/bake/tsconfig.json --noUnusedLocals` no longer reports either file. `test/bake/dev/esm.test.ts` (17 pass), `hot.test.ts` (11 pass) and `bundle.test.ts` (23 pass) with the debug build. Behaviour change: none ### Background - `hmr-module.ts` is the module loader that the dev server sends to the browser and to the SSR realm. `parseEsmDependencies` walks the dependency list of an ES module. Each entry carries the export names that the importer uses. - The removed check compared those names with the exports of the dependency and threw a `SyntaxError` for a missing one. It has been off for 18 months. A missing export fails at the use site. - A deletion has one possible place, so no other design was weighed. ### Downsides - The commented-out check was the only sketch of export verification in the HMR runtime. A person who wants to build it starts from the history of #18109. <details><summary>Notes</summary> #### Why this run is small Every other hit of this run is live, is platform code with a user on another target, or is a line that one of the 34 open dead-code pull requests already deletes. Each removed line here was checked against those diffs. #40492 and #43378 touch `websocket.ts` in other hunks. #### Scans of this run, all clean or already claimed - Debug objects linked again with `--gc-sections --print-gc-sections`, then `llvm-symbolizer` for `file:line`. 20,668 discarded functions in bun's objects. The Rust ones outside macros and trait impls are Windows or macOS helpers, or claimed (#40824, #40557, #40232). The C++ ones are claimed, are template instantiations, or have a Rust caller on another target (`bsd_socket_export`, `posix_spawnattr_reset_signals`). - Rust functions that never get a symbol (generic or `#[inline]`, never instantiated), found by comparing every `fn` line with the DWARF declaration lines of all emitted functions. 86 hits outside `cfg`, trait impls and `#[inline(always)]`. All are Windows-only, test-only (the outbound half of `api/bun/h2/connection.rs`), or claimed. - `clang -fsyntax-only -Wunused-function -Wunused-macros -Wunused-template -Wunused-member-function` over 588 translation units and the 69 unified ones (the build passes `-Wno-unused-function`). 3 functions and 6 macros. `formatStackTraceToJSValueWithoutPrepareStackTrace`, `hostName`, `G_TRUE`, `G_FALSE`, `MAX_LABELS` and `us_ioctl` are claimed (#40367, #43378, #40492, #40294). `us_quic_send_one` is used under the non-Linux `#if` branch. - A whole-program C++ reference index (`c-index-test -index-file`, 657 translation units, 32,018 symbols declared in bun's tree). 8,711 have no recorded reference. After filters for template-dependent uses, `extern "C"`, virtual methods and names that WebKit headers use, 78 remain. All are index artifacts (typedef struct tags, primary templates with used specializations, `requires` clauses) or one-line getters in files that open pull requests rewrite. - `tsc --noUnusedLocals` over `src/js`, `scripts`, `src/codegen`, `src/runtime/bake`, `src/node-fallbacks` and the sources of each package. The hits outside this change are claimed (#40122, #41169, #41385, #40492, #43778) or are loop variables. - Regex scans for struct fields with no read and for `bool` or `Option` fields that only ever get one constant. Nothing new after #43745. - Exports of `src/js` modules and builtin functions with no mention in another file: none. - Files that nothing includes, imports or names: none outside `.idl` copies (#41064). `src/symbols.txt`, `symbols.def` and the `package.json` scripts name nothing that is gone. No `#if 0`. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 1 · the description declares no behaviour change, so there is no failing test to prove; the existing suite in CI is the check <!-- robobun:evidence:end -->
Jarred-Sumner
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Sep 26, 2026
… and the CI pipeline script (#43976) Behaviour change: none ### Problem - Eleven files hold items that nothing reads or calls: write-only fields, an uncalled method, four unused types, and CI options that are parsed and dropped. - No tool reports them. C and C++ have no dead-code lint. TypeScript counts `x += n` as a read. The Rust types come from a macro. ### Fix - TypeScript: remove `DataViewReader.u16()`, `DataViewWriter.capacity`, the `totalCount` local in `updateBuildErrorOverlay`, and a commented-out block from 2024 in `src/js/node/dgram.ts`. - C and C++: remove `us_udp_socket_t.connected`, `us_quic_stream_s.headers_delivered` and `Http2ResponseData::totalSize` (each is only written), and `#undef FD_BITS` (nothing defines it). - Rust and CI: remove the opaque types `us_loop_t`, `us_socket_context_t`, `us_udp_socket_t`, `us_udp_packet_buffer_t` from `src/uws_sys/lib.rs`. In `.buildkite/ci.ts`, remove `dryRun`, `Platform.features`, four emoji entries, and the union members `"amazonlinux"` and `"eol"`. - Verified: `rg -w` for each symbol over `src`, `packages`, `scripts`, `test` and `build/debug/codegen` finds no other use. `bun bd`, `bun run rust:check-all` (12 targets) and `tsc` pass. Self-reviewed: 1 concern raised, 1 addressed. ### Background - `DataViewReader` and `DataViewWriter` decode and encode the binary messages between the dev server and its browser client. - `us_udp_socket_t` and `us_quic_stream_s` are private C structs of uSockets. Rust holds them as opaque pointers, so no Rust struct mirrors their layout. - `bun_core::opaque_extern!` declares a zero-sized Rust type for a C struct. Rust code names `Loop`, `udp::Socket` and `udp::PacketBuffer`, not the four removed types. ### Downsides - None found. Checked each removed symbol for users in Rust, C, C++, TypeScript, generated code, tests, and open pull requests. <details><summary>Notes</summary> **Evidence per removal** | Item | Evidence | | --- | --- | | `DataViewReader.u16()` | `rg '\.u16\('` over `src/runtime/bake`, `test/bake`, `test/cli/inspect`: no hit. | | `DataViewWriter.capacity` | The only hit of `.capacity` in the bake TypeScript is the assignment in the constructor. `initCapacity` is the only caller of the constructor. | | `totalCount` | Two hits: the declaration and one `+=`. | | `dgram.ts` block | `git blame`: 589f941, 2024-04-26. `replaceHandle` and `startListening` are not defined in the file. | | `us_udp_socket_t.connected` | Two hits, both `udp->connected = 0;`. | | `us_quic_stream_s.headers_delivered` | Two hits in `quic.c`: the field and one `= 1`. The struct is private to `quic.c`. | | `Http2ResponseData::totalSize` | One member access: `data.totalSize = totalSize;`. The other hits of `totalSize` are the function parameter. | | `#undef FD_BITS` | The only hit of `FD_BITS` in `src` and `packages`. | | Four opaque types | Each name has one non-comment hit in all Rust sources and generated Rust: the macro call. | | `dryRun` | Four hits in `ci.ts`: the field, two assignments, one destructure. Nothing reads the binding. | | `Platform.features` | One hit. | | Emoji, `Distro`, `Tier` entries | No platform in `ci.ts` or image in `scripts/build/ci-images/spec.ts` carries them. `Emoji` is `keyof typeof emojiMap`, so a remaining caller would fail `tsc -p scripts/tsconfig.json`. It passes. | **Taken out because an open pull request uses or removes the item** - `DataViewWriter.u8()`: dead on main, but #42075 adds its first caller (`check.u8(IncomingMessageId.check_errors)` in `hmr-runtime-error.ts`). Git merges the two without a conflict, so the method stays. The tree that results from a merge of this branch with #42075 has no type error for `u8`. - `declare module "bun:wrap"` in `bake.private.d.ts`: no importer, but #39488 already has the same hunk. **Tests run with the debug build, all pass** `test/js/bun/udp/udp_socket.test.ts` (218), `test/js/bun/udp/dgram.test.ts` (62), `test/js/bun/http/serve-http2.test.ts` (93), `test/js/bun/http/serve-http3.test.ts` (73), `test/bake/dev/bundle.test.ts` (23), `test/bake/dev/esm.test.ts` (17), `test/bake/hmr-socket-protocol.test.ts` (4), `test/cli/inspect/BunFrontendDevServer.test.ts` (7). `test/js/node/dgram/node-dgram.test.js` passes 3 of 4: the IPv6 multicast test fails with `ENODEV` in the test container, with and without this change. `prettier` and `cargo fmt --check` report no change. **Overlap with open pull requests** Each removed line was compared with the diffs of the 35 open dead-code pull requests. None removes the same lines. Five files are also touched by an open pull request, in hunks more than 6 lines away: `internal.h` and `quic.c` (#40294, #42431), `dgram.ts` (#42431), `overlay.ts` (#43378, #42075, #39488), `src/uws_sys/lib.rs` (#43010). The added lines of the 122 open pull requests that were updated since 2026-09-18 and touch the bake, uSockets, uWS, uws_sys, server, socket or CI sources name none of the removed symbols. **What was scanned** - C and C++: the debug binary was linked a second time with `--gc-sections`, and the two symbol tables were compared. 414 functions in bun's own C and C++ are unreachable on Linux. Open pull requests remove 263 of them. The remainder is in the list below, has a caller on Windows or macOS, or comes from a macro. - Rust: 37 `#[no_mangle]` exports are unreachable in the Linux link. Each has a caller on another platform, or #40824, #40232 or #40557 removes it. A count of references for all 58,055 Rust definitions found no other item without a user. Of the 144 `allow` attributes for the unused and unreachable lints, each covers code that depends on `cfg` or is macro output. - Cargo: five dependency edges are unused on all 12 targets. #40294 removes three. `bun_resolver -> bun_zstd` is used under `cfg(bun_codegen_embed)`. `bun_wyhash -> bstr` is used by unit tests. - Preprocessor: `USE(BIGINT32)` and `ENABLE(MALLOC_BREAKDOWN)` are never true. #43644 and #40557 remove those branches. - Also scanned and clean: `src/js`, `src/node-fallbacks`, `src/codegen`, `scripts/`, `misctools/`, `patches/` (every patch file has a user), `packages/` except `bun-types`. **Probably dead, left alone on purpose** - The `PerformanceResourceTiming` cluster under `src/jsc/bindings/webcore` (about 2,000 lines: `PerformanceResourceTiming`, `PerformanceServerTiming`, `ResourceTiming`, `NetworkLoadMetrics`, `ResourceLoadTiming`, `ServerTiming` and the two JS wrappers). The linker drops every constructor, so no instance can exist. The two globals are public and `test/js/web/web-globals.test.js` checks them. This needs a decision: keep it for a future resource-timing implementation, or reduce it to the two constructors. - `WEBCORE_GENERATED_CONSTRUCTOR_GETTER` (`ZigGlobalObject.cpp`) emits an `X_getter` function for 50 classes. 45 have no user. A removal needs a second macro and saves no source lines. - The WebIDL converters for `byte`, `short` and `long long`, and most `Clamp` and `EnforceRange` specializations in `JSDOMConvertNumbers.cpp`. No binding uses them, but `src/codegen/bindgen.ts` maps `t.i8`, `t.i16` and `t.i64` to them. - `src/js/bun/sql.ts`: the export properties `sql`, `Query`, `postgres` and the four error classes. Native code reads only `default` and `SQL`. It is not certain that no loader path exposes the module object. - `us_nq_settings_set_scid_len` and `us_nq_settings_set_delay_onclose` (`node_quic_shim.c`, declared in `src/lsquic_sys/lib.rs`): no caller. `node:quic` is under active work. - `Event::currentTargetIsInShadowTree()` and its bit: no reader. The lines sit next to a hunk of #39929. - Bake client: `WebSocketWrapper.close()` and `[Symbol.dispose]()`, `streamingStarted`, the `line` and `column` bookkeeping and seven enum members in `JavaScriptSyntaxHighlighter.ts`, and `externals` in `src/node-fallbacks/build-fallbacks.ts`. Each sits next to a hunk of #43378, #40492, #40122 or #41385. - The `internal: true` property option of the class generator. A guard throws on it, so the branches behind it cannot run. Five open pull requests touch `generate-classes.ts`. - `H2App::getNativeHandle` (next to a hunk of #41195) and `uws_app_listen_config_t` (its last user goes with #42431). - `UWS_ALLOW_SHARED_AND_DEDICATED_COMPRESSOR_MIX`, `UWS_ALLOW_8_WINDOW_BITS` and `LIBUS_NO_SSL`: never defined, but they are documented opt-in switches of the upstream libraries. - `scripts/debug-coredump.ts`, `scripts/gamble.ts`, `scripts/github-metrics.ts`, `scripts/lldb-inline.sh` with `scripts/lldb-inline-tool.cpp`, and `packages/h3blast`: nothing references them. They read as tools that a person runs by hand. - #40232 removes `napi_internal_get_version`. #42556 renamed that function to `Bun__napi_get_version` on main, and it still has no caller. </details>
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Scheduled dead-code sweep. Net -576 lines (57 files, +65 / -641; the source side is +11 / -640, the rest is the test pin). Every item below has zero references left in
src/,packages/,scripts/,test/and the regeneratedbuild/debug/codegen/. The areas were picked to not overlap the open dead-code PRs (#39929, #40232, #40172, #40122): none of those touchpackages/bun-uws,packages/bun-usockets, or the files changed here.packages/bun-uws (-305)
Template methods that no translation unit instantiates. The only callers of the uWS C++ are
src/uws_sys/libuwsockets{,_h3}.cppand seven files undersrc/jsc/bindings/, so a method missing from both is unreachable.QueryParser.h: the whole file (getDecodedQueryValue), with its two includes. Its only callers wereHttpRequest::getQuery(key)andHttp3Request::getQuery()/getQuery(key), also removed, plus the now write-onlyHttp3Request::querymember.App.h:removeServerName,missingServerName,onMissingServerName,getNativeHandle, and themissingServerNameHandlercheck intrackListenSocket.HttpContextData.h: themissingServerNameHandlerfield. Bun'smissingServerNamepath goes throughus_listen_socket_on_server_namefrom Rust (src/uws_sys/ListenSocket.rs), never through the App.AsyncSocket.h:addressAsText,getRemoteAddressAsText, and theirusingre-exports inHttpResponse.handWebSocket.h(uws_res_get_remote_address_infore-implements this inline). Also the unusedusing Super::getRemoteAddressonHttpResponseandusing Super::getNativeHandleonWebSocket.HttpResponse.h:getWriteOffset,setWriteOffset,getSocketData.Http3Response.h:getWriteOffset,overrideWriteOffset,getSocketData.Http3ResponseData.h: the never-writtensocketDatafield.Http3App.h:constructorFailed,getNativeHandle.Loop.h:Loop::deferand the queue drain inwakeupCb.LoopData.h:deferMutex,currentDeferQueue,deferQueues, and the<mutex>,<thread>,<vector>includes they leave unused (Http3Context.hnow includes<vector>itself). Nothing ever deferred, so the callback drained empty queues.wakeupCbstays as a no-op becauseus_create_loopcalls the wakeup callback unconditionally and Rust still callsus_wakeup_loopto interrupt the poll.WebSocket.h:sendFirstFragment,sendFragment,sendLastFragment.WebSocketProtocol.h:ERR_INVALID_CLOSE_PAYLOAD, theCLIENT/SERVERenum,WebSocketState::SHORT_MESSAGE_HEADERandMEDIUM_MESSAGE_HEADER(the parser uses its own copies),SND_CONTINUATION,SND_NO_FIN, the emptyWebSocketProtocol()constructor,CONSUME_POST_PADDING,CONSUME_PRE_PADDING.AsyncSocketData.h:BackPressure::size().packages/bun-usockets (-156)
socket.c:us_socket_detach.context.c:us_socket_group_timestamp,us_socket_group_next,us_listen_socket_ext,us_listen_socket_port.crypto/openssl.c:us_listen_socket_find_server_name_userdata,us_listen_socket_find_server_name_ctx(its only caller wasonMissingServerNameabove). Their prototypes inlibusockets.h.quic.c/quic.h:us_quic_stream_flush,us_quic_stream_has_unacked,us_quic_socket_context,us_quic_pending_connect_user, theon_opencallback slot (setter, field, and the call inon_new_conn), and theuserparameter ofus_quic_socket_context_connect(only the removed getter read it). The Rust side (src/uws_sys/quic/Context.rs,src/http/h3_client/ClientContext.rs) drops the argument.fault_inject.c:us_fault_clear(Rust bindsus_fault_set,us_fault_clear_all,us_fault_hitonly).node_quic_shim.c:us_nq_spec_peer_ctxand itsexterndeclaration insrc/lsquic_sys/lib.rs.libusockets.h: prototypes with no definition anywhere:us_udp_socket_receive,us_udp_buffer_set_packet_payload,us_create_udp_packet_buffer,us_udp_socket_bind. Macros with no use:ALLOW_SERVER_RENEGOTIATION,POLL_TYPE_BITSIZE,POLL_TYPE_MASK(internal.h),SETSOCKOPT_PTR_TYPE(bsd.h),MAX_LABELS(sni_tree.cpp),us_ioctl(loop.c).Rust and C++ bindings (-74)
JSCommonJSExtensions__appendFunction,__setFunction,__swapRemove, them_registeredFunctionsvector and itsvisitChildren. Rust declared these (src/jsc/NodeModuleModule.rs) but never called them: customrequire.extensionsloaders are held asCustomLoader::Custom(Strong)on the Rust side.TopExceptionScope::clear_exception(Rust), itsexterndeclaration, andTopExceptionScope__clearException(C++). Callers useJSGlobalObject::clear_exception.Bun__linux_trace_close(src/bun_core/util.rsdeclaration and the definition inlinux_perf_tracing.cpp).bun_js_printer:Writer::flush, theWriterContext::flushdefault method, and theBufferWriterimplementations behind it. Nothing callsflushon a printer writer.Cargo manifests (-24, plus -29 in Cargo.lock)
23 dependency edges that no source file in the crate names (cargo-machete, confirmed with
rg; the only textual hits are comments):bun_bundlerconst_format;bun_bunfigenum-map;bun_collectionsstrum, thiserror;bun_crash_handlerscopeguard;bun_cssconst_format, enum-map, enumset, libc, typed-arena;bun_httpscopeguard;bun_inibun_js_parser;bun_installbun_uws;bun_iobun_opaque, bun_paths, const_format, enum-map;bun_js_printerconst_format, scopeguard;bun_jscbun_transpiler;bun_libuv_syslibc;bun_platformbun_core;bun_ptrscopeguard.typed-arenaleaves the workspace with its last user.Verification
rg -w <name>oversrc/,packages/,scripts/,test/andbuild/debug/codegen/for every removed symbol: only the definition matched.bun bdbuilds and links. The removed symbols are absent from the binary (nm).bun run rust:check-all: 12 of 12 targets pass.test/js/node/module/require-extensions.test.tsgains a pin for the path that replaces the removed registry: a custom handler that only the extensions table references survivesBun.gc(true), is the one the loader calls, is replaced on reassignment, and the.jsloader takes over once it is deleted.bun bd testontest/js/bun/http/serve.test.ts,bun-serve-ssl.test.ts,serve-http3.test.ts,test/js/web/fetch/fetch-http3-client.test.ts,test/js/node/http/node-http.test.ts,test/js/node/module/require-extensions.test.ts,test/js/bun/websocket/websocket-server.test.ts. The failures left are identical on a debug build of main without this diff (no IPv6 in the container, root can bind port 1003, the egress proxy, and four concurrentServerWebSocket > sendtimeouts under ASAN).Notes
CI on the rebased head (build 106974): 179 of 181 jobs pass. The two red lanes are failures that main has too and that this diff does not touch:
test/bundler/transpiler/macro-test.test.ts(a LeakSanitizer report fromnode_fs_binding::Bindingon the x64 ASAN lane) andtest/js/web/url/url.test.ts(the Unicode 16 IDNA case on macOS 14 x64). Both are reported for main-break triage. Every other entry in the build is a retry-passed flake.Rebased onto main after #40137 (HTTP/2 in
Bun.serve) landed. One conflict, inpackages/bun-uws/src/Http3Request.h: main turned the request into a shared decoded-header-list type (headers/headerCountmembers), this PR removes thequerymember next to them. Both kept. The newHttp2Responsehas its owngetWriteOffset/overrideWriteOffset/getSocketData; those are separate from theHttpResponse<SSL>andHttp3Responsemethods removed here and stay.What was scanned and came back clean, so the next run can skip it:
pubitems. 835 of them are FFI struct fields and OS constant tables in the_syscrates, which stay for layout or as code tables (and Remove dead code from the Windows bunx shim, bun_sys, libuv_sys, uws_sys, and the FFI wrapper crates #40172 owns those files). Of the rest, most are live undercfg(bun_debug)/cfg(debug_assertions)(StoredTrace::capture,debug_flags::has_resolve_breakpoint,TaskTag::name,PackageField::name), named by a codegen template (host_fn_this_valueingenerate-classes.ts), named inclippy.tomlas the sanctioned replacement (strings::split_once/rsplit_once), or mirror a C enum (tty::Mode::Io,NapiStatus,ImplementationVisibility,AsyncCallType).#[allow(dead_code)]site outsidesrc/runtime/api/bun/h2/(a rewrite in progress) is platform-, profile-, or test-gated with a matchingcfg_attr.#[no_mangle]Rust export is referenced from C++, WebKit, a linker wrap, or a macro-built name. Everyextern "C"declaration in Rust has a caller, except the five removed here. Everyuws_*shim insrc/uws_sys/libuwsockets{,_h3}.cppis declared from Rust..rsfile (the three unmounted files are registered criterion benches). No unreferenced codegen script.src/js/**was swept yesterday (Remove dead code from bun-uws, the native BufferList class, built-in JS, the bake dev server assets, the shell, and the SQL crates #40066) andoxlintenforcesno-unused-varsthere.UWS_ALLOW_*andLIBUS_USE_WOLFSSLconfiguration toggles, theMoveOnlyFunction.hspecializations (vendored third-party code),us_socket_t.ssl_is_server(write-only bit in a struct whose layout Rust sizes), the constant feature flags insrc/bun_core/feature_flags.rs(VERBOSE_FS,HARDCODE_LOCALHOST_TO_127_0_0_1: deliberate switches), andbun_errno::posix::mode_t/windows_errno::posix::E(cross-platform path aliases).TemplatedApp::run/uWS::run()/Loop::run()/ theuws_app_runshim are reachable only frombun_uws_sys::App::run, which has no caller (that file is in Remove dead code from the Windows bunx shim, bun_sys, libuv_sys, uws_sys, and the FFI wrapper crates #40172).Http3Response::onTimeoutis set byuws_h3_res_on_timeoutbut never fired.[review] gate passed · iteration 1 · 59 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 4 passed · 1 rejected · iteration 1
evidence per changed file