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Additional findings (outside the current diff — GitHub can't attach inline comments there):
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src/jsc/DeprecatedStrong.rs— nit:SafetyData.ref_countis now dead — after removingunref()(and with noref()method), it is initialized to 1 ininit()and only ever asserted== 1inDrop; per REVIEW.md the field should be deleted in the same PR that removes its last mutatorExtended reasoning...
No user-visible failure relative to base; this is dead-code cleanup left incomplete. The
ref_count: u32field and itsdebug_assert!(ref_count == 1)add an unused word to every debug-build canary and misleadingly imply a refcount contract that no longer exists — the fix is to drop the field (and the assertion) soSafetyDatais just the canary pointer.Verification: nit — The diff removes
unref()(the only mutator ofref_count; base had noref()either — seegit show 731aa92:src/jsc/DeprecatedStrong.rs, only lines 84/102 touched it). After the change,ref_countis set to1at line 47 and only ever read bydebug_assert!(_safety.ref_count == 1)at line 72 — an assertion that can never fail. The field, the vacuous assert, and the stale… | nit —…
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Pro Run ID: 📒 Files selected for processing (8)
💤 Files with no reviewable changes (3)
Included review availability: Your plan provides up to 5 included reviews per hour; 1 remains after this review. WalkthroughThis PR removes obsolete APIs, re-exports, bindings, flags, and helper code across install, JSC, runtime, Windows, and tooling. It also unifies Windows named-pipe compilation and adds a repository-wide redundant- ChangesRepository cleanup and API reduction
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Inline comments:
In `@src/runtime/socket/WindowsNamedPipeContext.rs`:
- Around line 417-420: Remove the Windows-only cfg gates around the
ActiveHandle::WindowsNamedPipe enum variant and its teardown match arm in
jsc_hooks.rs, so all targets can resolve and handle the variant now registered
by create. Then run the cross-target Rust check.
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Fix all unresolved CodeRabbit comments on this PR:
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📒 Files selected for processing (53)
packages/bun-inspector-protocol/.gitignorepackages/bun-inspector-protocol/scripts/generate-protocol.tspackages/bun-inspector-protocol/src/protocol/v8/index.d.tspackages/bun-inspector-protocol/src/protocol/v8/protocol.jsonpackages/bun-release/scripts/upload-npm.tsscripts/bootstrap.shsrc/CLAUDE.mdsrc/bun_core/lib.rssrc/bundler/defines.rssrc/bundler_jsc/lib.rssrc/install/PackageManager/PackageManagerOptions.rssrc/install/PackageManager/UpdateRequest.rssrc/install/PackageManager/install_with_manager.rssrc/install/build.rssrc/install/dependency.rssrc/install/lockfile/Package.rssrc/install_types/lib.rssrc/js/internal/shared.tssrc/js_printer/renamer.rssrc/jsc/DeprecatedStrong.rssrc/jsc/JSBigInt.rssrc/jsc/JSCScheduler.rssrc/jsc/URL.rssrc/jsc/bindings/BunDebugger.cppsrc/jsc/bindings/BunJSCEventLoop.cppsrc/jsc/bindings/BunObject.cppsrc/jsc/bindings/BunString.cppsrc/jsc/bindings/JSBigIntBinding.cppsrc/jsc/bindings/JSBuffer.cppsrc/jsc/bindings/JSEnvironmentVariableMap.cppsrc/jsc/bindings/ScriptExecutionContext.cppsrc/jsc/bindings/ScriptExecutionContext.hsrc/jsc/bindings/headers.hsrc/jsc/event_loop.rssrc/jsc/virtual_machine_exports.rssrc/jsc_macros/lib.rssrc/perf/system_timer.rssrc/runtime/cli/test/parallel/Channel.rssrc/runtime/dns_jsc/dns.rssrc/runtime/dns_jsc/mod.rssrc/runtime/jsc_hooks.rssrc/runtime/node/uv_signal_handle_windows.rssrc/runtime/socket/WindowsNamedPipe.rssrc/runtime/socket/WindowsNamedPipeContext.rssrc/runtime/timer/Timer.rssrc/runtime/valkey_jsc/mod.rssrc/runtime/webcore/Blob.rssrc/runtime/webcore/CookieMap.rssrc/sql_jsc/lib.rssrc/sys/windows/mod.rssrc/threading/Futex.rssrc/url/lib.rssrc/windows_sys/externs.rs
💤 Files with no reviewable changes (29)
- packages/bun-inspector-protocol/.gitignore
- src/jsc/bindings/ScriptExecutionContext.h
- src/runtime/dns_jsc/dns.rs
- src/install/PackageManager/UpdateRequest.rs
- packages/bun-release/scripts/upload-npm.ts
- src/bun_core/lib.rs
- src/install/lockfile/Package.rs
- src/jsc/virtual_machine_exports.rs
- src/jsc/bindings/ScriptExecutionContext.cpp
- src/js/internal/shared.ts
- src/jsc/bindings/headers.h
- src/jsc/bindings/BunDebugger.cpp
- src/jsc/event_loop.rs
- src/runtime/node/uv_signal_handle_windows.rs
- src/jsc_macros/lib.rs
- src/runtime/webcore/CookieMap.rs
- src/jsc/bindings/JSBuffer.cpp
- src/jsc/bindings/JSBigIntBinding.cpp
- src/jsc/bindings/BunJSCEventLoop.cpp
- src/jsc/bindings/BunObject.cpp
- src/jsc/bindings/BunString.cpp
- src/runtime/webcore/Blob.rs
- src/install/PackageManager/PackageManagerOptions.rs
- scripts/bootstrap.sh
- src/js_printer/renamer.rs
- src/jsc/JSCScheduler.rs
- src/sys/windows/mod.rs
- src/threading/Futex.rs
- src/jsc/bindings/JSEnvironmentVariableMap.cpp
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Review follow-ups, in d658b0f and f46dabc:
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Updated 9:21 PM PT - Aug 27th, 2026
❌ @robobun, your commit 8d2a327 has 2 failures in
🧪 To try this PR locally: bunx bun-pr 40557That installs a local version of the PR into your bun-40557 --bun |
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Thanks — all four nits from earlier rounds are addressed (unconditional rerun-if-changed in build.rs, flattened blocks + comment in WindowsNamedPipe.rs, not(not(P)) unwrap in the lint, and the orphaned src/protocol/v8/ snapshot deleted). I didn't find anything further, but given the breadth of the sweep a human pass over the "actually dead" claims is still worthwhile.
What was reviewed:
- Redundant
#[cfg(...)]removals inside already-gated Windows/posix modules — spot-checked mounts against the new lint's discovery logic. - FFI/extern deletions (
JSBigIntorder variants,BunString,ScriptExecutionContext,headers.h) — grepped for remaining Rust-side callers, none found. ExportRenamer, wasm32 Futex arm,DeprecatedStronghelpers,Channelunused methods — no references remain.- The new source-lint test's cfg-attribute parser and mount-predicate intersection logic.
Extended reasoning...
Overview
This PR is a broad dead-code sweep: it removes ~33k lines across 58 files, dominated by the deletion of the checked-in V8 inspector protocol snapshot (~32.6k lines of generated .d.ts/.json) and its generator branch. The remaining ~600 net-removed lines strip unused Rust items (ExportRenamer, BigIntOrderable, wasm32 Futex backend, DeprecatedStrong convenience methods, Channel iteration helpers), delete their matching C++ extern "C" bindings, and drop redundant #[cfg(windows)] / #[cfg(not(windows))] attributes on items inside modules that are already mounted under that same predicate. A new test/internal/source-lints/cfg-gated-module-redundant-cfg.test.ts enforces the last category going forward, and src/CLAUDE.md gains a note pointing at it.
Security risks
None identified. The change is purely subtractive plus a lint test; no new input parsing, no auth/crypto/permission surfaces touched. The only path-handling change is src/install/build.rs, which now writes a 0-byte placeholder into the crate's own windows-shim/ directory during Windows builds — build-time only, path derived from CARGO_MANIFEST_DIR, not user-controlled.
Level of scrutiny
Medium-high. Each individual removal is mechanical, but the correctness of a dead-code PR rests entirely on the claim that every removed item truly has no remaining consumer — including cfg-gated code, generated bindings, and cross-language FFI where the compiler won't catch a stale reference. I spot-checked the FFI deletions (JSBigInt order variants, BunString/ScriptExecutionContext externs) against the Rust side and found no remaining callers, and verified the cfg removals sit inside modules whose every mod declaration is gated by the same predicate. That said, 58 files across install, JSC bindings, threading, Windows sockets, and the bundler is more surface than an automated pass should sign off on alone.
Other factors
Over six earlier review rounds I raised four nits; each was addressed by a follow-up commit (d658b0f, f46dabc, 7c6ef93, bb645c9, b013962), and I re-verified all four fixes against HEAD in this run. The final commit 89f6c096 is an empty CI retrigger. The new lint test gives ongoing coverage for the cfg-redundancy class, but there is no test asserting the removed C++/Rust symbols were unused — that verification is inherently grep-and-compile, which is why a human skim of the removal list is the remaining ask.
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…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>
…stall, and the Windows named pipe modules Delete the generated V8 devtools protocol types in bun-inspector-protocol (nothing imports them, the package exports only JSC) and the generator's --v8 path. Remove Rust items that no crate references (ExportRenamer, Channel::close, DeprecatedStrong::unref, URLJsc::from_js, two unused BigInt order FFI wrappers, Bun__Timer__getNextID, Bun__tickWhilePaused, Bun__getVerboseFetchValue, the install build.rs generator whose output nothing includes, two never-read install bitflags, unused Win32 declarations, and dead re-exports). Drop cfg(not(windows)) stubs inside modules that are mounted under cfg(windows), wasm32 branches (no wasm target exists), and C++ blocks behind macros that are never defined.
…ning ones test/internal/source-lints/cfg-gated-module-redundant-cfg.test.ts resolves every top-level `mod` item under src/ to its file and fails when a module that is only mounted under `#[cfg(P)]` contains an outer `#[cfg(P)]` or `#[cfg(not(P))]`. rustc strips those arms before dead_code analysis, so they are never reported. The lint found four more files with the same pattern: path_watcher.rs (15 redundant `#[cfg(not(windows))]`), win_watcher.rs (a compile_error! guard that can never fire), BinLinkingShim.rs (a dead `not(windows)` arm), and bun_core/windows_sys.rs (a redundant `#[cfg(windows)]`). Also drop the now write-only `SafetyData::ref_count` in DeprecatedStrong and keep an unconditional `cargo:rerun-if-changed` in install/build.rs so cargo does not fall back to rerunning it on every crate change.
A stash round-trip restored the two generated files in the working tree and 7c6ef93 picked them back up.
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CI status at 8d2a327 (rebased on main): two lanes are red, neither from this diff.
Both are reported to main-break triage. Every other lane is green or passed on retry. The diff is ready for review. |
alii
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Sep 8, 2026
…llections, and three JS builtins (#42069) ### Problem - 25 dead-code PRs are already open, so a name grep finds little that is unclaimed. This run used the compiler instead: demote each `pub` item to `pub(crate)` and let rustc's `dead_code` lint say what nothing uses. - What survived that check on all nine CI target triples, and is not already in an open PR, is the list below. ### Fix - `bun_runtime::Error`: remove 14 variants that nothing constructs (`FmtError`, `ERR_TLS_CERT_ALTNAME_INVALID`, `ConnectionClosed`, `MissingCredentials`, `InvalidMethod`, `InvalidEndpoint`, `InvalidSessionToken`, `SignError`, `MissingPackageJSON`, `MissingEntryPoint`, `lcovCoverageError`, `CompilationFailed`, `JSErrorObject`, `Unsupported`), their `name()` arms, the two match arms that tested for them (`cli/mod.rs`, `jsc_hooks.rs`), and a `cfg(not(macos))` block inside a `cfg(macos)` function in `webview/HostProcess.rs`. - `bun_jsc`: remove `CrateError::JSErrorObject` (its only producer was the arm above) and the three never-called `HotReloadTaskView` methods. The trait stays as the type-erasure marker that `HotReloaderCtx::reload` takes. - `bun_collections`: `StringHashMap::values_mut` has no caller in any crate. - JS builtins: a 23-line commented-out `fileURLToPath` in `node/url.ts` (unchanged since 2025-01), the unused `format` / `formatWithOptions` getters in `internal/repl/node-inspect.js`, and the unused `reportUncaughtException` export in `internal/shared.ts`. - Verified: `cargo check --workspace` on all nine triples from `rust:check-all`, `bun bd`, then `repl.test.ts`, `readline.node.test.ts`, `hot.test.ts`, `watch.test.ts`, and the `node/url` tests. ### Background - The workspace denies `dead_code` and `unreachable_pub`, so rustc already rejects unused private items. The blind spot is a `pub` item that is reachable from its crate root but that no other crate imports. Demoting it to `pub(crate)` puts it back under the lint. - A demoted inherent method can silently lose to a trait method of the same name in other crates (`Blob::finalize` against the blanket `JsFinalize`, `__IsFreeze::IS_FREEZE` against `__NotFreeze`). rustc then reports the inherent item as dead while behavior changed. Every method hit was checked for a same-named path in other crates and those were left alone. <details><summary>Notes</summary> - Scope: 87 Rust crates (everything under `src/` except the proc-macro crates), `src/js`, the C++ `extern "C"` definitions in `src/jsc/bindings`, `Cargo.toml` dependencies, and orphan `.rs` files (via cargo dep-info). No unused dependencies and no orphan files were found. - Found dead but already removed by an open PR, so not repeated here: the `bindgen.rs` marker structs and `ExportRenamer` (#40915, #40557), the `uws_sys`/`mimalloc_sys`/`lsquic_sys` externs (#40172), `has_termination_request`, `clear_exception`, `from_typed_array`, `INTERNAL_MODULE_REGISTRY_FLAG`, and the 20 orphaned C++ `extern "C"` functions (#40232). - Probably dead, left out of the diff: 119 never-constructed `Feature` variants in `src/css/prefixes.rs` (the file is generated by `build-prefixes.js`), the never-constructed `bake::Mode::ProductionDynamic`, and several struct fields rustc reports as never read that exist to own an allocation (`JSTranspiler::arena`, `CurrentBundle::{bv2, heap, ast_alloc_state}`). - rustc's lint misreports inherent associated types (`ThreadPool::Worker`, `EntryPoint::Kind`) as unused. They are used and were kept. - `bun_core::strings::split_once` (the multi-byte variant) has no caller, but `clippy.toml` names it as the replacement for `str::split_once` and `bstr`'s `split_once_str`, so it stays. </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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Problem
packages/bun-inspector-protocol/src/protocol/v8/holds 32,610 lines of generated V8 devtools protocol types and JSON. Nothing imports them:src/protocol/index.d.tsexports onlyJSC, and no file in the repo referencesprotocol/v8or theV8namespace. The files were last regenerated in January 2024.pubitems that no crate uses (rustc'sdead_codelint cannot see across crates), FFI exports with no C++ caller,cfg(not(windows))stubs inside modules that are only mounted undercfg(windows),wasm32branches (Bun has no wasm target), and C++ blocks behind macros that nothing defines.Fix
--v8path ofscripts/generate-protocol.tsthat produced it.JSBigInt::order<T>), it now takes the one type that is used (i64).#[cfg(windows)]insocket/mod.rs, so every#[cfg(not(windows))]arm inside them was never compiled, and every inner#[cfg(windows)]attribute was redundant.rg -wfor each symbol acrosssrc/,packages/,scripts/, andbuild/debug/codegen/returns only the definition.bun bdbuilds.bun run rust:check-allpasses on all 12 targets.test/cli/inspect/bun-inspector-protocol.test.ts,test/bundler/bundler_splitting.test.ts,test/cli/install/bun-lockb.test.ts, the nodetest-fs-read*-position-validationtests,test/js/bun/test/{test-test,describe}.test.ts, and the blob and timer tests pass.Background
dead_codeandunreachable_pub, so an unused item survives only when it ispuband reachable from a crate root, or when it is an FFI root (#[no_mangle],// HOST_EXPORT(). This sweep checked those two classes by hand.generated_host_exports.rsis scraped from// HOST_EXPORT(markers at build time, so removingget_verbose_fetch_valuetogether with its marker removes the export cleanly.Removed symbols
packages/bun-inspector-protocol
src/protocol/v8/index.d.ts,src/protocol/v8/protocol.json(32,610 lines): not exported bysrc/protocol/index.d.ts, no importer.scripts/generate-protocol.ts:downloadV8,download<V>,includeV8, the--v8write block..gitignore: the staleprotocol/v8entry.bun_js_printer
renamer.rs:ExportRenamerand its impl (81 lines). The last caller left in bundler: one bundle-wide name per cross-chunk binding (no moreexport {x as y}/import {y as z}between chunks) #40518. Also thestd::io::Writeimport it needed and awasm32arm incompute_initial_reserved_names.bun_jsc / bun_jsc_macros / C++ bindings
DeprecatedStrong::unrefand theenable_safety!macro whose only use was aconst _that existed to silence its own unused warning.URLJsc::from_js, theURL__fromJSextern and its C++ body inBunString.cpp, andParsed::from_rawinbun_url(onlyfrom_jscalled it).src/CLAUDE.mdupdated.BigIntOrderableimpls forf64andu64, theJSC__JSBigInt__orderDouble/JSC__JSBigInt__orderUint64externs and C++ bodies.JSBigInt::ordernow takesi64, the only type ever passed (node_fs.rs).Bun__tickWhilePaused(JSCScheduler.rs),EventLoop::tick_while_paused, and the two C++ declarations inBunDebugger.cpp. The C++ callers were removed in e194566.get_verbose_fetch_value(Bun__getVerboseFetchValuehost export) and its declaration inJSEnvironmentVariableMap.cpp. No C++ call site.js_class_derive(#[proc_macro_derive(JsClassDerive)]): zero uses.BunObject.cpp:extern "C" bool has_bun_garbage_collector_flag_enabled;(the Rust static is never read from C++).JSBuffer.cpp:#if ENABLE(MEDIA_SOURCE)includes of headers that do not exist.ScriptExecutionContext.{h,cpp}:ENABLE(MALLOC_BREAKDOWN)branches (macro defined nowhere).BunJSCEventLoop.cpp:us_internal_monotonic_nsdeclaration (never called).headers.h:Bun__Timer__getNextIDdeclaration, and the#[no_mangle]Rust function inruntime/timer/Timer.rs. No caller on either side.bun_runtime
socket/WindowsNamedPipe.rs,socket/WindowsNamedPipeContext.rs,node/uv_signal_handle_windows.rs: all#[cfg(not(windows))]arms (open,connectstubs,()fields,falsetail blocks) and the redundant inner#[cfg(windows)]attributes.cli/test/parallel/Channel.rs:Channel::close(26 lines, no caller;Dropdoes the teardown inline).webcore/Blob.rs:BlobExt::transfer.webcore/CookieMap.rs:impl Clone for CookieMapRef(never cloned).dns_jsc: theInternalDNSRequestalias.valkey_jsc/mod.rs,sql_jsc/lib.rs: crate-root re-exports with no importer.bun_install / bun_install_types
build.rs: thedefault_trusted_dependencies_list.rsgenerator.lockfile.rshas usedinclude_bytes!on the text file since the Rust port, and nothinginclude!s the generated file.Do::PRINT_META_HASH_STRING(never set, so the three|| print_meta_hash_string()operands were always false) andDo::ANALYZE(set, never read;cli.analyzeis read directly).install_types/lib.rs: 33 crate-root re-exports nothing imports through the root.UpdateRequest.rs,lockfile/Package.rs,dependency.rs,bundler/defines.rs,bundler_jsc/lib.rs: dead re-exports.bun_windows_sys / bun_sys / bun_core
GetFileAttributesExW,GET_FILEEX_INFO_LEVELS,WIN32_FILE_ATTRIBUTE_DATA(and itsZeroableimpl inbun_core),FILE_INFO_BY_HANDLE_CLASS,LPSTR,FILE_BEGIN,FILE_ATTRIBUTE_TEMPORARY,SetStdHandle, and their re-exports insys/windows/mod.rs.bun_perf / bun_threading
system_timer.rs: thetarget_family = "wasm"Timerstub.Futex.rs:mod wasm_impland thewasm32ladder entries.Scripts and built-ins
scripts/bootstrap.sh:compare_version(unused since 2024-10).packages/bun-release/scripts/upload-npm.ts: a commented-out block from 2024-04.src/js/internal/shared.ts: thereportUncaughtExceptionexport key (no importer uses it).Notes
Checked and left in place:
src/runtime/api/bun/h2/: the in-progress HTTP/2 engine rewrite carries#![allow(dead_code)]. Its outbound API (send_header_block,send_data,send_push_promise, about 160 lines) is reached only from its unit tests. Left for the owner of that work.scripts/gamble.ts,scripts/github-metrics.ts,scripts/lldb-inline.sh+lldb-inline-tool.cpp(no// LOG:comments remain insrc/),scripts/trace.sh,scripts/debug-coredump.ts. Nothing invokes them, but they are run by hand, so they are not deleted here.src/node-fallbacks/buffer.js:SlowBufferis defined and not exported. Node exports it, so the fix may be to export it rather than delete it.internal/validators.tskValidateObject*constants andinternal/dgram.ts_createSocketHandlehave no production caller but are reached by tests throughbun:internal-for-testing.scripts/generate-protocol.ts(it keeps the--v8path). Whichever lands second needs a small rebase.mockedFunctioninBunBuiltinNames.hlooks unreferenced torgbut is reached through token pasting inBunCommonStrings.cpp. Not dead.[review] gate passed · iteration 2 · 58 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 5 passed · 1 rejected · iteration 2
evidence per changed file