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…dings Drop Rust exports that no C++ code calls, C++ helpers that no Rust or C++ code calls, and the declarations that went with them: - Zig__GlobalObject__reportUncaughtException and VirtualMachine::report_uncaught_exception - Resolver__propForRequireMainPaths - the Bun__ConsoleObject__profile, profileEnd, record, recordEnd and screenshot no-op hooks (ConsoleObject.cpp never calls them) - BlobArrayBuffer_deallocator - WebCore__FetchHeaders__createValue and FetchHeaders::from - DOMFormData__toQueryString and DOMFormData::toURLEncodedString - Bun__CallFrame__isFromBunMain - NapiRef::clear - JSC__VM__hasTerminationRequest and VM::has_termination_request - the unused export names on parse_args and PostgresSQLConnection::call - strings::rsplit_once and the BUN_DUMP_STATE_ON_CRASH feature flag
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Updated 11:47 AM PT - Aug 28th, 2026
❌ @robobun, your commit 02780ce has 1 failures in
🧪 To try this PR locally: bunx bun-pr 40824That installs a local version of the PR into your bun-40824 --bun |
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WalkthroughChangesAPI and FFI cleanup
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Suggested reviewers: Merge Risk: 🔵 Low · up to The expanded export lint can misclassify symbols inside multiline block comments, allowing a dead export to evade enforcement or causing a false lint failure; this is a bounded non-runtime issue, so the PR is mergeable with owner follow-up. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Extend host-export-callers.test.ts from HOST_EXPORT markers to every hand-written export: #[no_mangle] items, #[export_name] items and #[host_fn(export)] / #[uws_callback(export)] shims. A symbol must be named outside a comment somewhere other than its own definition. Other Rust files count, so extern blocks in another crate keep a symbol alive. One PCRE alternation replaces one -e per symbol, which keeps the scan under a second. The lint found and this commit removes: - AbortSignal__Timeout__run (the timer fires through dispatch.rs) - the export names on Bun__HashObject__crc32 and the four Bun__NodeNet__*DefaultAutoSelectFamily* shims, which are reached through JSFunction::create and never by symbol - a #[no_mangle] fn named c in TextEncoder.rs, a duplicate of TextEncoder__encode16 with nothing calling it
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strings::rsplit_once is gone, so the deny reasons for str::rsplit_once, str::rsplitn and bstr::ByteSlice::rsplit_once_str now name rsplit_once_char and last_index_of. The bake harness no longer sets BUN_DUMP_STATE_ON_CRASH, which nothing reads.
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In `@test/internal/source-lints/host-export-callers.test.ts`:
- Around line 162-165: Update the source scanning logic around isComment so
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- src/jsc/AbortSignal.rs
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CI on 02780ce: the only lane that stays red is test/js/web/url/url.test.ts on darwin x64. It fails on main too (the Unicode 16 IDNA case needs ICU 76) and is with main-break triage. Every other failure in this run passed on retry or when run alone. The filesystem_router segfault from the previous run did not recur. |
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…misc sources (#40881) ### Problem - The C++ side of the Rust/C++ FFI still defines shims that no Rust code calls. The Rust side now implements `JSValue::is_int32`, `is_null`, `is_object`, `js_type`, and friends inline (`src/jsc/JSValue.rs`), but the `[[ZIG_EXPORT]]` / `CPP_DECL` functions they replaced stayed in `src/jsc/bindings/bindings.cpp` and `headers.h`, and `cppbind.ts` still emitted Rust wrappers for them. - `src/uws_sys/libuwsockets_h2.cpp` defines seven `uws_h2_res_*` C shims with no Rust declaration, and one (`uws_h2_res_override_write_offset`) whose only Rust wrapper nothing calls. ### Fix - Delete 21 functions from `bindings.cpp` and their 15 `headers.h` declarations: `JSC__JSValue__{isCell, isCustomGetterSetter, isGetterSetter, isInt32, isInt32AsAnyInt, isNull, isNumber, isObject, isUndefined, isUndefinedOrNull, jsNumberFromChar, jsNumberFromU16, jsTDZValue, jsType}`, `JSC__JSMap__has`, `JSC__JSPromise__isHandled`, `JSC__JSInternalPromise__{reject, resolve}`, `JSC__VM__{isJITEnabled, isTerminationException, performOpportunisticallyScheduledTasks}`. - Delete `uws_h2_res_{override_write_offset, get_write_offset, prepare_for_sendfile, get_native_handle, get_socket_data, uncork, is_corked}` and `Response::override_write_offset` in `src/uws_sys/h2.rs`. - Delete the unused `BREAKING_CHANGES_BUN_1_2` macro in `JSSQLStatement.cpp`, the unreachable `#else` branches of two `#if 1` blocks in `CryptoAlgorithmRSA_PSSOpenSSL.cpp`, and the never-exported `SlowBuffer` in `src/node-fallbacks/buffer.js`. - Verified: every symbol has zero references in `src/**`, `packages/**`, `build/debug/codegen/**`, and the prebuilt WebKit libraries. `bun bd` links, `bun run rust:check-all` passes on all 12 targets. Ran `serve.test.ts`, `serve-http2.test.ts`, `serve-http2-protocol.test.ts`, `sqlite.test.js`, `web-crypto.test.ts`, `buffer.test.js`, `bundler_browser.test.ts`. - No test: unreferenced code has no observable behavior, and `test/internal/source-lints/CLAUDE.md` asks for no dead-symbol lint tests. ### Background - `[[ZIG_EXPORT(mode)]]` marks a C++ function that `src/codegen/cppbind.ts` scrapes into `build/*/codegen/cpp.rs` as a Rust `extern "C"` declaration plus a safe wrapper. Rust calls the wrapper as `bun_jsc::cpp::Name`. A function with no Rust caller is unreachable: C++ never calls these shims directly. - `headers.h` carries hand-written `CPP_DECL` prototypes for the same extern "C" surface. Both sides were trimmed together. - The prebuilt WebKit libraries reference a few `Bun__*` symbols and define two weak defaults that Bun overrides (`Bun__thisThreadHasVM`, `Bun__analyzeTranspiledModule`). None of the deleted symbols is in either set. <details><summary>Notes</summary> How the candidates were found: - Per crate, every `pub` Rust item with zero textual references outside its crate was rewritten to `pub(crate)`, then `cargo check -p <crate>` was run with `dead_code` as a warning, on linux, windows, and darwin targets. Items flagged on all three targets and not referenced from macro bodies (`$crate::`) were the Rust candidates. After excluding files and symbols that the 13 open dead-code PRs already remove, the only survivor was `Response::override_write_offset`. The workspace already compiles with `dead_code = "deny"` and `unreachable_pub = "deny"`, so private dead code cannot exist. - `nm --defined-only` over every object in `build/debug/obj` and `libbun_runtime.a`, minus `nm --undefined-only` over all objects and the WebKit libraries (`libWTF.a`, `libJavaScriptCore.a`, `libbmalloc.a`, including their weak symbols), gave the set of C-linkage symbols nothing references at link time. A test link with `--gc-sections --print-gc-sections` (without `-rdynamic`) confirmed the same set. Codegen-emitted symbols (`*__fromJS`, `*GetCachedValue`, JSSink `*__createObject`) were excluded because they are regenerated from `.classes.ts`. - Every remaining bun C++ translation unit was also compiled with `-fsyntax-only -Wunused-function -Wunused-template -Wunused-member-function`. The 14 warnings were either in files open PRs already edit or header templates used by other translation units. - `src/js/**` and `src/node-fallbacks/**` were checked export by export. `oxlint` already enforces `no-unused-vars` there, and all 235 bundled files and every `internal/*` export have consumers. Not touched on purpose: - `Bun__thisThreadHasVM` looks unreferenced but WebKit's `RunLoopBun.cpp` declares it weak and asserts in its fallback. Removing it aborts every run. - `src/jsc/bindings/webcrypto/*.idl` (29 files) have no consumer, but the webcore `.idl` files are kept the same way as reference for the hand-written bindings. - `src/runtime/webview/ObjCRuntime.{h,cpp}`: `NSObject::describe` and `WKWebView::isLoading` have no callers, but the file compiles only on macOS. - `bindings.cpp` and `headers.h` are also edited by #40232 and #40824. The deleted functions are disjoint from both, but hunks are adjacent, so whichever merges second needs a trivial rebase. </details>
This was referenced Sep 14, 2026
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…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 22, 2026
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… 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>
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this pull request
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
#[no_mangle]Rust exports has no C++ caller, and a set of C++ helpers has no Rust or C++ caller. Each one still carries a declaration inheaders.hor a.hfile, so grep-based sweeps kept both sides alive.host-export-callers.test.tsonly checks// HOST_EXPORTmarkers. The other export forms (#[no_mangle],#[export_name],#[host_fn(export)]) have no lint, so nothing notices when their caller goes away.Fix
Zig__GlobalObject__reportUncaughtException(withVirtualMachine::report_uncaught_exception),Resolver__propForRequireMainPaths,BlobArrayBuffer_deallocator,AbortSignal__Timeout__run, a#[no_mangle] fn cinTextEncoder.rsthat duplicatesTextEncoder__encode16, and theBun__ConsoleObject__profile,profileEnd,record,recordEnd,screenshotno-op hooks.ConsoleObject.cppimplements those five as empty methods and never calls into Rust.WebCore__FetchHeaders__createValuewithFetchHeaders::from,DOMFormData__toQueryStringwithDOMFormData::toURLEncodedString,Bun__CallFrame__isFromBunMain,NapiRef::clear, andJSC__VM__hasTerminationRequestwithVM::has_termination_request.parse_args,PostgresSQLConnection::call,Bun__HashObject__crc32and the fourBun__NodeNet__*AutoSelectFamily*shims (all reached through js2native or host-function tables, never by symbol), thestrings::rsplit_oncehelper, and theBUN_DUMP_STATE_ON_CRASHfeature flag that nothing reads.host-export-callers.test.tsto every export form. A symbol must be named, outside a comment, somewhere other than its own definition. Other Rust files count, so anextern "C" {}block in another crate keeps a symbol alive. One PCRE alternation replaces one-eper symbol and keeps the scan under a second. On main the lint reports 8 orphans, all removed here.bun bdlinks,bun run rust:check-allpasses on all 12 targets, andtest/internal/source-lints,test/js/web/html/FormData.test.ts,test/js/web/fetch/fetch_headers.test.js,test/js/web/encoding/text-encoder.test.js,test/js/web/abort,test/js/bun/util/hash.test.js,test/js/node/net/connect-autoselectfamily-stale-timer.test.ts,test/js/node/util/parse_args,test/js/web/console,test/js/node/moduleandtest/js/sql/postgres-*pass.Background
#[no_mangle]or#[export_name]. rustc treats such an item as a root, sodead_codenever fires for it even when no C++ file references the symbol.extern "C"function that exists for Rust is kept by the C++ compiler, and only a Rustexternblock declaration (or a call) would show it is live.--gc-sections --print-gc-sections. The linker lists every function section nothing references. Each candidate was then checked against the source tree for a caller on any platform before it was removed.Notes
How the candidates were found:
tsc --noUnusedLocalsoversrc/jsplus an export-usage scan ofsrc/js/internalandsrc/js/builtins: nothing dead.pubflipped topub(crate)so rustc'sdead_codelint reports items no in-crate code uses. The 25,852 hits were cross-referenced againstsrc/,build/debug/codegen/andscripts/. Items with no reference anywhere were kept only when they are not platform-gated or part of an external code table (MySQL collation ids, Postgres type oids, libc constants).bun-debuglisted 13,286 discarded function sections in Bun's own objects. After dropping template and header instantiations, generatedZigGeneratedClassesaccessors, and the items already removed by the open dead-code PRs (Remove dead code from the WebCore bindings and 20 Rust crates #40525, Remove dead code from the shell builtins, windows_sys, and the handwritten C++ headers #40762, Remove dead code from bun_css, bun_react_compiler, bun_jsc, and smaller crates #40690, Remove dead code from the WebCore bindings, the JSSink codegen, and two Rust helpers #39929, Remove dead code from the JSC bindings, headers.h, the console builtin, and bun_jsc #40232, Remove dead code from bun-uws, bun-usockets, the require.extensions FFI, and unused Cargo dependencies #40294, Remove dead code from bun_core, bun_jsc, bun_css, react_compiler, and two C++ bindings #40367, Remove dead code from the inspector protocol package, bun_jsc, bun_install, and the Windows named pipe modules #40557, Remove dead code from the JSC bindings, the codegen scripts, the CI scripts, bun_core, and bun_jsc #40492, Remove dead code from the Windows bunx shim, bun_sys, libuv_sys and mimalloc_sys #40172, Remove dead code from the build scripts, the vscode and debug-adapter packages, the bake overlay, and two WebCore files #40122), the list above is what remained.AbortSignal__Timeout__run(the timer fires throughdispatch.rs, never through the export),Bun__HashObject__crc32, and the fourBun__NodeNet__*export names.Overlap with open PRs: #40232 also deletes
AbortSignal__Timeout__run. The lint added here flags it, and two identical deletions merge cleanly.Checked and left alone:
Bun__noOrphans_*,ScriptExecutionContext::getMainThreadScriptExecutionContext,Bun__Process__hasTitle,node::MaybeExt,PathLikeExt::slice_w: only called on macOS or Windows.PerformanceResourceTiming,ResourceTiming,NetworkLoadMetrics: never instantiated, but the JS constructor is part of the global surface.ncrypto::ECGroupPointer,ECPointPointer,ECDSASigPointerdefault and move constructors andrelease(): unused, butncrypto.his edited by Remove dead code from the JSC bindings, the codegen scripts, the CI scripts, bun_core, and bun_jsc #40492.dumpBtjsTraceand thecrash_handler::debugsymbol lookup behind it: a debugger entry point, reachable only from lldb or gdb.Bun__thisThreadHasVMand theWTFTimer__*exports: called by Bun's WebKit fork (Source/WTF/wtf/bun/RunLoopBun.cpp), which the lint cannot see and therefore exempts by name.[review] gate passed · iteration 1 · 27 files touched
fails on main (without fix)
passes on PR (with fix)
diff hotspot
gate history · 1 passed · 1 rejected · iteration 1
evidence per changed file