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WalkthroughSpy installation and restoration use shared property-storage logic. Failed restoration throws without clearing spy state, and ChangesSpy property lifecycle
Suggested reviewers: Priority: ⬇️ Low Merge Risk: ⚪ Minimal · up to
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| Title check | |
The title clearly summarizes the main change: shared installation and restoration logic that throws when the target refuses the write. |
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The description clearly explains the problem, implementation, behavior changes, trade-offs, scope, and verification results. It does not use the template headings exactly, but it provides the required… |
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Updated 1:21 AM PT - Oct 16th, 2026
❌ @robobun, your commit f40e1c9 has 2 failures in
🧪 To try this PR locally: bunx bun-pr 34976That installs a local version of the PR into your bun-34976 --bun |
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Status at f40e1c9. The branch is three commits on current main. The How to reproduce on a release build of main:
The regression from the first version is gone: CI at f40e1c9 (build 126438) is finished: 179 jobs passed and 2 failed. Neither failure is in code that this PR changes, and no mock test failed or needed a retry on any lane:
One question is open for a maintainer. It is in the Notes of the PR body: should a named key on a frozen object stay spy-able, or throw as in Jest? |
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No bugs found, but both changes are user-facing behavior changes (making -t case-insensitive by default, and making spyOn throw on frozen/non-extensible targets where it previously succeeded). Worth a maintainer confirming the parity trade-off is wanted.
What was reviewed:
- C++ exception-scope handling in the new
JSMock__jsSpyOnblock —getOwnPropertyDescriptor/isExtensibleboth haveRETURN_IF_EXCEPTION, and theJSModuleNamespaceObjectexemption matches the existing write path. - Checked that the extensibility check only fires when there is no own property, so spying on a configurable own property of a non-extensible object still works (covered by the third new test) and
mockRestorestill restores viaputDirect. - Grepped existing
-tusages inbun-test.test.ts— none rely on case-sensitive matching, so no existing assertions flip.
Extended reasoning...
Overview
Two independent jest-parity fixes: (1) src/runtime/cli/Arguments.rs compiles the --test-name-pattern regex with RegexFlags::IgnoreCase instead of None; (2) src/jsc/bindings/JSMockFunction.cpp adds a pre-write check in JSMock__jsSpyOn that throws TypeError when the target own property is non-configurable or the target is non-extensible with no own property, mirroring Object.defineProperty invariants. Three new tests in mock-fn.test.js and one in bun-test.test.ts. My prior nit (test placement inside the .each describe) was addressed in d8f866c.
Security risks
None. No untrusted-input parsing, no allocation sizing, no auth/crypto paths.
Level of scrutiny
Moderate-to-high. The C++ change is small and mechanically correct — every call that can enter JS (getOwnPropertyDescriptor, isExtensible) is followed by RETURN_IF_EXCEPTION, the module-namespace exemption reuses the existing tryJSDynamicCast<JSModuleNamespaceObject*>(object) pattern already present later in the same function, and the check happens before any mutation so nothing needs unwinding on the throw path. However, both changes alter default user-facing behavior: -t foo will now match Foo where it previously did not, and spyOn on a frozen object will now throw where it previously silently proceeded. Per the repo's review guidance around API/behavior changes and "never change a Bun-native default" without deliberation, this is the kind of parity trade-off a maintainer should sign off on rather than an auto-approve.
Other factors
- CI is green on the touched files across all lanes (per robobun's summary of builds 76987/77012).
- Docs (
docs/test/discovery.mdx,docs/snippets/cli/test.mdx, etc.) don't currently document case sensitivity of-t, so no doc drift, though a note might be worth adding. - The three new spyOn tests cover the matrix well (non-configurable own → throw; inherited on non-extensible → throw; configurable own on non-extensible → still works).
String(propertyKey.uid())in the error message will render a symbol's description for symbol keys, which is fine for an error message.
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Merged main into the branch. The one conflict was the The merge showed a real conflict with #37046, which landed after this PR was opened. The single Also added a test for Ran with a debug build of the merged branch: |
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LGTM — thanks for the iterations; all three earlier notes (test placement, isBun gating, and try/finally around the global spies) are now addressed.
What was reviewed:
canWriteSpyexception discipline:getOwnPropertyDescriptor/isExtensibleeach guarded withRETURN_IF_EXCEPTION, and both callers bail withreturn {}beforepushImpl/activeSpiesregistration, so a rejected spy leaves no global state behind.- Both write paths (ReplaceValue and DefineAccessor) are gated symmetrically after the module-namespace exemption; the writable-data-descriptor carve-out applies only to the value path, matching the
putDirectvsputDirectAccessorinvariants. -t→RegexFlags::IgnoreCaseis a one-line Jest-parity flip; grepped for existing-ttests relying on case-sensitive non-matching — none found.
Extended reasoning...
Overview
Two independent Jest-parity fixes. In src/jsc/bindings/JSMockFunction.cpp, a new canWriteSpy() helper guards the putDirect/putDirectAccessor/putDirectIndex calls in JSMock__jsSpyOn so that spying on a frozen object, a non-extensible receiver with an inherited method, or a WebAssembly GC struct throws a TypeError instead of silently mutating (or aborting, in the Wasm-GC case). In src/runtime/cli/Arguments.rs, the -t/--test-name-pattern regex is now compiled with RegexFlags::IgnoreCase to match Jest's i flag. Tests land in the existing files for both features (mock-fn.test.js, bun-test.test.ts).
Security risks
None. This is test-runner tooling (spyOn, test-name filtering), not auth/crypto/network. The C++ change strictly narrows behavior — it converts a user-reachable abort() and an integrity-violating write into a catchable TypeError, which is a safety improvement.
Level of scrutiny
Moderate. The C++ side touches JSC bindings, so I checked exception-scope discipline per REVIEW.md: both fallible calls in canWriteSpy are followed by RETURN_IF_EXCEPTION, the helper receives the caller's ThrowScope& by reference, and both call sites return {} on false before any global mock-registry mutation (pushImpl, activeSpies.add). The two write paths are guarded symmetrically, with SpyWrite::ReplaceValue correctly permitting the writable-non-configurable data-descriptor case while SpyWrite::DefineAccessor requires configurable — matching the actual [[DefineOwnProperty]] invariants each putDirect* variant would otherwise skip. The Rust change is a single enum-flag flip with an explanatory "why" comment.
Other factors
This PR has been through four review rounds; each of my earlier notes (test misplaced inside describe(".each"), Bun-only assertions leaking outside if (isBun), and missing try/finally around the Bun.file/Response.json global spies) was addressed by a follow-up commit, verified against the current diff. Test coverage spans the variant matrix REVIEW.md asks for: frozen/sealed/preventExtensions, own vs inherited, function vs non-function, writable-non-configurable builtins with restore verification, and the Wasm-GC abort repro. No outstanding CHANGES_REQUESTED from other reviewers.
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spyOn() and mockRestore() wrote with putDirect(), putDirectIndex() and putDirectAccessor() and read none of the results. So: - spyOn() on a WebAssembly GC struct or array aborted the process. Its Structure never transitions. - An index key on a frozen array or object returned a spy that was not installed. - A name that a module does not export also returned a spy that was not installed. - A restore that the object refused left the spy installed, forgot it, and stopped restoreAllMocks() before the other spies. Install and restore now go through one writer, putOwnPropertyStorage(). A Proxy or a WebAssembly GC object that is not extensible decides through its own defineOwnProperty(). Every other object keeps the direct store, so a spy on a frozen object with a named key, and on read-only builtins such as Bun.fetch, works as before. A refused store throws a TypeError. clearSpy() writes first and forgets the spy only when the write succeeded. restoreAllMocks() restores every spy it can, keeps the ones that were refused, and rethrows the first error. The single writer with a defineOwnProperty() arm and the restore loop follow the design in #44833. Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
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Beyond the inline findings, I also checked the new restoreAllMocks collect-and-rethrow loop against the "never clearException" rule: it uses scope.tryClearException(), which leaves termination exceptions in place and returns early, and the first exception is rethrown at the end rather than dropped. The firstException pointer held across later clearSpy calls is a stack local, and the spy snapshot lives in a MarkedArgumentBuffer, so neither is left unrooted while Proxy traps can run.
Extended reasoning...
The commit reworks the spy install/restore path in src/jsc/bindings/JSMockFunction.cpp (new putOwnPropertyStorage/installSpy/addToMockSet helpers, clearSpy now stores before clearing state, restoreAllMocks continues past a refused restore and rethrows the first error) plus tests and docs; it touches no auth, crypto, or injection surface. Five confirmed findings are posted inline and the hunt stopped at its bug cap rather than running dry, so this note only records the two exception-handling and GC-rooting concerns that were examined and ruled out.
Findings marked 🟡 are optional suggestions and need no follow-up push.
A Proxy can answer the lookup of spyOn() from its `has` and `get` traps. Then the slot has no attributes, and the value is what the trap returned. The store through defineOwnProperty() used both, so a spy on such a Proxy made a non-enumerable method enumerable, and the restore wrote the value from the trap. On that path, read the own descriptor of the target. Install and restore use its attributes, and the restore writes its value. An own accessor property gets the same error as on an ordinary object.
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Beyond the inline finding, I also checked the collect-and-rethrow in restoreAllMocks() against the repo's "never clearException" rule: scope.tryClearException() refuses termination exceptions (so the early return keeps them pending), the first JSC::Exception* is rethrown through throwException, and the MarkedArgumentBuffer snapshot roots every spy across the loop — so it is not swallowing errors.
Extended reasoning...
The diff reworks spy install/restore in src/jsc/bindings/JSMockFunction.cpp to route stores through one writer and throw on refusal, with tests in test/js/bun/test/mock-fn.test.js and mock/mock-module.test.ts and a docs note; it touches no security-sensitive surface. One confirmed finding (weak spyTarget pointing at the Proxy rather than the target on the defineOwnProperty path) is posted inline and a further verified finding is unposted, so approval is not appropriate; this note only records the restoreAllMocks exception-handling check that was examined and ruled out.
When defineOwnProperty() of a Proxy stores the spy, the spy is in the target of the Proxy. The mock held the Proxy weakly. If nothing else kept the Proxy alive, a collection cleared that reference, and mockRestore() and restoreAllMocks() then did nothing and left the spy on the target. The mock now holds such a target strongly until the restore. The same reference replaces the flag bit that said which path stored the spy.
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I reviewed the latest push (f40e1c9) and found no bugs; the spy-stuck-after-Proxy-collection problem from my previous review is now covered by spyTargetForDefine, which is visited in visitAdditionalChildrenInGCThread and exercised by the new Bun.gc(true) test. Because this rewrites the install/restore path in a JSC binding and the description explicitly leaves a behavior policy (named keys on frozen objects stay spy-able, unlike Jest) for a maintainer to decide, a human look is still worthwhile.
What was reviewed:
- Exception handling in
installSpy,putOwnPropertyStorage,clearSpyandrestoreAllMocks: every call that can enter a Proxy trap is followed byRETURN_IF_EXCEPTIONorRELEASE_AND_RETURN; the catch-and-rethrow inrestoreAllMocksusesscope.tryClearException()and bails on termination, matching the in-tree pattern. - Ordering changes in
clearSpy(restore beforereset(), state cleared only on success) and inrestoreAllMocks(set cleared up front, refused spies re-added) against the tests that assert a refused spy stays installed and registered. spyOriginalnow being set before install, and the own-descriptor re-read on the defineOwnProperty path, so a lyinghas/gettrap cannot change what restore writes back.
Extended reasoning...
The change touches src/jsc/bindings/JSMockFunction.cpp (spyOn install and restore paths, a new WriteBarrier field with its visitor entry, restoreAllMocks error aggregation), plus new tests in test/js/bun/test/mock-fn.test.js and test/js/bun/test/mock/mock-module.test.ts and one docs paragraph. It touches no security-sensitive surface (no auth, crypto, or data exposure); the risk is GC rooting and exception-check correctness in JSC bindings. The latest commit addresses the one open red finding from the prior run and the bug hunt ran dry with no new findings. Deferring rather than approving because the native refactor is non-trivial and the PR description itself asks a maintainer to decide whether frozen-object named keys should keep being spy-able or throw as Jest does.
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… and CLI (#46021) ### What does this PR do? Hardening. This collects the open pull requests that fix a crash in Bun into one change, and fixes about 20 more crashes that had no pull request. "Crash" here means a segfault, a Rust panic, an abort, a failed assertion, memory corruption that a sanitizer reports, a native stack overflow, or an exception that ends the process and that the program can't catch. With this PR those cases throw a normal error, print a normal CLI error and exit 1, or just work. 306 pull requests are included: 227 whole, and 79 cut down to the crash fix where the rest was a refactor, a feature or a behavior change. Each one was checked against current `main` first. 45 more turned out to be fixed already, and 17 were duplicates. The full list is at the bottom. #### Crashes you could hit in normal use - **`bun build` with macros and a `.env` file crashed at random.** In a repro with many macro modules, more than a third of the builds crashed. Now 3,000 of 3,000 produce the right bundle. (#45960) - **`bun run` and `bunx` aborted if a signal arrived while the child was being spawned.** (#38926, #45965) - **`bun build --compile ./index.js ./public/*` panicked** if an embedded file's name wasn't valid UTF-8. - **A truncated or corrupted compiled executable** died with SIGBUS or a panic at startup. It now prints an error. (#31787, #38251, #41360) - **Dev server:** several `Option::unwrap()` panics after a failed or deleted import (#38046, #44744, #44746), a segfault when an `onLoad` plugin throws while another bundle is queued, a request that hung and then panicked with `bundle active`, and `server.stop()` that never resolved after a client aborted a waiting request. - **`Bun.serve`:** `server.fetch(url, { headers: new Headers() })` followed by a GC segfaulted (#40888). Routes were used after free after `server.reload()` with `tls.serverName` (#38636). - **`text()` and `json()` on a stream of string chunks** could abort the process, a regression in 1.4.0. (#44269) - **`Bun.Transpiler` with `exports.eliminate` or `exports.replace`** aborted on `export default 1` and on most re-export clauses. (#44137) - **A decorated `declare` field in a class expression** with `experimentalDecorators` panicked. (#38095) - **YAML and JSON5 files with a key that isn't a string** panicked with `--no-bundle` and in `Bun.Transpiler`. (#41827) - **`Bun.FileSystemRouter`:** reading `.params` segfaulted when a rejected route candidate left its parameters behind. (#39290, #39291) - **Native addons that call `uv_async_*`, `uv_timer_*`, `uv_idle_*`, `uv_prepare_*`, `uv_check_*`, `uv_queue_work` or `uv_cwd`** aborted with "unsupported uv function" on Linux and macOS. They're implemented now. (#36609, #39652, #39892) - **`--watch` and `--hot`** panicked when the system was out of inotify instances or file descriptors, or when the reload `exec` failed. They print an error now. (#39629, #39975, #44837) - **Paths longer than the path buffer** panicked in `bun install`, the resolver, the bundler, `--compile`, `tsconfig.json` `paths` and `baseUrl`, `package.json` `main` and `sideEffects`, `bun run --filter`, `bun pm diff`, source maps and snapshots. They're ordinary errors now, or they work. (#36340, #37529, #39104, #39650, #43067) - **A Worker that creates a `ShadowRealm` and imports `node:worker_threads` in it** segfaulted. - **`structuredClone` or `postMessage` of an X25519 key** gave an object that aborted the process when read. (#45624) - **`node:stream` web adapters and `node:http2`** could end the process with an exception that no handler could catch. (#45076, #45975) - **Windows:** a watcher panic in a burst of file changes (#44344), a segfault after the machine resumes from sleep (#33015), crashes in the shell's pipe reader (#39638, #43606), and addons that import from `node.exe` without the delay-load hook (#35618). Most of the rest needs unusual input: strings near the 2 GiB limit, buffers that another thread or a getter resizes or detaches in the middle of a call, `worker.terminate()` at a bad moment, running out of memory or file descriptors, very deep nesting, or hostile arguments to `bun:ffi`, `node:vm` and `bun:sqlite`. #### Behavior changes Things that didn't crash before and behave differently now: - `new` on native functions that aren't constructors throws a `TypeError`, as in Node: `util.types.*`, `buffer.isAscii`, `isUtf8`, `transcode`, `resolveObjectURL`, `bun:jsc` exports, `cc()` symbols. It used to return the call's result. They also stop printing as `[class hostname]`. (#34575) - `` $`cmd` `` throws `ERR_INVALID_ARG_VALUE` if an environment variable's name or value contains a NUL byte. It used to cut the value at the NUL. (#44981) - `cc()` functions throw a `TypeError` for arguments that used to reach C as garbage, and `read.*(ptr, NaN)` throws. (#37989, #38057, #40773) - As PID 1, `bun` exits with 128 + the signal number on Ctrl+C or `docker stop`. (#38877) - A `NODE_MODULE` addon that's already loaded by the main thread throws `ERR_DLOPEN_FAILED` when a live Worker loads it too, as in Node. (#39968) - An exception from a `node:vm` context reaches `uncaughtException` handlers. (#39992) `vm.constants.DONT_CONTEXTIFY` returns the real global proxy. (#34623) - `createPrivateKey` rejects an EC JWK whose private value doesn't match its public point. (#33752) - `@dec static {}` is a syntax error, as in TypeScript and esbuild. (#44883) - `clearTimeout` ignores 0 and negative ids, and timer ids no longer wrap. (#44771) - HEAD for a `Response` whose body is an S3-backed `Blob` reports the length that GET sends. (#44734) - `bun:sqlite` and `node:sqlite`: if `iterate()` left a write unfinished on a connection that has a hook, a user function or an authorizer, the write is finished on the connection's next call instead of during garbage collection. If the database is gone too, it's rolled back. - `bun test --bail` runs exit listeners and closes SQLite databases. (#39010) - Dev server: a request for a client script waits while a bundle is in flight (#42733), query strings reach framework routes (#33232), and a request gets a 500 instead of hanging when plugins fail (#36812). #### File formats - `.jsc` bytecode files get a 24-byte footer so they can be verified before decoding. Files from an older Bun are ignored and the source is parsed instead. (#39396) - `node:vm` `cachedData` gets an 8-byte checksum. A blob from an older Bun is rejected, which the API allows. (#32839) - The built-in modules section of a compiled executable changes from format 1 to 2 and carries an engine stamp. (#44907) #### Performance Measured in instructions per operation on release builds of this branch and its base, with an A/A run for the noise floor (0.0 to 0.2 %). No change: `Bun.serve`, `node:http`, WebSocket echo and publish, `bun build` of 3,807 modules, `bun run` with 2,000 imports, `readdir` / `Glob` / `fs.cp` over 23,689 entries, startup and RSS. The binary grows by 176 KB (0.17 %). | Faster | Instructions | | --- | --- | | WebSocket echo of a 1 MB non-ASCII text message | −72 % | | `Bun.inspect` of a large non-ASCII string | −39 % | | `Bun.markdown.html` on large non-ASCII input | −33 % | | `` $`cmd` `` with 300 environment variables | −6 % | | `fs.readSync` | −5 % | | `TextEncoder.encodeInto`, short ASCII strings | −4 % | | async `crypto.pbkdf2`, 16-byte inputs | −17 % | | Slower | Instructions | Why | | --- | --- | --- | | `cc()` calls | +5 to +51 per call | Argument count and type checks, and a check for `close()` (#37989, #38057, #43802, #44921). `dlopen()` calls don't change | | `process.env.X = v` | 38 → 593 per write | Writes aren't cached. Reads don't change (#38871) | | async `crypto.pbkdf2`, inputs of 1 KB or more | +4 to +9 % | Password and salt are copied (#40554) | | `bun build` with an object `--define` used thousands of times | +4.5 % | The object is copied per use (#45969) | #### Not included - Fixes that need a WebKit change: #39967, #42534, #42982, #43764, #43786, #44226. #42185 too: a typed array that has no `ArrayBuffer` yet can't be pinned, so `view.buffer.transfer()` during an async call can still free its bytes. Creating the `ArrayBuffer` up front costs 7 to 12 % on every async `fs` call, so the fix belongs in JSC: an `ArrayBuffer` created while the view is borrowed should start out pinned. - #45442 (`calc()` sums as a flat list): it changes minified output for real stylesheets to survive a `calc()` with 25,000 terms. It deserves its own review. - #40023 (Windows event loop redesign), #29928 (Windows exit path), #40534, #43963, #39571, #42904, #42834, #36355, #43266: refactors or features whose crash is already covered or isn't a crash. - The pull requests marked *(crash fix only)* below should stay open for their other half. ### How did you verify your code works? - **Tests.** Every fix has a test that fails on `main` (a release or an ASAN build) and passes on this branch, except where that isn't practical: code that only runs on Windows or macOS, inputs that need several GB of memory, and a few rare races. Those were checked by hand or by reading. - **Stored repro scripts.** 230 crash repros ran on release and ASAN builds of this branch and of `main`, side by side. Release: 88 no longer crash. ASAN: 106 no longer crash. None crashes that didn't before. What still crashes needs WebKit, is SQLite's own bug, or isn't a crash. The ASAN number is from a later commit than the release number. - **Dev server.** Because one fix makes requests wait, 2,171 generated programs ran random interleavings of edits, build errors, failing plugins, reloads, stops and disconnects with about 120,000 requests. No request hung, was answered twice or got a stale body. `main` hung in 82 of 1,161 programs. This also found the four dev server bugs listed above. - **Path helpers.** 336,000 boundary cases with buffers of exactly the computed size, and 12,003 random calls through 30 JS APIs on an ASAN build, compared with `main`. No sanitizer report, and the results match wherever `main` doesn't panic. - **What worked on 1.4.3 still works.** Reviewers compared behavior with 1.4.3 and took out what changed it: for example an output directory layout change for 9 or more entry points, a `server.reload()` change, and a changed error message for `import("file:///50%deposit.ts")`. - **Not run locally:** the Windows, macOS and FreeBSD code paths. CI compiles and tests them. ### Included pull requests **Bundler, transpiler, CSS, macros** (33) - #33881 bundler: allocate wrapper_ref for CommonJS modules with no non-hoistable statements - #35055 Bun.build plugins: handle filter RegExp flags beyond i/m/v - #37769 bundler: fail the build instead of panicking when the bundle thread cannot create its waker - #37784 bundler: copy inlined env values into the define arena, and give each Bun.build its own env copy *(crash fix only)* - #37858 bundler: fail the build instead of panicking when a plugin answer string cannot be converted - #38046 bun build --server-components: require the bun target and reject directives without a framework *(crash fix only)* - #38095 js_parser: fix panic on decorated declare/abstract fields in class expressions with experimentalDecorators - #38966 bundler: keep deep CSS, export star and composes graphs from overflowing the linker's stack - #38984 bundler: stop an export star ambiguity that loops back into a re-export chain from overflowing the stack - #39113 css: reject stylesheets of 2 GiB or more instead of aborting on an int cast - #39396 bundler: frame .jsc bytecode sidecars and verify them before decoding - #39855 bundler: join the work still on the pools before the bundle is torn down *(crash fix only)* - #41157 dev server: leave out an html link to a cached json module instead of panicking, and mark a new placeholder file stale - #41801 css: decode ill-formed UTF-8 to U+FFFD before tokenizing *(crash fix only)* - #41827 bundler: handle YAML and JSON5 keys that are not strings instead of panicking - #42242 js_parser: compress symbol link chains when following merged declarations - #42387 bundler: check receivers on the Bun.build plugin object and freeze its filters during a build - #42413 Bounds-check the InternalSourceMap window reader - #42657 macros: keep visited values alive so a reused address does not get another value's Expr - #43330 transpiler: do not print an empty `var` for a data file with no named export - #43355 bundler: fix "The memory limit has been exceeded." on large HTML entries - #43658 react-compiler: fix skipped functions and build aborts for dead code in a try body *(crash fix only)* - #44137 js_parser: fix four crashes of exports.eliminate and exports.replace - #44467 js_parser: replace skipped expressions with E::Missing and skip argument checks after a stack overflow - #44662 js_parser: walk binary chains on the heap and check the stack when rewriting decorated #private accesses - #44712 json5: reject sources of 2 GiB or more before parsing instead of aborting on an int cast - #44864 js_parser: walk conditional chains in import()/require() and define keys in a loop - #44883 js_parser: reject a decorator on a class static block, keep decorators out of the body of `declare global` *(crash fix only)* - #45045 Fix a segfault in new Bun.Transpiler(): re-point options.log after the constructor moves its Log - #45604 css: keep a url() in an at-rule prelude as written, and never print the resolved path of a url() *(crash fix only)* - #45748 bundler: put --banner/--footer in the bytecode ESM module record (flags from a parse, entries from JSC) *(crash fix only)* - #45960 macros: give each parse-worker macro VM its own env loader - #45969 js_parser: copy object and array defines per use, and copy the list of a lone JSX spread object *(crash fix only)* **`bun build --compile` and standalone executables** (3) - #31787 Don't crash at startup when a standalone executable's embedded graph is corrupted *(crash fix only)* - #38251 compile: exit with an error instead of SIGBUS when a standalone executable is truncated - #41360 standalone: check every offset in the embedded module graph before reading it **Resolver, module loading, plugins, paths** (25) - #32269 Bun.plugin: validate the namespace without a shared regex - #33183 bun:jsc: filter internal cells out of getProtectedObjects() - #34575 Don't register native functions as their own constructors - #36340 paths: size the thread-local join output buffers to MAX_PATH_BYTES on Windows - #37037 mock.module: reject async factory results that are not objects - #37065 bun:jsc: propagate JSONParse exceptions from samplingProfilerStackTraces - #37529 resolver: don't abort on a package.json sideEffects entry longer than the join buffer - #38179 node:module: throw instead of crashing when module._compile is set to a non-function - #38273 bun test: report a test file or preload the loader cannot resolve instead of exiting; keep the JUnit report valid U… *(crash fix only)* - #38732 paths: compute the common path of 9+ inputs with the same loop as fewer *(crash fix only)* - #39228 paths: strip C:\\ down to the drive root in without_trailing_slash_windows_path *(crash fix only)* - #39650 bun run --filter: stop panicking on workspace paths longer than the path buffer - #40186 resolver: stop deeply nested exports targets from overflowing the stack - #40258 resolver: publish Entry.abs_path through the per-entry mutex - #42183 node:module: reject a _resolveFilename override result that contains a null byte - #42401 node:module: accept any `this` in Module.prototype.require *(crash fix only)* - #42405 Bun.plugin: transpile a copy of typed array onLoad contents - #42414 node:module: end the Module._stat path at the first null byte - #42685 resolver: strip the trailing separator inside bust_dir_cache - #42735 Throw a RangeError instead of aborting when require.resolve paths or Worker preload outgrows its Vector - #43067 Report a path that does not fit a path buffer instead of aborting *(crash fix only)* - #44410 Fix a crash when code from a node:vm context reads require.cache or require.extensions - #44466 Trace the value an object or data module exports from its JSSourceCode - #45044 Bun.plugin: give onLoad's args.path its own bytes - #45117 cjs: do not call an `__esModule` getter during the annotation lookup **Dev server, `bun bake`, routers, `--watch` and `--hot`** (28) - #28793 Stop file watcher thread before Global.exit tears down memory *(crash fix only)* - #32143 bake: fix "Runtime file not found" panic in production builds of custom frameworks - #32443 watcher: don't free the Watcher in the spawn-to-start window *(crash fix only)* - #33232 bake: normalize the HTTP request-target before matching framework routes - #36812 bake: respond 500 and release both RequestContext refs when on_plugins_rejected / OOM drains a deferred framework r… - #37039 bake: report per-file print failures in the dev server instead of serving empty modules - #37276 hot_reloader: take entries_mutex for watcher-thread directory cache probes - #37444 bake: unregister Bake::SourceProvider from the source map table when it is destroyed - #39290 FileSystemRouter: match / against a root-level optional catch-all route *(crash fix only)* - #39291 FileSystemRouter: order dynamic routes by per-segment precedence like Next.js *(crash fix only)* - #39629 watch: report a failed watcher init as an error instead of a crash - #41185 bake: check for exceptions in the production build's module loader hooks and helpers - #41340 bake: skip the directory watch when the directory cannot be opened - #41617 Decide a directory watch event from the watchlist, not from the resolver's cached listing *(crash fix only)* - #42547 bake: re-arm the memory visualizer timer when it fires - #42733 dev server: make a client script request wait for the bundle in flight - #42828 bake: serve routes from a router root outside the project root instead of aborting or answering 404 - #42831 bake: resolve app.root and router roots through one checked join - #42836 bake: report route scan errors instead of aborting, and fail bun build --app on them *(crash fix only)* - #42840 dev server: map a router type's server entry point to the root route of that type - #42862 Bun.serve: return before a pending app.plugins setup() settles *(crash fix only)* - #42920 Do not create a mimalloc heap per FileSystemRouter, reload() or :nth-child(An-B) selector - #42934 dev server: register a client component without evaluating it - #43329 dev server: check the route bundle index of a client script URL before Index::init - #44249 fs.watch: read each directory and close it before descending - #44344 Windows: fix a watcher panic and lost events in a burst of file changes, and a --hot that stops watching a deleted… - #44744 dev server: answer a cached-file lookup only for a graph that bundled the file - #44746 dev server: keep an importer in its own graph when an import fails or is deleted **`Bun.serve`, sockets, HTTP, WebSocket, HTTP/2, QUIC, DNS** (28) - #42667 Reland "usockets(windows): keep a closed poll alive until the outer tick and libuv are done with it" (#39643) - #33015 fix(windows): segfault in uv__wake_all_loops after system resume *(crash fix only)* - #35761 node:quic: detach lsquic ctx pointers before the finalize-order sweep at worker VM teardown - #37082 Bun.serve: terminate FIFO/pipe file responses at EOF - #38024 dns: keep the c-ares uv_poll_t alive while its poll callback is on the stack (Windows) - #38636 serve: fix route use-after-free after reload() with tls.serverName *(crash fix only)* - #40888 server.fetch: copy a Headers argument instead of adopting the wrapper's pointer - #41337 Update lsquic to 4.9.4 and free unsent stateless resets on destroy *(crash fix only)* - #41384 usockets: hold a tick level for the whole of close_all - #41412 Windows: wait for close completions when closing a worker's uv loop - #41516 node:http2: handle an empty byte range in respondWithFile and respondWithFD - #41521 udp: report every binaryType from the getter, reject a dgram bind of the other family *(crash fix only)* - #42188 net: do not assert a two-character host in SocketAddress.parse - #42210 libuv(windows): keep a pipe's completed read counted until its read callback returns - #42334 fetch, Bun.serve: throw a RangeError for Headers that total 4 GiB or more *(crash fix only)* - #43738 usockets: close a socket whose resume the kernel refuses from the loop, not from the caller - #44338 node:http: response trailers travel with the end call of the response *(crash fix only)* - #44433 bake: make the parked-request list non-owning and look up the DevServer when a plugin load settles - #44533 node:quic: capture the handshake while the conn is alive, set the application at session creation - #44734 Bun.serve: answer HEAD for an S3-backed Blob body without an S3 stat - #44751 node:quic: close() waits only for opened streams, and lsquic sends no GOAWAY before HTTP/3 starts *(crash fix only)* - #44897 node:http2: throw instead of panic when the native setNextStreamID() misses its argument - #45076 node:http2: let close() and destroy() win over the refusal of a request - #45341 uws: AsyncSocket::write takes a size_t length, so res.end() sends a body of 2 GiB or more whole - #45522 node:http2: throw for an ALTSVC frame that is too long and for a pushPromise id that is not a stream id - #45676 node:quic: do not reset a stream lsquic has already finished - #45822 node:quic: name a stream in queued session events by a per-session key, not by its address - #45858 Bun.serve WebSocket: a message that does not fit in memory fails one connection, not the server *(crash fix only)* **Streams, Blob, S3, files, `node:fs`** (28) - #33845 io: propagate IoRequestLoop init failure instead of aborting *(crash fix only)* - #36365 prompt: drop debug_assert that rejects answers containing CR - #37090 Deliver FIFO bodies whose writer connects after the reader opens *(crash fix only)* - #38039 node:fs: stop fs.copyFile(src, "") from segfaulting on Windows - #38653 shell(cp): reject copying a directory into itself; walk cp trees without recursion - #39207 Convert scope-object receivers in the chaining functions and inspect.custom fallbacks - #39390 Blob deserialize: reject over-long paths, treat size >= MAX_SIZE as unknown, make slice() non-panicking - #39639 fetch: drop the upload and drain hop refs at VM teardown *(crash fix only)* - #40008 inspect hooks: copy user options with putDirectMayBeIndex *(crash fix only)* - #40462 Windows: FileSink.start({ path }) on a live writer: hand the writer a libuv fd and close the old source *(crash fix only)* - #41440 node:fs: pass the buffer to the read/readv/write/writev callback on error - #41584 Walk the timer pairing heap without recursion - #41608 native-readable: accept a stream with no native handle - #41710 JSSink write(): convert the chunk before resolving the native sink *(crash fix only)* - #42711 webstreams: bound the native recursion through a chain of tees or text streams - #43264 fetch: reject a file: URL whose path has an encoded NUL - #43709 s3: fix double free of a multipart part's bytes on worker terminate - #43950 streams: link readers and writers last, reject their promises as handled - #44036 PipeReader: label a chunk Eof only when the reader is at its end - #44181 streams: throw instead of aborting when a direct stream's text sink cannot take a string chunk - #44195 fs: validate POSIX directory records in one parser, report a malformed record as EIO *(crash fix only)* - #44269 streams: join the string chunks of a text consumer with one allocation - #44490 watch(windows): report a failed child spawn as an error instead of a panic *(crash fix only)* - #44954 process.stdout/stderr with no FileSink: write synchronously, reset after a failed write *(crash fix only)* - #45004 streams: leave a stream alone when a consumer fails to lock it - #45521 FileSink: throw ERR_ILLEGAL_CONSTRUCTOR from the constructor that script reaches by writer.constructor - #45738 s3: own the Blob store across the calls that run user JS - #45975 node:stream: do not touch the web controller after the web side is done **Node-API, V8 API, `bun:ffi`, `process.dlopen`** (15) - #36609 napi: implement uv_cwd on POSIX - #37989 bun:ffi: stop cc() from turning non-numeric pointer arguments into garbage pointers - #38057 bun:ffi: make cc() reject non-numeric i64/u64 arguments instead of passing garbage - #38425 bun:ffi: throw on an empty cc() source array instead of panicking - #39652 napi: implement uv_async_t, uv_queue_work and uv_default_loop on posix - #39805 Share one handle scope implementation between Node-API and the V8 API - #39892 napi: implement uv_idle_t, uv_prepare_t, uv_check_t and uv_timer_t on posix - #40144 bun:ffi: return undefined for a NULL napi_value from cc() and throw the scheduled napi exception - #40773 bun:ffi: add the full byteOffset in read.*, do not truncate it to int32 - #41704 napi: hand the thrown value to napi_get_and_clear_last_exception after napi_run_script - #42960 process.dlopen: run a V8 addon's init function after dlopen() returns - #43797 Fix debug assertion on an empty error message from a V8 addon or SQLite *(crash fix only)* - #43802 bun:ffi: throw a TypeError when a cc() symbol is called after its library's close() - #43940 napi: fail with ERR_BUFFER_TOO_LARGE instead of aborting above the ArrayBuffer limit *(crash fix only)* - #44921 bun:ffi: pad a short call to a cc() symbol with undefined **`node:vm`, workers, process, timers** (19) - #34623 node:vm: run DONT_CONTEXTIFY contexts directly against the real global - #32839 node:vm: reject invalid cachedData instead of crashing - #36921 error printer: clear the pending exception when formatting a non-Error uncaught value throws - #37270 error printer: one render per error, [Circular] under the key that closes the cycle - #38740 bun:test: give each VM its own fake clock *(crash fix only)* - #39864 Report a refused HTTP, bundle, IO or process waiter thread as an error instead of a crash *(crash fix only)* - #39992 process: deliver exceptions reported against a node:vm context to uncaughtException - #41654 node:vm: give each SourceTextModule request the import attributes of the declaration that created it *(crash fix only)* - #41739 Do not forward the inherited IPC channel to spawned scripts and tools - #41769 node:vm: stop compiling accepted cachedData, report each cachedData decode to the GC *(crash fix only)* - #42045 bun:test fake timers: never move the fake clock backwards - #42308 process.execve: throw instead of aborting for a string past the string limits - #42734 node:vm: report cachedData of 2 GiB or more as rejected instead of aborting - #42843 process.dlopen: reject a filename of PATH_MAX or more before dlopen() - #43500 process: accept SIGSTKFLT, SIGPOLL and SIGPWR, and emit every name of a signal number *(crash fix only)* - #44486 worker: stop the start sequence when a handler it calls stops the worker - #44771 timers: allocate ids from one 64-bit counter that never wraps - #44837 --hot: defer a reload during the preloads, and report a reload that cannot start - #44991 Fix a use-after-free in the VM ref-string intern for a string over the length limit **Shell, spawn, CLI, `bun test`, `bun install`** (31) - #30642 Fail fast at startup when simdutf has no usable implementation for this CPU - #34223 Fix four crashes: HTMLRewriter disturbed body, S3 locked-stream upload, ConnectionsList closed parser, shell brace… *(crash fix only)* - #34884 Guard the console and test-runner formatters against native stack overflow on deeply nested values *(crash fix only)* - #36584 process.chdir: publish an immutable cwd slice so no thread sees a torn cwd - #37135 bun test --parallel: hold the JSC API lock while draining the worker's final IPC backlog - #37527 shell(mv): report ENAMETOOLONG instead of panicking when a source name does not fit the path buffers - #37528 cli: stop aborting on absolute script paths longer than 1024 bytes on Windows - #38162 shell(cp): report ENAMETOOLONG instead of panicking on operands longer than the path buffers - #38205 shell(windows): report ENAMETOOLONG for operands that do not fit the path buffer - #39010 bun test: exit through the VM teardown path when --bail stops a run - #39104 bun test: report over-long coverage dir, JUnit outfile and bunfig root instead of panicking *(crash fix only)* - #39638 shell(cat): serve a second cat on the same stdin instead of hanging or panicking - #39641 usockets: report an out-of-descriptors event loop init as an error, not a crash *(crash fix only)* - #40181 shell: stop deeply nested if clauses from overflowing the parser stack - #40885 shell: throw instead of panicking when a ReadableStream is used as a redirect - #41155 ipc: send a queue item larger than 2 GiB in capped write requests - #42298 bun:test: print String objects with 16-bit storage correctly - #42577 bun:test: root the return values toHaveReturnedWith collects - #43606 shell(windows): report a failed pipe reader start through on_reader_error instead of leaking the subprocess *(crash fix only)* - #43838 node:cluster: read a worker's `ack` and `addressType` in the primary only when they are int32 - #44172 node:cluster: refuse a descriptor of the wrong kind in the primary *(crash fix only)* - #44185 node:cluster: one handle for each descriptor that workers name *(crash fix only)* - #44491 bun test: run every callback when native code leaves an exception pending *(crash fix only)* - #44694 shell mv: refuse to copy a directory into itself on the cross-device fallback - #44752 shell: take the command-substitution capture and drop its NUL bytes - #44981 shell: reject NUL bytes in .cwd() and .env() at the native setters - #45206 ini: reject a source of 2 GiB or more in Parser::parse instead of aborting on an int cast *(crash fix only)* - #45348 bun test: fix a segfault in .not.toThrow(Class) when Symbol.hasInstance accepts a thrown string, symbol or BigInt - #45649 shell: replace the output counters in mkdir, cp, ls and touch with the OutputTask queue - #45792 bun test: SIGKILL a spawnSync child that is still running 500 ms after the test's timeout *(crash fix only)* - #45910 create: own the remote-template response buffers instead of parking them in the CLI arena **Web APIs, Buffer, encoding, URL, crypto, zlib, SQLite, Redis and the rest** (96) - #29709 console: guard JSX/Proxy recursion in Bun.inspect (stack overflow SIGSEGV) - #30817 console.takeHeapSnapshot: clear prior snapshots before building - #30956 spawnSync: make signal-forwarding register/unregister safe for concurrent callers *(crash fix only)* - #31505 node:zlib: reject invalid brotli flush values at validation *(crash fix only)* - #31735 node:path: fix win32 drive-relative resolve on non-Windows hosts *(crash fix only)* - #32085 Fix crash when RedisClient onclose/onconnect is set to a non-callable - #32240 Fix BroadcastChannel custom inspect crash with numeric option keys - #33181 Reject interior null bytes in Bun.mmap, Glob.scan, and FileSystemRouter paths *(crash fix only)* - #33752 node:crypto: validate EC JWK private scalar matches public point in createPrivateKey - #34976 spyOn: install and restore through one writer that throws when the object refuses *(crash fix only)* - #35562 structuredClone: purify NaN in deserialized Date timestamp so getTime never returns a forged JSValue - #35618 napi(windows): load addons that import node.exe without win_delay_load_hook - #35757 Coerce later arguments before capturing input buffers in Bun.Transpiler and Bun.RedisClient - #37252 Report UTF-16 to UTF-8 encode counts through size_t so exactly 2^32 written bytes doesn't wrap to 0 - #37338 node:module: build require.cache without user-writable globals and propagate its exceptions *(crash fix only)* - #37340 redis: accept unsubscribe acks that arrive outside subscriber mode - #37370 Error.appendStackTrace: make appending an error's trace to itself a no-op - #37443 node:crypto: fix null deref when worker.terminate() lands during an EC JWK private key import - #37448 jsc: check for exceptions before using a stored constructEmptyArray result *(crash fix only)* - #38009 MessagePort: fix a heap-use-after-free in contextDestroyed(), release ref() when the last 'message' listener is rem… *(crash fix only)* - #38469 napi: settle or refuse async work queued during VM teardown instead of taking a ticket - #38708 Handle 16-bit module sources in the error preview, the new-position fix-up and the REPL *(crash fix only)* - #38821 process.env: make a failed env build throw instead of aborting (Windows 0xC0000409 on Bun.$ / Bun.sql / process.env… - #38871 process.env: coerce to string on every execution of an assignment, not just the first - #38877 cli: exit 128 + signo when bun cannot die from a re-raised signal (bun as container PID 1) - #38926 Clear the inherited signal mask at startup and exec children with an empty one *(crash fix only)* - #39382 Make a failed util.inspect load throw from custom inspect functions instead of aborting - #39481 Always create the error when a native error message exceeds the string length limit - #39651 performance: keep the user timing entry counts exact after clearMarks(name) and clearMeasures(name) - #39775 Turn seccomp SIGSYS traps into ENOSYS so the syscall fallbacks run on Android - #39968 process.dlopen: replay a non-context-aware V8 addon only while no other live VM owns it - #39975 watch: report a failed reload exec as an error instead of a panic *(crash fix only)* - #40346 Give Glob's native scan methods their own private names - #40554 node:crypto: copy password and salt for async pbkdf2 and scrypt - #40567 url: reject URL-encoded input over the WTF decode limit instead of aborting - #40577 url: throw a RangeError instead of aborting when URLSearchParams or FormData outgrows its Vector - #41073 Store array-index property names as indexed properties in native object builders - #41137 Write the sampling profiler report at exit from Bun, not JSC's atexit hook - #41365 webview: fail only the view when WebKit lacks initWithDirectory: - #41574 Decode a private copy of a JS buffer in the UTF-8 decoders *(crash fix only)* - #41652 console: read a BigInt depth option by value in console.dir - #41749 Startup: reopen fd 0-2 as /dev/null only when the fd is closed - #41819 Report an incoherent BUN_JSC_* option combination as a configuration error, not a crash *(crash fix only)* - #42158 webview: reject malformed Chrome replies instead of crashing - #42179 shell: clamp a `> ${buf}` redirect to the target buffer's live length - #42187 node:crypto: throw ERR_OUT_OF_RANGE for >2 GiB buffer arguments instead of aborting - #42191 URLPattern: throw instead of aborting when a pattern string passes the string limit - #42192 Copy WebAssembly.Memory bytes for native borrows that outlive the call *(crash fix only)* - #42198 Make Bun.$, Bun.sql, Bun.postgres and Bun.SQL custom value getters so reifying the Bun object passes exception chec… - #42203 node:fs: fs.read into a WebAssembly.Memory view writes into the block a grow freed - #42214 Headers: throw a RangeError instead of aborting when the set-cookie list cannot grow - #42218 Headers: throw instead of aborting when a value passes the string length limit - #42220 URLPattern: throw instead of aborting when the token list cannot grow - #42225 Throw ERR_STRING_TOO_LONG from Bun.wrapAnsi instead of aborting when the output passes the string length limit - #42226 Throw instead of aborting when a MIME string does not fit in a string *(crash fix only)* - #42237 Bun.Cookie: throw instead of aborting when the Set-Cookie string passes the string length limit - #42249 Copy a shared input before libdeflate compresses it in Bun.gzipSync and Bun.deflateSync - #42253 bun test: walk nested describe scopes without native recursion - #42259 Throw instead of aborting when a domainToASCII host passes the string length limit - #42310 Parse a private copy of a shared or resizable buffer in Bun.Transpiler, Bun.markdown, Bun.YAML and Bun.TOML *(crash fix only)* - #42312 YAML, JSON5, XML stringify: throw instead of aborting when the output passes the string length limit - #42318 Bound libdeflate's emit path so a racing input cannot overrun the output - #42338 inspector: check the type of process.argv in getModuleGraph - #42364 node:perf_hooks: do not truncate the monitorEventLoopDelay resolution to int32 - #42412 transpiler cache: reject an entry with no sourcemap section - #42479 worker_threads: do not abort when markAsUntransferable/markAsUncloneable gets a WebAssembly GC reference - #42517 EventTarget: skip a listener object that has no realm - #42518 fs.Stats: make the date accessors define the property like Object.defineProperty *(crash fix only)* - #42575 Stop natives from writing onto a foreign `this` with putDirect: process.ppid, require.cache, StringDecoder, the nat… *(crash fix only)* - #42631 JSStringView: pin the cell that owns the borrowed characters - #42660 bun_core: read /dev/urandom when getrandom(2) answers ENOSYS or EPERM - #42780 node:crypto: treat a name too long to convert to UTF-8 as unknown instead of aborting - #42782 node:crypto: throw ERR_OUT_OF_RANGE for a passphrase larger than INT_MAX bytes - #42856 url: do not abort when a host is too long for the IDNA conversion buffers - #42868 sqlite, console, process: do not abort on a string too long to convert to UTF-8 *(crash fix only)* - #42941 Bun.sliceAnsi: throw instead of aborting when the result passes the string length limit - #43058 Bun.serve: fix crash and cross-request 500 when inspecting a non-Response return value throws - #43904 JSC bindings: build property keys from a BunString through Bun::toIdentifier - #44124 Bun.Image: decode WebP into a Bun-owned canvas and read ICCP without the demuxer *(crash fix only)* - #44190 Convert scope-object receivers before Buffer read*/write* and vm.Script describe them - #44211 Stop getsockname(out), useFakeTimers() and the stream source pull() from writing onto a caller's object with putDirect - #44295 bun test --coverage: append a final newline to a text that lacks one *(crash fix only)* - #44360 rust-argon2: return OutOfMemory instead of aborting when the memory cost cannot be allocated - #44421 node:zlib: free zstd's workers before the dictionary they read - #44521 util.parseArgs: pick the default args start from a per-VM eval flag, as Node v26 does *(crash fix only)* - #44740 structured clone: tolerate a zero-sized shared WebAssembly.Memory in computeMemoryCost() - #44759 HTMLRewriter: park a suspended handler's token before the output flush - #44907 Builtins section format 2: an engine stamp says which buns compile its modules - #45188 Reject an oversized WebCrypto cipher output instead of aborting - #45354 Throw for a `file:` URL whose path is not UTF-8 on Linux and macOS, through one `fileSystemPath()` accessor *(crash fix only)* - #45608 ipc: refuse an over-long message before the receive buffer stores it - #45624 webcrypto: write the key type into the X25519 structured-clone record - #45625 node:sqlite: refuse session.close() and Symbol.dispose inside a SQLite callback - #45653 glob: a group with `?` or a class matches when an alternative takes 64 bytes or more - #45820 Bun.file, S3Client.file and Bun.write no longer keep a buffer path alive forever - #45832 `bun check`: fix a panic on `export *` without a module specifier, and a false error for one in parentheses ### Already fixed on `main`, or duplicates of a pull request above Already fixed: #27323 #30401 #31011 #31206 #31566 #31626 #31695 #31702 #31945 #32773 #34154 #34697 #34744 #34964 #35655 #35816 #36020 #36181 #36296 #36342 #36581 #36602 #36807 #36818 #36857 #37172 #37235 #37239 #37267 #37420 #37731 #37914 #38113 #38119 #38509 #38514 #38540 #38975 #39410 #40749 #41163 #41171 #42108 #43085 #43230 Duplicates: #45654 #29986 #33378 #36895 #37070 #37639 #38014 #39021 #41266 #42250 #42951 #43238 #44259 #45335 #45565 #45726 #45965 Fixes #5019 Fixes #6106 Fixes #10690 Fixes #10886 Fixes #13566 Fixes #14745 Fixes #15551 Fixes #20454 Fixes #21310 Fixes #29145 Fixes #30454 Fixes #30613 Fixes #30766 Fixes #32103 Fixes #32142 Fixes #32183 Fixes #32212 Fixes #39060 Fixes #42296 Fixes #42931 Fixes #43671 Fixes #44201 Fixes #44735 Fixes #44783 Fixes #45198 Fixes #45327 Fixes #45491 Fixes #45721 --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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Problem
spyOn(wasmGcStruct, "x")aborts the process:panic(main thread): abort() called.JSMock__jsSpyOnandclearSpy(src/jsc/bindings/JSMockFunction.cpp) store withputDirect()and read no result.Fix
putOwnPropertyStorage(). A refused store throws aTypeError.Proxyor a WebAssembly GC object that is not extensible decides through its owndefineOwnProperty(). Every other object keeps the direct store.clearSpy()forgets the spy only after the write.restoreAllMocks()restores every spy it can and rethrows the first error.test/js/bun/test/mock-fn.test.jsandmock/mock-module.test.ts. Main fails 8 and passes the 2 guards.Background
defineOwnProperty()is the object's own hook behindObject.defineProperty.defineOwnProperty()for every target. Both rejectspyOn(Bun, "fetch")and 35 moreBunkeys. The writer follows bun test: Vitest compatibility #44833.Downsides
TypeErrors where a useless spy was returned: an index key on a frozen object, a missing module export, aProxyover a frozen target. An object that always refuses the restore makes each laterrestoreAllMocks()throw.spyOn+mockRestorepair: +131 instructions (1,929 to 2,060), 0 indirect calls, 0 GC cells. Release binary: +1,408 bytes.Notes
A debug build prints
ASSERTION FAILED: WebAssemblyGCStructure should not do transitionfor the abort.Question for a maintainer. The audit line behind this PR said that
spyOnon a frozen object installs an inert spy and that Jest throws. Measured on 1.4.3-canary.1, a spy on a named key of a frozen object is not inert: it records calls,mockReturnValuetakes effect, andmockRestoreputs the original back. Only index keys are inert, and those now throw. #44833 tests frozen and non-extensible targets as spy-able ("consistent with method spies"). So this PR keeps them spy-able. The other choice is one predicate instoresThroughDefineOwnProperty(): send every target that is not extensible throughdefineOwnProperty(). Then these working spies throw, as in Jest: a frozen own method (bson's frozenEJSONandBSON, 2 of 2 tests pass on main and on this PR), WebAssemblyinstance.exports, and a restore afterObject.freeze.What changes against main.
spyOn(wasmGcStruct or wasmGcArray, key), named, symbol or index keyTypeError: Cannot define property for WebAssembly GC objectspyOn(Object.freeze([fn]), 0), also a frozen object with key0TypeError: Cannot spy on the 0 property because the object does not allow it to be changedspyOn(moduleNamespace, "notExported")TypeError: Cannot spy on the notExported property because the module does not export itspyOn(new Proxy(Object.freeze({ fn }), {}), "fn")TypeErrorfrom the targetspyOn(new Proxy(Object.seal({ fn }), {}), "fn")Proxyalive until the restore0, thenObject.freeze(array), thenmockRestore()TypeError: Cannot restore the 0 property ..., spy stays and stays registeredspyOn(Object.freeze({ fn }), "fn"), also sealed andpreventExtensionsspyOn(Bun, "fetch"),Bun.env,Bun.version,Bun.argv,Bun.stdout,Math.PIThe messages have backticks around the property name.
Measurements. Release builds of main (af5743d) and of this PR (f40e1c9), same machine, same toolchain.
mock-fn.test.js, and 25 pass and 1 fail inmock/mock-module.test.ts. This PR has 130 pass, 1 todo, 0 fail in both files.spyOn+mockRestoreon an extensible object: +131 instructions, +0 indirect calls per pair. Baseline 1,929 (spyOn1,629,mockRestore300). This PR 2,060 (1,745 and 315). Direct calls 27 to 31. Method: gdb single-step from entry to return ofJSMock__jsSpyOnandjsMockFunctionMockRestore, pairs 41 to 45, 3 runs.perfandvalgrindare not installed here.llvm-nm -Son bothbun-profilebinaries). Smaller:JSMock__jsSpyOn10,094 to 8,456,JSMock__jsMockFn1,504 to 874,clearSpy996 to 614. Larger:JSMock__jsRestoreAllMocks394 to 448, and the two GC visitors of the mock, 1,984 to 2,173. New:installSpy1,006,putOwnPropertyStorage569,addToMockSet690,throwStoreRefused1,385, and a copy ofPropertyDescriptor::setDescriptor127..text, +1,408 bytes total (llvm-size -A).heapStatsdeltas for Mock, GetterSetter, Function, Object and Structure do not grow from 20,000 to 800,000 pairs on either build).sizeof(JSMockFunction)goes from 152 to 160 bytes. Its GC cell is 160 bytes on both builds, because anIsoSubspacerounds the size up to 16 bytes. The GC reads one more field for each mock that it visits.Proxytraps perspyOnon an extensibleProxy: has 1, get 1 on main. This PR addsisExtensible1 at install and 0 at restore. AProxythat is not extensible also getsgetOwnPropertyDescriptor1 anddefineProperty1.Bun.*keys that install and restore with the same descriptor: 117 of 118 on main and on this PR. The first version of this PR had 81. The one key isBun.main, an accessor.Bun.*,process.*,console.log,Math.PI,globalThis.NaN, and more).zlib.codes[0],[1],[2]). The sweep doesspyOn+mockRestoreon each own data property of 1,321 builtin objects.mock-fn.test.jsunder jest 30.5.2: the same 5 failures as on main, 47 pass.Left for later.
putDirect()on an object that Bun did not create, and abort on a WebAssembly GC object in the same way. This PR changesspyOnonly.Proxyover an extensible target still gets a spy that is not installed (bun:test: spyOn throws on missing properties and installs through Proxy #36395).String.prototype.lengthandrequire("module")._cache[file]still return a spy that is not installed. The direct store reports success there.spyOn,Object.freeze(object),mockRestore(), a named property is writable and configurable again, as on main.History of this PR. The first version checked
configurableandwritablefor each property before the store. A review found that it rejectedspyOn(Bun, "fetch")andspyOn(Bun, "env"): every entry ofbunObjectTableisDontDelete, and about 20 areReadOnly. The-tchange that was in this PR is now #45447.Other open PRs that edit the same function: #36395, #41396, #31628, #40382, #35449, #44833.
no test proof · iteration 4 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/test/bun-test.test.ts