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With the inspector on, the runtime transpiler appended `//# sourceURL=<module path>` after the inline source map comment, with the path bytes written raw. A line feed or a carriage return in the path ended the comment, and the rest of the path ran as code in that module. The source provider already carries the same path as its sourceURL(), and every reader of the directive falls back to it. JSC already discards the directive when the path has a space or a quote. For a non-ASCII path the directive was the UTF-8 bytes read as Latin-1, so stack traces showed a mangled path and a position that was not remapped. The debugger matches a breakpoint set by URL against the directive when there is one, so a breakpoint in a module under a non-ASCII directory never bound (#15035). It binds now.
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Status CI is green on the head (7cd0389) and all four review threads are resolved. The PR waits for a maintainer review. The head is 7cd0389: main at 017b243 merged in, one commit (24fe9b1) from a second self-review, and one commit (7cd0389) for two review findings. On this head (debug ASAN build, linux-x64), Reproduced on 1.4.3-canary.1+367d939d9 (linux-x64): The breakpoint tests are the two reproductions in #15035: The item that the self-review of 09-14 lost What is known: the first revision of this comment (2026-09-14 10:02 UTC) says that the run reported a "should-fix execution concern" and that its text was cut off. I never read the text, so I never addressed the item. I cannot say which concern it was, and nothing below is the recovered text. A second self-review ran on the merged head. It raised 21 concerns and found no defect in the source change. These are the concerns about execution, with what was done:
The other concerns are about the order of landing, the PR text, and CI. The body (Notes) and the sections below cover them. One recommendation is declined: to delete the CI Build 126776 ran on 24fe9b1: 180 of 181 jobs passed. Both changed test files ran and passed on all 11 test lanes, which include macOS x64 and the two Windows lanes. The one failure was Build 127710 ran on 7cd0389: 181 of 181 jobs passed. Neither changed test file is among the four tests that needed a retry. Open
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughInline sourcemap output no longer appends a module-path ChangesInline sourcemap debugging
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
|---|---|---|
| Linked Issues check |  |
Issue [#15035] requires debugger breakpoints to bind for projects with non-ASCII paths. src/jsc/VirtualMachine.rs removes the raw //# sourceURL= path write while retaining the inline source map. T… |
| Out of Scope Changes check | |
The source change directly fixes path encoding and line-break handling in inspector module text. The inspect helper and shared CDP fixture support the new inspector tests. The filesystem, plugin-ID,… |
| Title check | |
The title clearly and concisely describes the primary change: removing the //# sourceURL= comment from transpiled modules. |
| Description check | |
The description explains the problem, fix, impact, alternatives, and verification results. It provides the information required by the template, although it uses Problem and Fix sections instead of th… |
Full details: Linked Issues check
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Explanation
Issue [
#15035] requires debugger breakpoints to bind for projects with non-ASCII paths.src/jsc/VirtualMachine.rsremoves the raw//# sourceURL=path write while retaining the inline source map. The new inspector tests set URL breakpoints forscript_español/index.jsandñ.tsand verify a breakpoint pause. The implementation and tests meet the linked coding requirement.
Full details: Out of Scope Changes check
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Explanation
The source change directly fixes path encoding and line-break handling in inspector module text. The
inspecthelper and shared CDP fixture support the new inspector tests. The filesystem, plugin-ID, stack-path, and breakpoint tests validate the same path-handling behavior. No unrelated change is demonstrated.
Full details: Description check
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Explanation
The description explains the problem, fix, impact, alternatives, and verification results. It provides the information required by the template, although it uses Problem and Fix sections instead of the exact template headings.
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Inline comments:
In `@test/cli/inspect/inspect-inline-sourcemap.test.ts`:
- Around line 109-112: Replace the parameterized test declaration around the
inspect sourcemap cases with a describe.each block containing the LF and CR
inputs, then define the test inside it without parameterization. Keep isWindows
as the skip condition on the nested test and preserve the existing assertions
and test behavior.
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src/jsc/VirtualMachine.rstest/cli/inspect/inspect-inline-sourcemap.test.ts
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I reviewed this PR and didn't find any bugs. Because it fixes a code-injection path and changes inspector-visible output (dropping the sourceURL directive from Debugger.scriptParsed), a human familiar with the debugger tooling should confirm the removal-over-escaping call.
What was reviewed
on_source_map_chunkcapacity math:grow_if_needed(encode_len + prefix_len + 2)still covers the leading\n+ prefix + base64; the trailing\nuses fallibleappend, so noappend_assume_capacityoverrun.- New
inspect()helper: socket error/close and inspectee exit all reject the raced promise;disposeruns on both the setup-failure path and viaawait using; existing test's assertions are unchanged. - Tests follow harness conventions —
127.0.0.1:0,tempDir/using,Promise.allpipe draining,test.concurrent, combined{ stdout, exitCode }assertions, Windows skip narrowly scoped to the LF/CR filename cases with a stated reason.
Extended reasoning...
Overview
The Rust change removes the //# sourceURL=<path> trailer that SourceMapHandlerGetter::on_source_map_chunk appends to every transpiled module when the inspector is enabled. The path was written as raw bytes into a single-line comment, so an LF or CR in the module's absolute path terminated the comment and executed the remainder as code; non-ASCII paths were also mangled (UTF-8 bytes read as Latin-1), which broke Debugger.setBreakpointByUrl matching (#15035). The prefix_len reservation is shrunk to match, and the two append_assume_capacity calls for the sourceURL trailer are deleted. The test file gains a reusable inspect() helper (refactor of the existing test's plumbing) plus three new tests: LF/CR injection (ESM + CJS), non-ASCII stack-frame path/position, and the #15035 breakpoint-by-URL regression.
Security risks
The change removes an injection surface — raw path bytes are no longer written into program text on this path. I checked that no new user-controlled bytes are introduced into the printed output; only the base64 sourcemap and fixed literals remain. The residual risk is behavioral: dropping the sourceURL directive changes what Debugger.scriptParsed reports (the sourceURL param disappears). The PR argues every reader falls back to the provider's sourceURL()/url, and JSC already discards the directive for paths containing whitespace or quotes, so many users run without it today — but I did not independently trace every debugger-frontend consumer.
Level of scrutiny
Medium-high. The native diff is mechanically trivial and the capacity/append_assume_capacity invariant is preserved (over-reservation only, never under). But this is a security fix whose correctness depends on the design claim that the directive is fully redundant across all inspector consumers (JSC breakpoint matching, Zig::sourceURL stack frames, sampling profiler, CDP shim, VS Code adapter, Web Inspector UI). That enumeration is well-researched in the PR body, and the new tests exercise stack frames and breakpoint binding directly, but a maintainer who owns the debugger integration should sign off on remove-vs-escape.
Other factors
Test quality is strong: failure events are wired to reject awaited promises (no sleeps), resources are released via using/await using registered before assertions, subprocess pipes are drained concurrently, test.concurrent is used for independent spawns, the Windows skip is scoped to the two cases where the OS forbids LF/CR in filenames, and the variant matrix covers ESM + CJS × LF + CR. The refactor of the existing test preserves its assertions verbatim. No CODEOWNERS entry covers the changed paths. Bug-hunt exit reason was dry_streak with no findings.
…ect-drop-sourceurl-directive
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Updated 5:00 PM PT - Oct 17th, 2026
✅ @robobun, your commit 7cd0389e8803e511be2b5f0cffd4f848658d2709 passed in 🧪 To try this PR locally: bunx bun-pr 42705That installs a local version of the PR into your bun-42705 --bun |
…ile name Remove the doc comment on on_source_map_chunk. It described a write that no longer exists. Tests: - LF and CR in a module path run under --inspect and under inspector.open(). - LF and CR in a plugin module id (build.module and an onResolve namespace) run on every platform, because no file is needed. - The breakpoint test runs for a non-ASCII directory and for a non-ASCII file name, the two reproductions in #15035. It is no longer concurrent: on a timeout, bun:test kills the child processes of a test only when the test runs alone. - A CDP client over inspector.open() gets the real file URL in Debugger.scriptParsed, and a breakpoint set by that URL resolves.
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Inline comments:
Review comments at @test/cli/inspect/inspect-inline-sourcemap.test.ts:
- Line 43: Update the `proc.exited.then` chain to pass `fail` as its rejection
handler, so a rejected subprocess exit promise is handled as well as a resolved
exit code.
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src/jsc/VirtualMachine.rstest/cli/inspect/inspect-inline-sourcemap.test.tstest/js/node/inspector/inspector.test.ts
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline note, I also checked that the shrunken grow_if_needed reservation in on_source_map_chunk still covers every append_assume_capacity call (1 + prefix + base64 length fits in encode_len + prefix_len + 2), that nothing else in src/ emits a //# sourceURL= comment, and that the in-tree readers of Debugger.scriptParsed (src/js/internal/inspector/cdp.ts falls back to params.url; the DAP adapter reads only url) and the one existing test reading p.sourceURL all tolerate the param's absence.
Extended reasoning...
The change deletes the raw-path //# sourceURL= trailer from the inspector's inline-sourcemap path in src/jsc/VirtualMachine.rs and adds CDP-driven tests for LF/CR path injection, plugin module ids, and non-ASCII breakpoint binding. It touches a code-injection surface (path bytes written into program text) by removing the write rather than escaping it. An inline nit on the new inspector.test.ts fixture is being posted and a further verified finding is withheld, so this run does not approve.
…ect-drop-sourceurl-directive
… prelude - inspect(): pass a rejection of proc.exited to fail. Bun.spawn rejects that promise when the wait for the child fails. - inspector.test.ts: the two fixtures that are their own CDP client now share one prelude. A socket error or close before closeInspector() ends the fixture with exit code 1 and the cause on stderr.
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I reviewed the latest push and found no bugs; since removing the directive is a deliberate, protocol-visible choice (no more sourceURL on Debugger.scriptParsed, endLine shifts by one) that overlaps with #33866 and #40383, a maintainer's call on the approach is still worthwhile.
What was reviewed:
on_source_map_chunk: the reserve math still covers\n+ prefix + base64 (trailing\ngoes throughappend), and nothing else in the tree asserts on the inspector's old//# sourceURL=trailer.- Script naming after the removal:
Zig::sourceURLinsrc/jsc/bindings/ErrorStackTrace.cppfalls back to the provider'ssourceURL(), andcdp.tsalready readsparams.sourceURL || params.urland derives file URLs withpathToFileURL, so stack frames and CDP clients keep the path. - The literal
ñin the--inspect-waiturlRegexversus the percent-encoded URL asserted ininspector.test.ts: consistent, because raw JSC protocol reports the plain path whilecdp.tsconverts to a file URL andbreakpointUrlRegexmatches both spellings. - The shared
cdpClientPreludenow wiresonerror/oncloseto a nonzero exit, which covers the fixture-hang nit from the previous round.
Extended reasoning...
The change deletes the \n//# sourceURL=<raw path> write from the inspector's inline-sourcemap handler in src/jsc/VirtualMachine.rs (12 lines) and adds tests in test/cli/inspect/inspect-inline-sourcemap.test.ts and test/js/node/inspector/inspector.test.ts covering LF/CR-in-path code execution (ESM/CJS, --inspect and inspector.open(), plugin ids) and non-ASCII breakpoint binding. The security-relevant surface is the removed raw-path-into-program-text write, which the new tests exercise; no other injection or auth surface is touched. No CODEOWNER covers these files and the bug hunt ran dry, but the fix is a design choice with an acknowledged client-visible downside and textual overlap with two open PRs, which is what tipped this to defer rather than approve.
Fixes #15035
Problem
bun --inspect, a breakpoint set by URL never binds for a non-ASCII path such asscript_español/index.js(Problems with debugging Bun in VScode: UTF-8 unicode folders with the letter "Ñ" cause errors in breakpoints. #15035), anderror.stackshowsscript_español.on_source_map_chunk(src/jsc/VirtualMachine.rs:3897) appends//# sourceURL=<path>to each transpiled module with the path bytes raw. JSC reads the module as Latin-1, and a line break ends the//comment.Fix
//# sourceMappingURL=comment stays. @alii named this option in a review of #33866.sourceURL(), and every reader of the directive falls back to that.test/cli/inspect/inspect-inline-sourcemap.test.tsandtest/js/node/inspector/inspector.test.ts. All fail on 1.4.3. Alsotest/cli/inspect/,test/js/node/inspector/,test/regression/issue/28159.test.ts.Background
//# sourceURL=names a script. JSC stores it assourceURLDirective()on the source provider, which holds one module's text and itssourceURL().error.stack, which reads the directive first. Omitting the comment only for LF or CR keeps the non-ASCII bug.Downsides
Debugger.scriptParsedno longer sendssourceURLfor a module. A client that reads it with no fallback tourlloses the name.scriptParsed.endLinedrops by one.Notes
Self-review. The status comment lists the 21 concerns and what was done for each. One recommendation is declined: to delete the
no test proofblock at the foot of this text. Automation writes that block after a push. The measured results are at the end of these notes.Who can reach the write. The path is
source.path.text. It is the absolute path of an imported file, or the id of a module that a plugin serves (build.module(), or anonResolvenamespace). The plugin route needs no file, so it works on a platform where a file name cannot hold a line break. The inline source map is on when the inspector runs outside Connect mode: the--inspect*flags andinspector.open().Not fixed here.
Other places write path bytes raw into program text. They need an escape, not a removal, so they are separate changes:
MacroEntryPoint::generate(src/bundler/entry_points.rs:234) writes the macro path into a single-quotedimport('...'). A quote in the path runs the rest of the path as JavaScript, with or without the inspector. Escape the macro path and export name in the generated macro entry module #42706 is open for it.bun build --sourcemap=linkedfooter and thebun checkdeclaration map footer (src/sema/check/errors_declaration_emit.rs:866) write the file name raw after//# sourceMappingURL=. bundler, bun check: percent-encode the sourceMappingURL comment #42670 is open for both.url()), bundler(html): percent-encode output paths written into src and href, and serve them under that name #41793 (HTMLsrcandhref)..source, a template.raw) has the same cause: JSC gets the module as Latin-1. Preserve non-ASCII in regex .source and tagged template .raw #33866 is open for it, on top of Build the source excerpt for errors from 16-bit module sources #38708, Build the coverage line table in UTF-16 code units #38710 and Decode module text that comes from disk or bundler output as UTF-8 #38714.What
Debugger.scriptParsedanderror.stackreport, before and after (linux-x64, release 1.4.3-canary.1 against this branch):sourceURLparamplainurlsourceURLparam, same framewith space,it's,a<U+00A0>b,dir-à,Рабочий,根sourceURLparam, same framesub-é-中,español,рабочийsub-é-ä¸Row 2 is every path with a byte 0x09 to 0x0D, 0x20, 0xA0,
"or'before its last byte. The UTF-8 form ofà,Рand根has a 0xA0 byte, which JSC reads as a no-break space. So a non-ASCII path is mangled only when it has none of those bytes. The fixture names in the tests have none, and a comment in the test file says why.U+2028 and U+2029 do not end the comment, because JSC reads their UTF-8 bytes as three Latin-1 characters. Only LF and CR do. A Windows file name cannot contain either, so the line break tests with file names skip on Windows. The plugin id tests and the non-ASCII tests run on every platform.
Why the directive is redundant.
ResolvedSource.source_urlis built frompath.textnext to each print call:src/runtime/jsc_hooks.rs:3259,src/jsc/RuntimeTranspilerStore.rs:548,src/jsc/AsyncModule.rs:1171.Zig::SourceProvider::create(src/jsc/bindings/ZigSourceProvider.cpp:76) passes it to JSC as the provider'ssourceURL().Readers of the directive, all with a fallback to the provider URL:
InspectorDebuggerAgent::didParseSource:hasSourceURL ? script.sourceURL : script.urlfor breakpoints.scriptParsedalways sendsurl.Zig::sourceURL(src/jsc/bindings/ErrorStackTrace.cpp:360): directive, thensourceURL(), then theSourceOrigin.src/jsc/bindings/JSInspectorProfiler.cpp:130: theurlof a precise coverage entry.SamplingProfiler.cpp:963reads the directive only whensourceURL()is empty.:1172writesurlandsourceURLas two keys.src/js/internal/inspector/cdp.ts:567:params.sourceURL || params.url. This is theurlthat a CDP client ofinspector.open()gets.Models/Script.js:contentIdentifier,displayName, anddisplayURLall readurlfirst.packages/bun-debug-adapter-protocolreads onlyurlandsourceMapURL. debug-adapter: support breakpoints in Vite SSR modules #45222 (open) changes it toevent.url || event.sourceURL, which still readsurlfirst.BUN_INSPECT_CONNECT_TOmode writes no trailer at all (SourceMapHandlerGetter::get), and that debugger works fromurlalone.JSC's directive parser (
Source/JavaScriptCore/parser/Lexer.cpp,parseCommentDirectiveValue): the value stops at whitespace (0x09 to 0x0D, 0x20, 0xA0),", or'. If anything but a line terminator follows, the directive is a null string.Loaders that reach this printer path:
js,jsx,ts,tsx,text, andmd.json,jsonc,toml,yaml,json5, andxmlreturn an object without a print (src/runtime/jsc_hooks.rs:2786), which is why a.jsonimport does not reproduce.History. #4213 added the directive together with the inline source map, with a
TODO: do we need to %-encode the path?comment and no stated reason.Overlap with open PRs.
inspect()and the tests from here, and builds itsruntimeSourceMap()oninspect().inline_trailerbuffer and keeps the raw write ofsource.path.text. It conflicts textually with this change. The resolution is to leave out the//# sourceURL=constant, its two reserve terms, and the two appended slices. The new tests fail if they come back.Alternatives considered.
Zig::sourceURL(src/jsc/bindings/ErrorStackTrace.cpp:366) returns the directive ahead of the real path, soerror.stackand the inspector would show the encoded path for every path with a space or a non-ASCII character.Test files. In
inspect-inline-sourcemap.test.tsthe existing test's socket setup moved into aninspect()helper so the breakpoint tests can share it. Ininspector.test.tsthe existingscriptParsedFixtureand the new fixture share one CDP client prelude, which ends the fixture with exit code 1 if its socket fails. The assertions of the existing tests are unchanged. The breakpoint tests cover both reproductions in #15035 (script_español/index.jsandñ.ts). They are not concurrent: on a timeout,bun testkills the child processes of a test only when the test runs alone (src/runtime/test_runner/Execution.rs:316), and that inspectee waits for a debugger.Measured on this branch (main at 017b243 merged in, WebKit pin 87ee10da08, debug ASAN build, linux-x64).
inspect-inline-sourcemap.test.tspasses 10 of 10 andinspector.test.tspasses 25 of 25. All oftest/cli/inspect/,test/js/node/inspector/, andtest/regression/issue/28159.test.tsgive 129 pass, 5 todo, 0 fail in 11 files. Release 1.4.3-canary.1 fails the 10 new tests. The JSC readers and the directive parser were read at that pin. No other code insrc/orpackages/writes a//# sourceURL=comment.no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/inspect/inspect-inline-sourcemap.test.ts