[robobun]

Related to #32596 and #24000. Supersedes #32599 and #45087.

Problem

• new Bun.Glob("src/{a,b/c}/index.ts").scan() lists nothing, and match() accepts both files. In 1.4.4 too.
• build_pattern_components (src/glob/GlobWalker.rs:2184) cuts the pattern at each separator, also inside a group. The shell, workspaces, --filter and bun lint use this walker.

Fix

• The splitter asks the matcher's tokens which groups have a separator inside. With none, the cut is as before.
• The path segments of those groups are one Crossing component. The walker lists what match_prepared accepts below it, and Below::may_match rules directories out. After it, the cut is as before.
• Verified: test/js/bun/glob/scan.test.ts, and the shell, workspace and lint tests.
• Self-reviewed: 36 concerns raised, 31 addressed (rest: see notes).

Background

• A component is the pattern part that the walker matches one name with.
• match_prepared matches a whole path. Below says if a path below a directory can match.
• Considered: written-out alternatives (glob: expand brace groups that span path separators when scanning #32599), which need a limit and have no form for +(a/). Considered: the matcher also reads the rest of the pattern, which finds no link or .. there.

Downsides

• workspaces: ["{apps/web,packages/*}"] now has members, so an older lockfile fails --frozen-lockfile until the next bun install.
• Release text: +15,616 bytes. A { before a separator ({src,test}/**/*.ts) costs about 2,000 instructions and 1 allocation per scan. *.ts: 5,106 glob instructions (main 5,125).
• With a ** in the group's segments, the matcher reads the rest too and follows no link named there.

Notes

Order. #45885 (matcher: the dot rules for a class that starts with () is best first. Until it lands, {flat/[(.]a,zz/y} lists the hidden flat/.a without dot: this walker asks match_prepared with Dots::Hide. #41558 changes two rules of the same walker: the dot rule for each alternative, and the rule for a link that a segment without a wildcard names. The link rule was #45889. That PR is closed, and its commit e879a0d376 is part of #41558 now. The link rows of scan.test.ts say what this walker does now. Their comment still names #45889.

Self-review. The diff was reviewed two times before this push. The first review took out absolute alternatives, a rule that listed a directory for an alternative that ends with /, and every change to a pattern with no such group. The second review found that the cut after the group was a list of rules with counterexamples. This cut has fewer: no byte-level bracket counter (the matcher's tokens decide, which also removed a panic for a pattern with a byte that is not UTF-8), no whole-pattern negation, no special case for . and .., and a group with only a ** in it is not a trigger. Five points are not done:

• docs/guides/ecosystem/tanstack-start.mdx:413 and a line for the workaround in glob.mdx (fs.globSync(pattern, { cwd }), or $.braces(pattern).flatMap(p => [...new Glob(p).scanSync(opts)])). The workaround is for a release that does not have this change.
• One crossing also takes the plain path segments between two groups with a separator. A link or a . that is named there is for the matcher.
• A ** that is glued into a name ({a**/c,b}) counts as one that matches any number of directories.
• The matcher reads a ** right after a group as a *. The test.failing rows are for this. It has no tracker from this PR.
• workspaces reads {a,b/c} as one pattern. npm reads it as the entries a and b/c. Two test.failing tests in bun-workspaces.test.ts have the two cases where that matters (a link with a ** in the group, and ../shared as an alternative). If npm's reading is wanted, process_names_array (src/install/lockfile/Package/WorkspaceMap.rs:381) is the place, for a maintainer to decide.

Who has such a pattern. #32596 and #24000 are the reports for braces, and #25789 was a fix from the community: three reporters since Bun.Glob shipped, all with a comma brace. A list of patterns joined into one group is the common source: the guide docs/guides/ecosystem/tanstack-start.mdx:413 joins its patterns with , and puts { and } around them for Bun.Glob. A comma brace has the fault in 1.4.3 too. A separator in @(..), +(..) or !(..) is new with #45043, which is in 1.4.4. Nobody asked for those: the reason to do them here is that match() and scan() have two answers for them in 1.4.4. Node 26 fs.globSync, fast-glob, npm 11 and bash list the matches of a comma brace with a separator.

The rule. The crossing is the path segments from the first group with a separator inside (or from the first ** before it) to the last such group. Before the crossing and after it, the walker reads the pattern as it did. In the crossing, the scan lists the entries whose path match() accepts, for the pattern with its empty path segments dropped. The crossing keeps the rest of the pattern in three cases: it can match any number of directories (a **, or a group that repeats with a separator inside), a !( is in it or after it, or only separators follow. A pattern that ends with a separator lists only directories, as before.

What changes for a user.

• A group with a / in an alternative lists its matches: {..}, @(..), ?(..), +(..), *(..), !(..), groups in groups. In a group, a class or an escape with a separator counts as one: {a[/]b,c}/d lists a/b/d and c/d.
• After the group, a name is a path segment of its own, as after {a,b}: a link with that name is followed, a . or .. names a directory, and a last name is one stat in the directory. {a,a/b}/x lists what a/x and a/b/x list.
• bun install, bun run --filter and --workspaces find the members of such a workspaces entry. On main bun install printed "No packages! Deleted empty lockfile" and exited 0. The other direction is true too: the new lockfile fails --frozen-lockfile on 1.4.3. With the alternatives as separate entries, both versions write the same lockfile. A member that was its own project is now resolved at the root, and its scripts run. bun <file> already read such an entry with match() (WorkspaceMap::lists, install: fix regressions and older bugs found after the package manager consolidation #45307, in 1.4.4), so on main it and bun install had two answers.
• Shell: echo src/{lib,b/c}/*.ts was bun: no matches found, exit 1. It now prints src/lib/*.ts src/b/c/*.ts and then the files, exit 0. That is what {lib,b} does on main, and shell: glob each brace variant in one pool task, and keep a variant with no match #33423 is the change for it. So rm {a/b,c}/*.tmp removes the files and then fails for the two words that it could not expand, as rm {a,c}/*.tmp does on main.
• bun lint: import/resolver with project: "{packages/a,packages/b}/tsconfig.json" reads the two files.
• {a,b/c} no more lists a path made of the directory {a,b and the entry c}.
• A pattern that starts with ! is cut as before: the ! negates its first path segment. A group with only a ** in it ({a,**}/x) is one name, as before. Both list less than match() accepts, on main too.
• A pattern with no separator inside a group gives the result of main. 180,000 generated patterns (classes, escapes, !, . and .., links, brackets that are not closed) went through a release build of main and of this change: the 70,980 without a separator inside a group list the same paths, and for none of the 180,000 does main list a path that this change does not.

How it was checked.

• BUN_GLOB_FUZZ_ITERS=5000 BUN_GLOB_FUZZ_SEED=<n> bun bd test test/js/bun/glob/scan.test.ts -t "what match" --timeout 900000 runs two generators through Bun.Glob.scanSync, with match() of the same build as the oracle: one group in a real path, and groups in groups with ./ and a/../ prefixes, absolute, onlyFiles: false and dot. 30 seeds, about 750,000 scans, 0 differences. The default run is 200 patterns each.
• bun install with workspaces: ["{a\xC3}/b}/x{/y"] (one byte that is not UTF-8) exits 0, as on main. An earlier cut of this PR stopped there with slice index starts at 8 but ends at 7. The test is in bun-workspaces.test.ts.
• No test here reaches the entries of a file system that gives no entry kind (FileKind::Unknown). They go through the same functions.
• As a user that is not root, the rows of "does not open" pass: a directory with mode 000 that no path of the pattern goes through is not opened. They are skipped for root.

Numbers. Linux x64, release builds of main 91e7e3b with and without this change. Instructions are counted in the symbols of the bun_glob crate under qemu, per scanSync, with the JIT off, over a tree of 456 files.

pattern	main	this PR
*.ts	5,125	5,106
**/*.ts	266,493	265,573
**/node_modules/**/*.js	213,460	212,595
node_modules/*/lib/*.js	73,999	74,026
packages/*/src/**/*.{ts,js}	97,798	97,811
packages/*/package.json	22,411	22,769
src/{d0,d1}/*.ts	17,122	18,897
{src,node_modules}/**/*.ts	150,050	152,105
{apps,packages}/*/package.json	33,637	36,737

• The last three rows have a { before a separator, so the splitter asks the matcher one time: that is the difference, and 1 more allocator call per scan (85.4 to 86.4, 889.05 to 890.05, 328.5 to 329.5). The other rows have the same number of allocator calls as main (*.ts: 23.3, **/*.ts: 1,771.2, counted as entries into malloc, calloc and realloc of the whole process). A ( that is not after one of ?*+@! does not make the splitter ask.
• File system calls per scanSync (openat, getdents64, close, newfstatat): 4 for *.ts, 760 for **/*.ts, 102 for {apps,packages}/*/package.json. Main has the same counts.
• Release text: 81,665,765 to 81,681,381 bytes. The stripped binary is 16,384 bytes larger. The generic walker has five copies, and most of the bytes are in them.
• WorkItem keeps its size: followed_links_len is a u32 now, which pays for the new field. GlobWalker has one pointer more.
• A group with a separator, 30 workspace members: {apps/*,packages/*}/package.json costs 133,790 instructions, 338.5 allocator calls and the same 102 file system calls as {apps,packages}/*/package.json. With 300 members it costs 600,026 instructions, and the plain group 267,172: the same for 3 and for 300 entries in each member, because the last name is one stat.
• svc/{src/s1.ts,src/s2.ts} reads 3 of 190 directories and costs 93,610 instructions. 32,419 of them are the cache that the matcher makes for a pattern after its 16th path (Program::CACHES_AFTER).
• **/{b/c,lib}/*.ts reads every directory, as **/*.ts does (760 file system calls), and costs 725,674 instructions: the matcher reads each entry.
• Long patterns stay linear. Instructions per scan at N = 1,000, 2,000, 4,000: {**/,**/} x N + x: 8.18 M, 16.37 M, 32.79 M. {a/,} x N + x: 4.47 M, 8.98 M, 18.05 M. { + [ x N + /q,a/x,x}: 1.34 M, 2.65 M, 5.28 M. [ x N with no group: 418,623 (main 407,647) at 1,000.

Not in this PR.

• After the crossing, the walker reads each path segment by its own rules, which are older than this PR and are not what match() says in a few cases: a ! that starts a segment negates it ({a,b/c}/!x lists every name but x, as a/!x does), a \ before a plain character matches nothing, a literal last name with a / after it is looked up as a file too, and a group segment does not match a name that starts with a dot (glob: honour backslash escapes of non-special characters in scan() #32876, and glob: let a brace alternative name a dotfile or a symlink in scan #41558 for a dot name in a group). The table "lists ..., and ... lists ..." in scan.test.ts has the two readings side by side, and "{a,zz/y} and a before ... list the same" has the rows for what is after the group.
• A crossing that keeps the rest of the pattern (a ** before the group or in its path segments, a group that repeats, a !(): a name after the group is for the matcher. A link with that name is followed only with followSymlinks (glob: match explicitly-named dotfiles and resolve literal paths through symlinks #32853 is the rule for a name), and a . or .. lists nothing. Main lists nothing for these patterns.
• A class that can match a separator without one in its text ([!x], [,-0]) does not make a group a trigger: {a[!x]b,c}/d lists c/d, and match() also accepts a/b/d. Such a group works on main as one name, and a crossing for it would change the results and the cost of patterns like src/{[!_]*,index}.ts. picomatch does not let a class match /.
• A group with only a ** in it ({**,a}/x.js) lists one level, as on main. Node lists every level. @(a|**) is not a ** for minimatch or picomatch.
• new Bun.Glob("*(**|s)/c").match("sc") is true: in a group that repeats, a ** that ends an alternative also matches nothing in the middle of a name. picomatch and minimatch say false. In a crossing the scan follows match(), so {*(**|s)/c,zz/y} lists sc too. The matcher has its own fix for this.
• These are bugs of main that were found here and have their own fixes: a/lnk/../x, with lnk a link to a directory, looks x up in the directory that the link points at. **/a/./x.js and **/a/../x.js list nothing. bun pm pack does not un-ignore with !dist/{a,b/c}/keep.js in .npmignore.
• bun install takes a member that is a link only if the crossing has no ** and no group that repeats: ["{apps/**,packages/*}"] does not take the link packages/s, and ["apps/**", "packages/*"] does.
• bun run --filter and --workspaces go through a link to a directory below such a crossing, as they do below packages/** on main: their walker gets a link to a directory as a directory. So for ["{apps/**,packages/*}"] they run the script in the link packages/s, which npm 11.16.0 also takes, and bun install does not take it.
• A ** right after a group is a * for the matcher, on 1.4.3 and on main too: {src/,svc/}**/*.ts lists the files one level down, and not src/index.ts. Node lists all of them, and so do the alternatives written out.
• src/{,b/c}/index.ts lists only src/b/c/index.ts, as match() says. Node also lists src/index.ts.
• Outside a group, a[/]b/d and a\/b/d are cut at the /, as before.
• Absolute alternatives ({/a,/b}/*.js) list nothing, as before. A walk for each was built and taken out: a workspaces entry could reach a linked folder outside the project through it. The code is on the branch robobun/ca1fc5f1/glob-tail-absolute-roots.
• new Bun.Glob("/abs/file.ts").scanSync() lists nothing, with and without this change (Bun Glob does not work with absolute paths #16709, glob: return absolute literal patterns from scan()/scanSync() #34989).
• Lists of patterns are Support multiple patterns in Bun.Glob #9470, and a negated entry in a list is Support ignores in Bun.Glob options #8182: {src/**/*.ts,!src/**/*.test.ts} now lists every file, the test files too.
• bun lint, bun fmt and bun pm pack have their own checks for "can a path below this directory match" (Pattern::may_match_inside, Minimatch::may_match_inside, negation_reaches_below). They do not use Below.
• Windows: type-checked for x86_64-pc-windows-msvc and aarch64-apple-darwin. It did not run here. The crossing gives the matcher its paths with /, so a class with a / matches there too. The walker keeps the pattern as written, so an absolute pattern with backslashes has its root as before.

Suites. With the debug build: the group block of scan.test.ts and its block for names that are not UTF-8 (213 pass), match.test.ts (578), path-length, proto, stress, test/js/node/fs/glob.test.ts (34), brace.test.ts (49), bunshell.test.ts (467), filter-workspace.test.ts (137), bun-workspaces.test.ts (293), compile-asset-bunfs.test.ts (10), the "is a member" rows of run-autoinstall.test.ts (25), the rows of check.test.ts and config-files.test.ts, and test/internal/source-lints/. With the release build on main 91e7e3b: scan.test.ts (407) and leak.test.ts (4). Six tests of scan.test.ts that scan this repository time out in the debug build here, with and without the change.

[robobun]

^{Updated 1:17 PM PT - Oct 21st, 2026}

✅ @robobun, your commit 00f635d3a967ac5c75d4099811c8219da6e2e55b passed in Build #130153! 🎉

---

🧪   To try this PR locally:

bunx bun-pr 45745

That installs a local version of the PR into your bun-45745 executable, so you can run:

bun-45745 --bun

[robobun]

Status: ready for review.

• Reproduced on main (91e7e3b, release build): new Bun.Glob("src/{a,b/c}/index.ts").scanSync({ cwd }) lists nothing, and match() on the same glob accepts src/a/index.ts and src/b/c/index.ts. The same is true for @(a/x|b/x).js, ?(a/)x.js, +(a/)x.js and *(a/)x.js. A script with these five patterns: 5 of 5 wrong on main, 0 of 5 with this change.
• bun install with "workspaces": ["{apps/web,packages/*}"] prints No packages! Deleted empty lockfile and exits 0 on main. With this change the lockfile has apps/web and packages/one.
• This PR: glob: scan a group that crosses a path separator with the matcher #45745.

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Walkthrough

Changes

The glob matcher and walker now support brace and extglob alternatives that cross path separators. Tests cover scan behavior and command-line consumers, including workspace filtering and installation. Documentation and benchmarks cover the new grouped patterns.

Separator-crossing glob patterns

Layer / File(s)	Summary
Directory-prefix matching src/glob/matcher.rs	The matcher distinguishes directory-prefix checks from full-path matching. A new helper checks whether a directory prefix can lead to a match.
Crossing parsing and traversal src/glob/GlobWalker.rs	The walker parses crossing groups, tracks crossing-relative paths, evaluates entries, handles symlinks, and prunes directory traversal.
Glob scan and shell validation test/js/bun/glob/scan.test.ts, test/js/bun/shell/*, test/bundler/compile-asset-bunfs.test.ts	Tests cover separator-crossing groups in scan, shell, and bundler cases, including sync, async, absolute, dotfile, symlink, interpolation, and error scenarios.
Workspace and CLI consumers test/cli/install/bun-workspaces.test.ts, test/cli/run/*, test/cli/check/check.test.ts, test/cli/lint/config-files.test.ts, docs/pm/workspaces.mdx, docs/runtime/glob.mdx, test/js/bun/glob/scan.test.ts	Tests and documentation cover workspace matching, filtering, installation, root discovery, lockfiles, invalid input, TypeScript resolution, and HTML entry-point checks.
Grouped scan benchmarks bench/glob/scan.mjs	Benchmarks compare grouped scans with separate pattern scans.

Suggested reviewers: jarred-sumner

Priority: Normal

Merge Risk: Low · up to 00f63

Glob scanning across path separators is implemented with broad coverage. One rare class-pattern form, such as {a[.-0]b,c}, can still scan differently from match(). The author documents it as out of scope, so the risk of merging is low.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly identifies the main change: scanning groups that cross path separators with the matcher.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The description is complete and relevant. It explains the problem, implementation, verification steps, performance impact, limitations, and compatibility effects. It covers the template requirements t…

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Actionable comments posted: 1

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Inline comments:
Review comments at @test/js/bun/glob/scan.test.ts:
- Around line 1707-1724: Update the “long patterns are read once” test to build
its repeated pattern segments with Buffer.alloc(...).toString() instead of
String.prototype.repeat, following the existing pattern in the file. Replace the
fixed 5,000 ms wall-clock budget with a debug-aware budget or otherwise avoid
flaky timing failures on slower build configurations; preserve the test’s scan
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[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

[robobun]

A note on sequencing with #45885.

The walker in this PR asks match_prepared with Dots::Hide. On main that call depends on the order of the members of a class: [(.]a takes the dot of .a and [.(]a does not. #45885 fixes that in the matcher, and its diff applies on this branch. It is best if #45885 lands first.

A scan row such as {flat,x/y}/[(.]a (no hidden entry listed) belongs here, because #45885 cannot test scan on main.

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Inline comments:
Review comments at @src/glob/GlobWalker.rs:
- Line 2477: Update the Token::Class handling in crossing_groups to detect
separator membership using class_shape’s may_be_separator result rather than
searching class text for a literal slash. Expose a pub(crate) helper near
class_shape in matcher.rs and call it from GlobWalker’s class branch, preserving
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[claude]

I re-reviewed the new push and found no bugs; the four points from the earlier pass (a link named after the group, ./.. after the group, a bare (name) inside the group, the class check) are now covered by code and rows in scan.test.ts. Because this rewires the walker that bun install, --filter, the shell and bun lint all share, a human look at the Crossing design is still worthwhile.

What was reviewed:

• token_at's no_class_from shortcut: under class_end's rules an unclosed [ implies every later [ is unclosed too, so returning Literal past that index cannot hide a real class.
• Crossing::enter/path_len length bookkeeping across Directory pops, the enter_crossing split, and the Symlink pop: the suffix taken from dir_path always stays within it, and the RefCell<Entered> borrows never nest.
• Untrusted-pattern paths in crossing_groups/has_separator/is_unbounded: every index comes from the matcher's tokens, no byte-level counters; the non-UTF-8 workspace pattern and the long-pattern rows exercise them.
• Shell interpolation of ,, [..] and ! into a group with a separator stays literal (bunshell.test.ts), and the two test.failing workspace rows document the npm-reading gap rather than hide it.

Extended reasoning...

The change adds a SyntaxHint::Crossing component to src/glob/GlobWalker.rs (about 460 lines) so a brace or extglob group containing a path separator is matched by the matcher against paths relative to the directory the group starts in, plus a Below pruning oracle and a no_class_from cache in src/glob/matcher.rs. The walker is shared by Bun.Glob, the shell, workspaces, --filter, --check and bun lint, so the security-relevant surface is shell interpolation into glob words and workspace member discovery; both have new tests and no issue was found. The bug hunt ended with a dry streak and the earlier inline findings were addressed by commit f094c9c, but the size and the new cross-component state (Entered, crossing_path_len) make this too large and design-heavy to approve without a human reading it.

[claude]

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.