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WalkthroughThe glob implementation now loads minimatch lazily, compiles supported patterns directly, updates globstar handling, and exposes test helpers. Tests verify parity, delegation, pattern limits, and loading behavior. A benchmark measures synchronous and asynchronous glob calls. ChangesGlob matching and traversal
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to The behavior change appears mergeable, but both new parameterized test blocks should first be updated to follow the repository requirement. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Status How I reproduced it: Where the time went: This PR holds only the pattern compiler and the move of minimatch. The walk changes are in #42963. CI: build 116684 passed, 181 of 181 jobs. All review threads are resolved. The PR is ready for a maintainer. PR: #42874 |
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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 findings, I also checked whether compilePlainPattern diverges from minimatch on case-insensitive platforms: literal segments stay plain strings there too because createMatcher passes nocaseMagicOnly: true (minimatch toMMPattern only builds an /i RegExp when the segment has magic), and every level-2 preprocess rewrite (firstPhasePreProcess) needs an empty, ., .. or repeated ** segment, all of which the plain compiler sends to minimatch.
Extended reasoning...
Two findings are already posted inline. Separately, I diffed the plain-pattern compiler in src/js/internal/fs/glob.ts against src/js/internal/fs/minimatch.ts: toMMPattern (minimatch.ts:811-826) returns the unescaped string for a magic-free segment when nocaseMagicOnly is set, which createMatcher sets, so a literal like README is a string in both compilers on macOS/Windows; parse() (minimatch.ts:1781-1819) installs the same starTest/starDotExtTest[Nocase]/starDotStarTest/dotStarTest functions the new code mirrors, with starDotExtRE rejecting + @ ! ? * [ ( in the suffix, which the plain compiler also rejects; and the optimizationLevel-2 rewrites in firstPhasePreProcess/secondPhasePreProcess (minimatch.ts:1477-1555) only fire on "", ., .., or adjacent ** segments, or on multiple globParts from brace expansion, none of which reach the plain path. This is informational only; the inline findings still warrant a human look.
One verified lower-impact observation (a convention, logging or cleanup point) was not posted.
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Updated 12:52 PM PT - Sep 16th, 2026
✅ @robobun, your commit be4f33c59e73f4943010ddbc8e789741c24dd997 passed in 🧪 To try this PR locally: bunx bun-pr 42874That installs a local version of the PR into your bun-42874 --bun |
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I re-reviewed the two follow-up commits and found no new bugs; the un-awaited prefetch readdir now goes through Cache.prefetchReaddir() with a rejection handler (plus the new sort-failure test), and cachedDirent uses $isPromise. Because this is a ~2,400-line change that adds a second pattern compiler which must match minimatch's set/globParts output exactly, a human look at the equivalence argument is still worthwhile.
What was reviewed this round:
prefetchReaddir: the handler attaches to the async wrapper promise, and the cached promise gets its handler through adoption, so a laterreaddir(path)still rejects to the consumer only.- Shared
#cacheKeysacrosschild()patterns:cacheKey(index)depends only on#globStringsand the index, which every child shares, so memoizing in one array is sound. joinPrefix(dir) + namevsjoin(dir, name): readdir names carry no.,..or separator, and the literal-name branch still callsjoin.
Extended reasoning...
Overview
The PR reworks src/js/internal/fs/glob.ts (the port of Node's lib/internal/fs/glob.js): the vendored minimatch moves verbatim into a new lazily-required module src/js/internal/fs/minimatch.ts (registered in ProcessBindingNatives.cpp), a new compilePlainPattern()/compilePlainSegment() fast path builds the {set, globParts} shape directly for patterns made of literal names, **, *, *<suffix>, *.* and .*, the async walk prefetches up to eight queued directories' readdir, cache-key strings are memoized per pattern family, and joinPrefix replaces a per-entry path.join. test/js/node/fs/glob.test.ts gains a differential test between the two compilers, sync-vs-async equality checks, and (since my prior review) a spawned test that a readdir failing inside sortDirents rejects the iteration rather than surfacing as an unhandled rejection.
Changes since the prior review
Commit 9b694f9 adds Cache.prefetchReaddir(), which calls this.readdir(path).$then(undefined, nullOnReject) and is used both for the root readdir started alongside the root lstat and inside #prefetch(). Because readdir is an async method that returns the cached promise, the outer promise adopts the cached one (attaching a reaction to it) and the outer promise gets the no-op rejection handler; the next readdir(path) call from #iterateSubpatterns creates a fresh wrapper that rejects to the consumer. The new test exercises both the root and a queued directory and asserts stderr is empty. cachedDirent now uses $isPromise instead of instanceof Promise. The optional primordial-safety nit on startsWith/bind in the hand-written matchers was not taken up; that exposure is the same the base already had through minimatch's own arrow functions, so it is not a regression. Commit fd88ae3 only shortens comments.
Security risks
No auth, crypto or network surface. The fast-path compiler operates on user-supplied glob strings but only classifies characters and splits on /; anything it does not fully understand falls back to minimatch, and it refuses patterns over 65,536 characters where minimatch would throw. Prefetching starts at most eight extra readdir calls per visited directory and only for paths a parent readdir already reported as directories, so a consumer that breaks early leaves bounded work behind. Nothing here changes what paths are reachable relative to the base behaviour.
Level of scrutiny
High. This is hot-path Node-compat code, the change is large, and correctness rests on an equivalence argument (that the plain compiler produces exactly what minimatch would, including nocase on Windows/macOS and dotfile handling) that the in-repo differential test covers for patterns up to two segments but which a human familiar with minimatch's parse() should still sanity-check. The prefetch changes the timing of I/O in the async walk while claiming results and order are unchanged; the sync-equals-async tests support that, but it is exactly the kind of refactor REVIEW.md asks to treat as guilty until proven behaviour-preserving. The bug hunt exited on a dry streak and my own spot checks (cache-key sharing, joinPrefix, the rejection-handler wiring) held up, but I do not have the confidence needed to say no human needs to look.
Other factors
The PR description includes benchmark numbers and a description of a 16,500-case differential run, though only the in-repo tests are verifiable here. Both of my prior inline findings were addressed by code changes and a test rather than by resolving threads, which is why this run acknowledges progress rather than repeating them.
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The vendored minimatch moves from the bottom of internal/fs/glob into its own internal module, which lazyMinimatch() requires on first use. The block is de-indented, and one upstream comment says "To do" where upstream has the marker that this repo's diff lint rejects. The code does not change.
fs.glob, fs.globSync and fs.promises.glob compile a pattern whose segments are "**", a name, "*", "*<suffix>", "*.*" or ".*" without minimatch. minimatch tests these forms with string functions and does not rewrite such a pattern, so the compiled pattern is the same. Every other pattern goes to minimatch, which is then the only thing that loads internal/fs/minimatch. bench/glob/node-fs-glob.mjs measures the first, second and later calls of fs.globSync and fs.promises.glob in fresh processes, on bun and on node.
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Actionable comments posted: 1
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Inline comments:
In `@test/js/node/fs/glob.test.ts`:
- Line 367: Replace the parameterized it.each(plain) and it.each(notPlain)
blocks with describe.each() blocks, keeping one it() test case inside each and
preserving their existing assertions and behavior.
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bench/glob/node-fs-glob.mjssrc/js/internal-for-testing.tssrc/js/internal/fs/glob.tssrc/js/internal/fs/minimatch.tssrc/jsc/bindings/ProcessBindingNatives.cpptest/js/node/fs/glob.test.ts
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Problem
fs.glob,fs.globSyncandfs.promises.globare slower than in 1.3.14, since fs: port Node.js v26.3.0 fs tests and fix the gaps they surface — cp error semantics, watcher event delivery, watch ignore+AbortSignal, FileHandle pull/writer, glob port, opendir/Dir, mkdtempDisposable, rmdir-recursive end-of-life, mock.fn (+119 tests) #31830 replaced theBun.Globwrapper with a port of Node'sglob.jsand a vendored minimatch. The firstfs.globSync("*.txt")in a process went from 0.8 ms to 5.8 ms. Node v26.3.0 needs 3.4 ms.lazyMinimatch()insrc/js/internal/fs/glob.tsparses 2,000 lines and runs them cold.Fix
compilePlainPattern()compiles a pattern whose segments are**, a name,*,*<suffix>,*.*or.*. minimatch tests these forms with string functions and does not rewrite such a pattern, so the compiled pattern is the same. Every other pattern goes to minimatch.internal/fs/minimatch(the first commit, a pure move). A plain pattern never loads it.fs.globSync("*.txt"): 5.8 ms to 2.3 ms. Firstfs.promises.glob: 7.6 ms to 4.0 ms. Later calls: 0.086 ms to 0.053 ms.test/js/node/fs/glob.test.ts(new: both compilers agree on every pattern of up to two segments),test-fs-glob.mjs(448 pass). Self-reviewed: 7 concerns raised, 5 addressed (Notes).Background
glob.jswalks withreaddirand matches one path segment at a time. minimatch only compiles the pattern: per segment a string, theGLOBSTARsymbol, or an object withtest(name).require, and each function is compiled at its first call. That cold JavaScript is most of a first call.Notes
Numbers. Release builds of the same commit with and without this change, Linux x64, tmpfs,
bench/glob/node-fs-glob.mjs(new), median of 21 fresh processes, ms. The box was under load (load average 55), so compare rows, not absolute values.first,second: that call in the process.later: median of 100 more calls."*.txt"in a directory of 20 files:**/*.rsoversrc/of this repo (1,525 results): the firstglobSyncgoes from 35.2 ms to 24.5 ms. Later calls do not change (17.1 ms and 16.8 ms). The walk itself is the subject of #42963.A pattern that still needs minimatch (
*.{txt,md}) does not change: firstglobSync6.6 ms before, 6.7 ms after, over 31 processes.What is left of the first call is cold JavaScript in the port itself. Only a native walker removes it, as the Node v27 row shows.
Why the plain compiler is equivalent. With the options
createMatcher()passes, minimatch does this to a pattern: replace\with/, expand braces, split on/, drop or resolve"",.and..segments, merge runs of**, thenparse()each segment.compilePlainPattern()returnsundefinedwhen any of these would do something: a\,{,[,(or?anywhere,:on Windows (drive letters), an empty,.or..segment, two**in a row, an empty pattern, or more than 65,536 characters (minimatch throws). What is left isparse():**givesGLOBSTAR, a segment with no*gives the string itself (also withnocase, becausecreateMatcher()setsnocaseMagicOnly), and*,*<suffix>,*.*,.*give an object whosetestis the same function minimatch installs (starTest,starDotExtTestor its nocase form,starDotStarTest,dotStarTest). A+,@or!in the suffix goes to minimatch, asstarDotExtREdoes not accept it. The glob code only asks whether a part is a string,**, or hastest(), soisGlobstar()istypeof part === "symbol".The move.
internal/fs/minimatchis the block that was at the bottom ofglob.ts, de-indented. One word of one upstream comment differs: it saidTODO, which the diff lint of this repo rejects in added lines, so it saysTo do. The code is the same, whichgit show --color-movedon the first commit confirms.Tests. The new describe compares the output of
compilePlainPattern()with the output of minimatch for a corpus, and for every pattern of one or two segments from a list of 16 segments. A second list must returnundefined. A child process checks thatfs.globSync("*.txt")andfs.promises.glob("a/**/*.js")do not load minimatch and that*.{txt,js}does. Beyond the suite, a differential run of the old and the new module on 16,500 random cases (random trees with dotfiles and symlinks, plain and minimatch patterns,excludefunction and array,withFileTypes,followSymlinks, othercwd, sync and async) gave the same results in the same order.Self-review. Addressed: the change was one PR with the walk optimizations, now split (the walk is #42963, the move is its own commit). The body now says that this is an interim and names the upstream native implementation. The tables have a Node v27 row. The benchmark is in
bench/glob/. #42870 (a results fix from upstream Node) touches the header comment of the same file, so the second of the two to merge needs a small rebase. Not addressed: a brace pattern such as*.{js,ts}still loads minimatch, because brace expansion and the dedupe pass that follows it would about double the hand-written compiler. The numbers come from a loaded box, which I cannot change, so each number is a median over fresh processes.no test proof · iteration 1 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/node/fs/glob.test.ts