resolver: call the directory iterator on a cache hit, so `bun test` scans every directory by robobun · Pull Request #42921 · oven-sh/bun

robobun · 2026-09-16T12:10:38Z

Problem

bun test <dir> silently skips test files and exits 0 when the resolver already cached a directory of the scan. From pkg/app, bun test ../../ runs 2 of 6 files. No user reported it.
read_directory_with_iterator (src/resolver/lib.rs:1117) returned a cached listing and did not call the iterator. The test scanner finds files only through it.

Fix

On a cache hit the resolver now passes each cached entry to the iterator. The () iterator of every other caller compiles this out.
DirEntry::sorted_entries() moves the sort into the resolver. The scanner loses its root-only fallback walk and has_iterated.
Verified: test/cli/test/bun-test.test.ts (15 scanner cases, 14 fail on 1.4.3-canary). Also 26851.test.ts and the other test/cli/test suites.
Self-reviewed: 16 concerns raised. 5 addressed here. Notes lists the other 11.

Background

The resolver caches one listing (DirEntry) per directory. Startup lists the cwd and its parents. Each scan() adds what it walked.
DirEntryIterator is a per-entry hook of a directory read. Only the scanner uses it.
Considered the walk in the scanner (first version, bun test: list a test file once when two path arguments select it #43361): the resolver still drops the hook. Considered no hook (bun test: sort every scanned directory so test-file order is stable across filesystems #36636): every run pays a sort per directory.

Downsides

Overlapping directory arguments walk shared directories again from the cache. bun test ./ ./pkg on six files: +3 openat, +3 close, +9 allocations, 0 getdents64.
A cached root costs 4 more instructions per entry: +0.27% in Scanner::scan for a cwd of 11,000 files.
Not fixed: case-only name pairs in a cached listing (resolver: keep sibling entries whose names differ only in case #38011), and a file listed twice with its directory (bun test: list a test file once when two path arguments select it #43361).

Notes

Question for a maintainer. The review of #36636 asked: "should the module resolver itself do the sorting? maybe we need a bool that's like "is_unsorted" and then a function to get the sorted dir entries list and then if is_unsorted is true we sort it first?" DirEntry::sorted_entries() is that function without the flag and the stored list. A stored list adds a field of 16 B or more to every cached DirEntry, and one scan reads it once. That was the counter-proposal in #36636, which has no answer yet. This PR keeps the per-entry hook and replays a cached listing through it. The other way is to delete the hook and let the scanner walk sorted_entries() for every directory, which is #36636. Which one do you want? This PR does not need the answer to merge. With it, #36636 rebases to a deletion on top of sorted_entries().

Repro. Six files: top.test.ts, sibling/sibling.test.ts, pkg/pkg.test.ts, pkg/lib/lib.test.ts, pkg/app/app.test.ts, pkg/app/deeper/deeper.test.ts. Test files that run on main 6c1eb067e3 and with this PR:

command	cwd	main	PR
`bun test ../../`, `../..`, the absolute root, `--cwd=<root>/pkg/app ../../`	`pkg/app`	2 of 6	6
bunfig `[test] root = "../../"`	`pkg/app`	2 of 6	6
`bun test ../`, the absolute `<root>/pkg`	`pkg/app`	2 of 4	4
`bun test ../../ ./`	`pkg/app`	2 of 6	6
`bun test ./pkg ./`	root	4 of 6	6
`bun test ./pkg/app ./pkg/lib ./`	root	3 of 6	6
`bun test ./sibling ./`	root	1 of 6	6
`bun test`, `./`, `./ ./pkg`	root	6	6

With a failing pkg/app/app.test.ts, bun test ../../ from pkg/app exits 0 on main and 1 with this PR. The skip is also in 1.4.3-canary (367d939d9). The same fallback was in the Zig scanner, so this is not a regression of the Rust port.

Why a parent root loses a whole subtree. The root is cached, and the old fallback walked it. The child on the path to the cwd is cached too, so the resolver did not call the iterator for it, and the old code had no fallback below the root. The other children of the root are read from disk and scan normally.

What the iterator gets for a cached listing. The entries sorted by lowercased name, one entry per lowercased name. A listing read from disk is visited per dirent in readdir order. Both forms existed before: the cwd root was walked from the cache, its subdirectories from disk. The directories between a parent root and the cwd now take the cached form. They were skipped whole before. The iterator runs with entries_mutex held in both forms.

Measurements. Release builds of main 6c1eb067e3 and of this PR at 03d4fd4564 in one build directory. Debug builds for the gdb counts. The container has no strace, no valgrind and no PMU for perf. The syscall counts come from a small ptrace counter, the instruction counts from a ptrace single-step counter on the main thread, and the allocation counts from gdb breakpoint hit counts.

() read path (read_directory_with_iterator / readdir / add_entry_with_store): 2,266 / 2,574 / 1,893 B on main and on the PR. The objdump -d output of each differs only in addresses.
size_of::<DirEntry>(): 56 B (linux, macos), 64 B (windows), unchanged (temporary const assert, cargo check -p bun_resolver for x86_64-unknown-linux-gnu, aarch64-apple-darwin, x86_64-pc-windows-msvc, aarch64-pc-windows-msvc).
openat/getdents64/close on the six-file tree: bun test 38/18/35 -> 38/18/35. ./ ./pkg 38/18/35 -> 41/18/38. ./ ./ 38/18/35 -> 43/18/40. ./pkg ./ 34/16/31 (4 files) -> 42/18/39 (6 files). ../../ from pkg/app 29/14/26 (2 files) -> 38/18/35 (6 files). getdents64 never exceeds 18: no directory is read from disk twice.
Rust allocator calls between Scanner::scan and take_found_test_files: a single-root tree of 200 directories x 32 files 1,414 vs 1,414. Six-file tree: bun test 22 vs 22, ./ ./pkg 21 vs 30, ./ ./ 21 vs 35.
Scanner::next calls for bun test on the six-file tree: 11 vs 11. The 3 entries of the cached root are now visited with entries_mutex held, like the other 8. A cwd with 1,000 symlinks: 2,009 stat-family syscalls and 1,000 readlink on main and on the PR.
Instructions in Scanner::scan: cwd of 11,000 files 16,277,831 vs 16,321,844 (+0.27%). Six-file tree 33,193 vs 33,262. Repeated runs give the same count.
Release text: 89,178,572 -> 89,178,572 B. Scanner::scan 2,248 -> 1,613 B, read_directory_with_iterator::<ScannerDirIter> 3,891 -> 4,026 B, Scanner::next 1,556 -> 1,575 B, DirEntry::sorted_entries 382 B (size, nm -S).
Scanner block: 25 of 25 pass with the PR build. 14 fail with USE_SYSTEM_BUN=1 (1.4.3-canary). bun test ./top.test.ts ./pkg ./ lists 5 -> 7 entries, one of them the file-argument duplicate that ./top.test.ts ./ already has on main. bun test ./ ./ on a tree with no tests reports 11 -> 22 files searched.
Without the sort in sorted_entries(), the new order case and test/regression/issue/26851.test.ts fail.

Self-review. Verdict: merge after changes. Addressed here (5): the body says that no user reported the skip, and gives the exact text of the #36636 review and what this PR takes from it. Open (5): the review wants one PR to carry this fix. #43361 and the draft #44487 each have a scanner-side copy of the walk, and both conflict with this PR in Scanner.rs and bun-test.test.ts. A rebase of #44487 on this branch is requested. #43361 is unchanged. If it lands first, this PR rebases to delete its walk and iterator_invoked. If this PR lands first, #43361 drops them. Open (6): four notes on wording and docs and two implementation concerns. I do not have their text, because the report was cut short. My own checks of the implementation are the mutation check above, cargo clippy on bun_resolver and bun_runtime, and the source lints in test/internal/source-lints.

Other open PRs on these files.

bun test: list a test file once when two path arguments select it #43361 has the same fix as a walk in Scanner::read_dir_with_name behind an iterator_invoked flag, next to its own change (one entry per file when two arguments select it). bun test: report each path argument that selects no test file and exit 1 #44017 is stacked on it.
bun test: do not follow a directory link back to a directory the scan is already inside #44487 (draft) has a third copy (replay_cached).
bun test: sort every scanned directory so test-file order is stable across filesystems #36636: see the question above.
cli: remove unsafe from bun run / bun test / --filter and the other CLI commands #40242 gives DirEntryIterator::next an fs parameter and rewrites the root-only fallback. Whichever lands second adjusts the one call in the cache-hit arm.
bun test: report directories the scanner cannot read, scan each directory once #41465 and bun test: do not follow a directory link back to a directory the scan is already inside #44487 add a record of the directories already walked. That removes the second walk of overlapping arguments.
resolver: keep sibling entries whose names differ only in case #38011 keeps both of two names that differ only in case in a listing.

Not changed here. Unreadable subdirectories are skipped silently (#41465). --watch does not see a test file that is added later (#42810). Discovery order still differs between a cached listing and a listing read from disk (#36636, #6655).

History. The first version of this PR (through 5572b94383) moved the fallback walk into Scanner::read_dir_with_name and reset has_iterated before each read. Its six tests are kept.

Suites run with the debug build. test/cli/test/bun-test.test.ts, pass-with-no-tests.test.ts, path-ignore-patterns.test.ts, test-changed.test.ts, concurrent-test-glob.test.ts, isolation.test.ts, coverage.test.ts, test-shard.test.ts, test-randomize.test.ts, parallel.test.ts, test/regression/issue/26851.test.ts. The 5 s timeouts in test-shard, test-randomize, parallel and some bun-test cases (deeply nested values, process.on('exit') listeners) also occur on a debug build of main in the same container.

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/test/bun-test.test.ts

The resolver returns a cached directory listing without calling the scanner's iterator. The scanner walked such a listing by hand only for the root of the first scan() call, because has_iterated was never reset. So a second path argument that was already listed (the cwd) was skipped. With a test root that is a parent of the cwd, the whole first-level subtree that holds the cwd was skipped. The run exits 0 with fewer files, or exits 1 with "No tests found!" when the skipped files are the only ones. read_dir_with_name now resets has_iterated before each read and walks the returned listing when the resolver did not call the iterator.

robobun · 2026-09-16T12:10:59Z

Status

Reproduced on 1.4.3-canary.1 (367d939, Linux x64) and on a debug build of main:

mkdir -p r/sibling r/pkg/lib r/pkg/app/deeper && cd r
t() { echo "import { test } from \"bun:test\"; test(\"$1\", () => {});" > "$2"; }
t top top.test.ts; t sibling sibling/sibling.test.ts; t pkg pkg/pkg.test.ts
t lib pkg/lib/lib.test.ts; t app pkg/app/app.test.ts; t deeper pkg/app/deeper/deeper.test.ts
bun test ./pkg ./              # Ran 4 tests across 4 files. Expected 6.
cd pkg/app && bun test ../../  # Ran 2 tests across 2 files. Expected 6.

USE_SYSTEM_BUN=1 bun test test/cli/test/bun-test.test.ts -t "test file discovery" fails 14 of the 15 cases for this fix. bun bd test with this branch passes all 25 tests of the block.

PR: #42921

coderabbitai · 2026-09-16T12:16:28Z

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Walkthrough

The resolver invokes the per-entry callback for cached directory listings in lowercased basename order. CLI tests cover overlapping paths, parent-directory roots, cached-entry ordering, and failing tests below the cwd.

Changes

Cached directory scanning

Layer / File(s)	Summary
Cached entry processing `src/resolver/fs.rs`, `src/resolver/lib.rs`, `src/runtime/cli/test/Scanner.rs`	Added sorted cached-entry retrieval and callback invocation on eligible cache hits. Removed the scanner’s cached-root fallback and iteration state; made `Scanner::next` private.
Scanner discovery tests `test/cli/test/bun-test.test.ts`	Added tests for overlapping paths, parent roots, cached-entry order, and failure reporting for tests below the cwd.

Suggested reviewers: dylan-conway

Priority: ⬆️ High

Merge Risk: ⚪ Minimal · up to ca438

The case-only ordering concern is not reachable because those names share one cache key; no actionable merge-blocking risk remains in the reviewed changes.

Pre-merge checks: 4

Check name	Status	Explanation
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.
Title check		The title clearly identifies the main change: invoking the directory iterator on resolver cache hits so `bun test` discovers all directories.
Description check		The description provides a detailed problem statement, fix, verification results, performance impact, limitations, and related context. It does not use the exact template headings, but it includes the…

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robobun · 2026-09-16T12:19:26Z

^{Updated 5:46 AM PT - Oct 16th, 2026}

❌ @robobun, your commit 93d00f4 has 5 failures in Build #126533 (All Failures):

test/js/web/workers/worker-terminate-lifetime.test.ts - code 1 on 🍎 any x64
test/js/bun/module-graph/module-graph-isolation.test.ts - code 1: } on 🍎 any x64
step failed outside runner - exit 1 on 🍎 any aarch64 - test-bun
test/cli/install/bun-install-windows-rename-retry.test.ts - code 1 on 🪟 11 aarch64
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Unresolved: 2 minor or pre-existing.

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…-scanner-cached-dirs

claude

Code review found no issues

No high-confidence issues detected in this change.

…-scanner-cached-dirs

read_directory_with_iterator returned a cached listing without a call to the iterator. The test scanner finds files only through that iterator, so it skipped every directory the resolver had already listed: the cwd and its parents, and every directory an earlier path argument walked. The cache-hit arm now passes each cached entry to a non-void iterator, sorted by lowercased name through the new DirEntry::sorted_entries(). The `()` iterator compiles the replay out. The scanner loses its root-only fallback walk and has_iterated.

The cached listing reaches the scanner sorted by lowercased name. Without the sort the new case and test/regression/issue/26851.test.ts both fail. Also shorten two comments in the cache-hit arm.

…-scanner-cached-dirs

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Review comments at @test/cli/test/bun-test.test.ts:
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…-scanner-cached-dirs

github-actions Bot added the claude label Sep 16, 2026

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Comment thread test/cli/test/bun-test.test.ts Resolved

claude Bot reviewed Sep 16, 2026

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Comment thread src/runtime/cli/test/Scanner.rs Resolved

Comment thread src/runtime/cli/test/Scanner.rs Resolved

test: use test.each and describe.each for the new scanner cases

ea9eb23

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Comment thread src/runtime/cli/test/Scanner.rs Resolved

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Comment thread src/runtime/cli/test/Scanner.rs Resolved

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Comment thread test/cli/test/bun-test.test.ts Resolved

robobun added 2 commits September 16, 2026 12:35

Scanner: shorten the two comments in read_dir_with_name

0b460a7

Merge remote-tracking branch 'origin/main' into robobun/730a1a7f/test…

5572b94

…-scanner-cached-dirs

claude Bot reviewed Sep 16, 2026

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robobun added 4 commits October 11, 2026 12:35

Merge remote-tracking branch 'origin/main' into robobun/730a1a7f/test…

4eb2ee4

…-scanner-cached-dirs

test: pin the scan order of a directory the resolver already listed

ffb8130

The cached listing reaches the scanner sorted by lowercased name. Without the sort the new case and test/regression/issue/26851.test.ts both fail. Also shorten two comments in the cache-hit arm.

Merge remote-tracking branch 'origin/main' into robobun/730a1a7f/test…

0692d31

…-scanner-cached-dirs

robobun changed the title ~~bun test: scan a directory whose listing the resolver already cached~~ resolver: call the directory iterator on a cache hit, so bun test scans every directory Oct 12, 2026

github-actions Bot reviewed Oct 12, 2026

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Comment thread src/resolver/fs.rs Resolved

coderabbitai Bot reviewed Oct 12, 2026

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Comment thread test/cli/test/bun-test.test.ts Resolved

claude Bot reviewed Oct 12, 2026

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resolver: put the DirEntryIterator doc comment on one line

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claude Bot reviewed Oct 12, 2026

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robobun mentioned this pull request Oct 15, 2026

bun test: do not follow a directory link back to a directory the scan is already inside #44487

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Merge remote-tracking branch 'origin/main' into robobun/730a1a7f/test…

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…-scanner-cached-dirs

robobun mentioned this pull request Oct 17, 2026

bun test: run the files of each scan in path order and shuffle from that order #45790

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robobun mentioned this pull request Nov 8, 2026

resolver: build DirInfo without listing the directory #48148

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