resolver: match file name case the way the directory's filesystem does by robobun · Pull Request #44690 · oven-sh/bun

robobun · 2026-10-07T10:31:23Z

Fixes #44659, fixes #22686

Problem

On a case-sensitive filesystem, import "./fooBar" next to fooBar.ts and FooBar.tsx loads FooBar.tsx (Export named 'value' not found in module .../FooBar.tsx) or fails with ENOENT reading ".../fooBar.tsx". With fooBar.ts and FooBar.ts side by side, only one is reachable.
DirEntry::data (src/resolver/fs.rs) is keyed by lowercased basename. A second name with the same key replaced the first, and DirEntry::get never compared spellings. Six probe sites cached Entry::abs_path from the probed spelling.

Fix

Colliding names all stay in the map: the all-lowercase spelling keeps the lowercased key, the others get their exact name as key.
DirEntry::get returns the entry spelled like the query when one exists. Otherwise a per-directory verdict decides, settled once by lstat of the queried spelling and an inode compare. A case-folding volume still resolves ./File1.js to file1.js. A case-sensitive one does not, like Node.
One helper builds Entry::abs_path from the entry's on-disk name. Not-found errors for a relative specifier name the listed file that differs only in case.
Verified: test/js/bun/resolve/resolve.test.ts (file name case, 14 of 16 fail on the released bun), extra.test.ts, bun-test.test.ts. Self-reviewed: 5 concerns raised, 4 addressed (sealing DirEntry::data behind accessors is a follow-up).

Background

DirEntry is one directory's cached listing. Every resolver probe reads it through DirEntry::get, so get is the one place for the case rule. esbuild flags the same hit as DifferentCase. Bun dropped that flag.
Considered: access() at each probe site (resolver: reject case-mismatched extension probes that do not exist on disk #36054) keeps get wrong and misses the same-extension collision. An Entry chain (resolver: keep sibling entries whose names differ only in case #38011) needs every data.values() walker to follow it.
Revives commit 2900e3c. Supersedes resolver: reject case-mismatched extension probes that do not exist on disk #36054, resolver: keep sibling entries whose names differ only in case #38011 and resolver: ignore differently-cased package.json and tsconfig.json on case-sensitive filesystems #38405.

Downsides

An import spelled in the wrong case on a case-sensitive filesystem used to load. It now fails, as in Node, with a hint that names the file. Projects that relied on this must fix spellings (one in-repo fixture needed it).
A differently spelled hit costs two lstat per directory, once (three on a mount with per-name inodes). Measured probes: 2,000 exact imports, 0. The issue's directory, 1. 50 folded imports in 5 directories, 5.
DirEntry stays 56 bytes, Entry 144. Release bun_resolver rlib text 296117 to 295545 bytes. Instructions not measured (no valgrind or perf here). On a folding volume require.resolve("./File1") now returns file1.js where Node returns File1.js.

Notes

Repro 1 (fooBar.ts + FooBar.tsx): the extension order probes .tsx before .ts, so fooBar.tsx hit the FooBar.tsx entry. From FooBar.tsx itself that entry already had abs_path cached as FooBar.tsx (self-import). From another file load_extension interned the probed fooBar.tsx, which does not exist (ENOENT).
Repro 2 (fooBar.ts + FooBar.ts): put_static_key_hashed overwrote the first entry.
get_comptime_query and has_comptime_query share the rule, so dir_info_uncached's Package.json / Tsconfig.json probes are fixed too (the Cannot read file ".../": ENOENT case from resolver: ignore differently-cased package.json and tsconfig.json on case-sensitive filesystems #38405).
A collision at insert time also records the verdict Exact for that directory, so no probe runs there. Windows is always Folds by cfg.
The verdict is Unknown, Exact or Folds. The probe stats the listed file first. If it is gone, the listing is stale and the verdict stays Unknown, so a folding directory is never pinned as Exact from stale data. Then it stats the queried spelling: ENOENT is Exact. Both present with one inode is Folds. Both present with different inodes is either a stale listing on a case-sensitive filesystem or a folding mount that gives every name its own inode (cifs noserverino, FUSE without use_ino). A third spelling of the name that the listing does not hold tells them apart: only the folding mount opens it. So Folds is proven by the filesystem, never inferred from metadata. A transient error leaves Unknown. Every in-place re-read carries the verdict over and recycles an Entry only for its exact name, so a case-only rename gets a fresh entry.
tsc resolves ./fooBar to fooBar.ts on the issue's tree on every platform because it tries .ts before .tsx. Bun tries .tsx first, so on default macOS/Windows the issue's two-file repro still self-imports: fooBar.tsx really does open FooBar.tsx there.
The hint (case_near_miss in src/resolver/lib.rs) runs only on the error path. It reads the cached listing of the target directory under entries_mutex, tries the basename and then nine source extensions, and returns nothing unless that directory's verdict is Exact. The Node-shaped .message carries the same hint.
Not changed: DirEntryDirIter (bun run --filter glob walk) still yields map keys, see bun run --filter: use original-case basename for workspace dirs #29941. No esbuild-style "use X instead of Y" warning on a folded hit. DirEntry::data is still pub, so DotEnv and the glob walker read keys without pick_case.
resolver: publish Entry.abs_path through the per-entry mutex #40258 (merged) publishes Entry::abs_path through the per-entry mutex. Resolver::entry_abs_path fills through its abs_path_or_try_fill, so the six sites share one writer and one lock.
resolver: reject case-mismatched extension probes that do not exist on disk #36054, resolver: keep sibling entries whose names differ only in case #38011 and resolver: ignore differently-cased package.json and tsconfig.json on case-sensitive filesystems #38405 are earlier attempts at parts of this. Their unique tests are ported here. They remain open for a maintainer to close.
The exact-key spill never collides with a lowercased key: a spilled name is never all-lowercase.
Bufs::index was only used by one of the removed abs_path writers and is gone.
The fixture test/js/web/timers/setinterval-cancel-fixture.js was imported as setInterval-cancel-fixture.js. It only loaded on Linux because of the case folding this PR removes, so it is renamed to match the import.
Probe counts come from the BUN_DEBUG_Fs log line in pick_case. Sizes from -Zprint-type-sizes and size on cargo build -p bun_resolver --release of main and this branch.
Other suites run: bundler_npm.test.ts, esbuild/packagejson.test.ts, esbuild/tsconfig.test.ts, esbuild/importstar.test.ts, import-meta.test.js, esModule.test.ts, tsconfig-paths.test.ts, bun-main-entry-point.test.ts, run-cjs-esm.test.ts, filter-workspace.test.ts, env.test.ts, bun-test.test.ts.

no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/bun/resolve/resolve.test.ts, test/cli/test/bun-test.test.ts

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Inline comments:
Review comments at @src/jsc/ResolveMessage.rs:
- Around line 192-200: Update node_message() to preserve the case-mismatch hint
appended by fmt when constructing Node-shaped module-not-found messages, so
get_message, get_stack, and to_string_fn include it.

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src/bundler/bundle_v2.rs
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src/jsc/ResolveMessage.rs
src/resolver/fs.rs
src/resolver/lib.rs
src/resolver/package_json.rs
src/resolver/resolver.rs
src/runtime/cli/test/Scanner.rs
test/bundler/esbuild/extra.test.ts
test/cli/test/bun-test.test.ts
test/harness.ts
test/js/bun/resolve/resolve.test.ts
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claude

Beyond the inline finding, I re-checked the resolver paths raised on the previous revision against the new commits in src/resolver/fs.rs and src/resolver/lib.rs: probe_case_verdict now lstat's the listed name first and returns Unknown when it is gone, so a stale listing cannot pin a folding directory as Exact; the distinct-inode branch probes an unlisted third spelling instead of a size/mode/mtime heuristic, which covers cifs noserverino without misreading a cp -p sibling as the same file; and case_near_miss rejects a non-absolute source_dir and uses join_abs_string_buf_checked, so the Windows debug assert and POSIX overrun are not reachable. I also walked the three-way collision orders in add_entry (Foo/FOO/foo in any order) and the all-lowercase spelling ends up owning the lowercased key with the others on exact keys in each case.

Extended reasoning...

Since the last review the PR gained eight commits that rework the case-verdict probe (listed-name lstat first, inode compare, third-spelling probe), guard case_near_miss on absolute input, and add the isCaseSensitiveFS harness helper; the remaining inline finding is the bare rmSync reference in test/harness.ts. The ruled-out items above come from reading the new fs.rs and lib.rs code directly.

claude

Code review found no issues

No high-confidence issues detected in this change.

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Inline comments:
Review comments at @src/jsc/ResolveMessage.rs:
- Around line 374-385: Update hint extraction in node_message to inspect only
the known suffix boundary after the quoted specifier and referrer; include the
referrer length when present, and retain the hint only if that suffix starts
with CASE_HINT_PREFIX. Do not search the full message, where text inside the
specifier could be mistaken for the appended hint.

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The directory listing cache keys entries by ASCII-lowercased basename. Two names that differ only in case collided, so the later readdir entry replaced the earlier one, and a lookup returned whichever entry held the key without comparing its spelling to the query. On a case-sensitive filesystem an extensionless import of ./fooBar next to FooBar.tsx loaded FooBar.tsx (a self-import) or failed with ENOENT on a fooBar.tsx path built from the probed spelling, and only one of fooBar.ts and FooBar.ts was reachable. Colliding names now all stay in the map: the all-lowercase spelling keeps the lowercased key and the others are keyed by their exact name. A collision also settles that the directory's filesystem distinguishes case. DirEntry::get (and the comptime probes) return the entry spelled exactly like the query when there is one. Otherwise the directory's verdict decides: it is probed once per directory with lstat of the queried spelling and compared by inode with the listed file, so a case-folding volume keeps resolving ./File1.js to file1.js and a case-sensitive one does not. Windows is always treated as folding. Every resolver probe now caches Entry::abs_path through one helper that joins the entry's directory and on-disk name, so the cached path always opens regardless of which spelling reached the entry first. Stale-listing refreshes recycle an Entry only for its exact name and carry the settled verdict over.

On a case-sensitive filesystem the resolver no longer folds case, so the fixture must be named as the test spells it.

…ibling tests A "Cannot find module" or "Could not resolve" error for a relative specifier now says which on-disk name differs from it only in case, so a project that relied on case folding sees the fix instead of a bare miss. The probe reads the cached listing and runs only on the error path. The test scanner orders siblings that differ only in case by their exact name so discovery stays deterministic. The package.json read error names the package.json path instead of its directory. Tests cover the index, js-to-ts rewrite and exports wildcard probes, a rewrite reached through a trailing slash, bun test discovery of a.test.ts next to A.test.ts, and the new hint.

…exists The probe now stats the listed file first. A listing whose file is gone proves nothing, so the verdict stays unknown instead of marking a case-folding directory as case-sensitive for the rest of the process. Two names that both exist count as one file when their inode or their metadata match, because some folding mounts give every name its own inode. The verdict carries over at every in-place re-read, not only the one in read_directory. The not-found hint requires an absolute referrer directory and uses the checked join.

…etadata When the queried spelling and the listed file exist under different inodes, the probe now stats a third spelling of the name that the listing does not hold. Only a case-folding mount opens it. Two distinct files with equal size and mtime no longer pass as one file.

The harness helper used a bare rmSync that the rebase left without an import. node_message() rebuilt the text without the hint fmt appended, so .message lost it.

… rebase

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Nothing new to post: everything this review found is already covered by existing comments on this pull request or didn't merit a separate one.

robobun · 2026-10-26T19:27:23Z

#38405 fixed only the fixed-name probes (package.json, tsconfig.json, jsconfig.json). I closed it in favor of this PR.

Check: I built this branch at 44be24c and ran the test block of #38405 against it on Linux (ext4), unchanged. 8 tests pass. The ninth used a dangling package.json symlink to reach the Cannot read file message. Since #44968 a dangling symlink counts as a missing entry, so that test no longer applies on main.

These cases from #38405 are not in the tests here yet. They are in 2759cb4, test/js/bun/resolve/resolve.test.ts, describe differently-cased package.json / tsconfig.json in a directory:

Jsconfig.json next to the entry point.
bun build next to a Package.json.
Path aliases from a lone Tsconfig.json or Jsconfig.json: not applied on a case-sensitive filesystem, applied on a case-insensitive one (this half was not run here, it needs macOS or Windows).
The lowercase tsconfig.json / jsconfig.json wins over a differently cased sibling with other contents.

One difference, from reading the code and not from a run: probe_case_verdict is always Folds on Windows. A directory with the per-directory case-sensitive flag (fsutil file setCaseSensitiveInfo) that holds only Package.json still matches package.json there, and the open that follows fails. #38405 asked the filesystem on Windows too.

robobun · 2026-10-26T19:55:48Z

#36054 fixed only the extension probes. It called access() at each probe site: extension, index, js-to-ts rewrite and exports wildcard. This PR covers it. #36054 stays open for a maintainer to close.

Check: I built this branch at 44be24c on Linux (ext4) and ran the test file of #36054 against it, unchanged. 11 tests pass, 1 is skipped, 1 fails. The skipped test needs a case-insensitive filesystem. The failing test has an exact exports target spelled in a different case than the file: ".": "./dist/foo.js" next to dist/Foo.js. #36054 resolved it on every filesystem. This PR reports it as not found on a case-sensitive filesystem. Node v26.3.0 gives MODULE_NOT_FOUND for the same tree.

These cases from #36054 are not in the tests here yet. They are in 2292ea3, test/js/bun/resolve/resolve-case-mismatched-extension-probe.test.ts:

The case-insensitive half of the five probe-site rows and of the lone Todos.tsx case. There the higher-priority extension wins, and Bun.resolveSync returns the on-disk spelling. The sites table here runs only on a case-sensitive filesystem. The lone-file test here checks that the file loads, not its path. This half was not run here. It needs macOS or Windows.
The exact exports target above. No test here has that case. It needs the result of this PR, not the one resolver: reject case-mismatched extension probes that do not exist on disk #36054 expected.

The Windows difference noted in #44690 (comment) applies to #36054 too, again from reading the code and not from a run. #36054 called GetFileAttributesW for the probed spelling. In a directory with the per-directory case-sensitive flag that holds todos.ts and Todos.tsx, it resolves ./todos to todos.ts. This PR resolves it to Todos.tsx there.

robobun · 2026-10-26T20:01:05Z

#38011 covered one part of this PR: two names in one directory that differ only in case (mod.mjs next to Mod.mjs). It chained the colliding entries, and a lone file still matched any spelling. This PR covers that part. #38011 is still open, for a maintainer to close.

Check: I built this branch at 44be24c on Linux (ext4) and ran the test block of #38011 against it. The block is unchanged. Only the harness helper has a different name here. 5 tests pass, 5 fail. The 5 that fail expect the result of #38011. There a lone file matches any spelling, and the not-found message has no hint. With those expectations changed to the result of this PR, all 10 pass. The scanner test that this PR took from #38011 passes too.

These cases from #38011 are not in the tests here yet. They are in 53dbfe4, test/js/bun/resolve/resolve.test.ts, describe sibling files whose names differ only in case:

A directory that changes between two in-process Bun.build calls, so the second build reads it again. One test adds a third spelling. One deletes one of two siblings, in both orders. One renames a lone file in case only. No test in this PR changes a directory after the first read. These tests need the result of this PR, not the one resolver: keep sibling entries whose names differ only in case #38011 expected.
lib/ and Lib/ below a symlinked directory resolve to their own real paths. This test passes unchanged.

The block below has these five tests with the expectations of this PR. It needs renameSync and unlinkSync in the fs import and basename in the path import. On this branch all five pass, alone and in the full file. On main at 367d939 all five fail. The rename test has a branch for a case-insensitive filesystem, where the old spelling still resolves to the renamed file. That branch was not run here. It needs macOS or Windows.

The five tests

// From #38011. A later `Bun.build` in one process runs at a higher resolver
// generation and re-reads the directories that an earlier build cached. The
// re-read recycles an entry only for its exact name, and a sibling that
// differs only in case keeps its own entry.
describe("file name case across directory re-reads", () => {
  const caseSensitiveFS = isCaseSensitiveFS();
  const hint = (spelling: string) => `. Did you mean "${spelling}"? File names are case-sensitive on this filesystem`;

  // The on-disk spelling of every module bundled for `entry` (`bun build`
  // prints a `// <path>` line above each module), or the build errors.
  async function bundledModules(dir: string, entry: string): Promise<string[]> {
    const result = await Bun.build({ entrypoints: [join(dir, entry)], throw: false });
    if (!result.success) return result.logs.map(log => log.message);
    const bundle = await result.outputs[0].text();
    return Array.from(bundle.matchAll(/^\/\/ (.+)$/gm), match => basename(match[1])).filter(name => name !== entry);
  }

  // The bundle thread bumps the generation once its queue has drained, which
  // can be after the previous build's promise resolved. Each attempt is a
  // build, so a later attempt re-reads. The tests are serial so that no other
  // test keeps the queue from draining.
  async function expectBundledModulesAfterChange(dir: string, entry: string, expected: string[]) {
    let actual = await bundledModules(dir, entry);
    for (let attempt = 0; attempt < 50 && !Bun.deepEquals(actual, expected); attempt++) {
      actual = await bundledModules(dir, entry);
    }
    expect(actual).toEqual(expected);
  }

  describe.skipIf(!caseSensitiveFS)("siblings differing only in case", () => {
    it.serial("tracks added and removed variants", async () => {
      using dir = tempDir("resolve-case-reread", {
        "mod.mjs": `console.log("lower");`,
        "Mod.mjs": `console.log("UPPER");`,
        "two.mjs": `
          import "./mod.mjs";
          import "./Mod.mjs";
        `,
        "three.mjs": `
          import "./mod.mjs";
          import "./Mod.mjs";
          import "./MOD.mjs";
        `,
        "lower-shout.mjs": `
          import "./mod.mjs";
          import "./MOD.mjs";
        `,
        "upper.mjs": `import "./Mod.mjs";`,
      });

      expect(await bundledModules(String(dir), "two.mjs")).toEqual(["mod.mjs", "Mod.mjs"]);

      writeFileSync(join(String(dir), "MOD.mjs"), `console.log("SHOUT");`);
      await expectBundledModulesAfterChange(String(dir), "three.mjs", ["mod.mjs", "Mod.mjs", "MOD.mjs"]);

      unlinkSync(join(String(dir), "Mod.mjs"));
      await expectBundledModulesAfterChange(String(dir), "lower-shout.mjs", ["mod.mjs", "MOD.mjs"]);
      await expectBundledModulesAfterChange(String(dir), "upper.mjs", [
        'Could not resolve: "./Mod.mjs"' + hint("./mod.mjs"),
      ]);
    });

    // Both orders, because the filesystem decides which of the two files
    // readdir lists first. The directory stays case-sensitive after the
    // delete, so the survivor answers to its own spelling only.
    it.serial.each([
      ["mod.mjs", "Mod.mjs"],
      ["Mod.mjs", "mod.mjs"],
    ])("deleting %s leaves %s reachable by its own spelling only", async (removed, kept) => {
      using dir = tempDir("resolve-case-shrink", {
        "mod.mjs": `console.log("lower");`,
        "Mod.mjs": `console.log("UPPER");`,
        "both.mjs": `
          import "./mod.mjs";
          import "./Mod.mjs";
        `,
        "shout.mjs": `import "./MOD.mjs";`,
        "removed.mjs": `import "./${removed}";`,
        "kept.mjs": `import "./${kept}";`,
      });

      expect(await bundledModules(String(dir), "both.mjs")).toEqual(["mod.mjs", "Mod.mjs"]);
      expect(await bundledModules(String(dir), "shout.mjs")).toEqual([
        'Could not resolve: "./MOD.mjs"' + hint("./mod.mjs"),
      ]);

      unlinkSync(join(String(dir), removed));
      await expectBundledModulesAfterChange(String(dir), "removed.mjs", [
        `Could not resolve: "./${removed}"` + hint(`./${kept}`),
      ]);
      await expectBundledModulesAfterChange(String(dir), "shout.mjs", [
        'Could not resolve: "./MOD.mjs"' + hint(`./${kept}`),
      ]);
      await expectBundledModulesAfterChange(String(dir), "kept.mjs", [kept]);
    });

    // The real path of a directory below a symlink is cached on the parent
    // listing's entry for it, so `lib` and `Lib` must not share one entry.
    it.concurrent("directories reached through a symlink each resolve to their own real path", async () => {
      using dir = tempDir("resolve-case-dirs", {
        "real/lib/x.mjs": `export const who = "lower";`,
        "real/Lib/x.mjs": `export const who = "UPPER";`,
        "entry.mjs": `
          import { who as lower } from "./link/lib/x.mjs";
          import { who as upper } from "./link/Lib/x.mjs";
          console.log(
            JSON.stringify({
              lower,
              upper,
              resolved: [
                Bun.resolveSync("./link/lib/x.mjs", import.meta.dir),
                Bun.resolveSync("./link/Lib/x.mjs", import.meta.dir),
              ],
            }),
          );
        `,
      });
      symlinkSync("real", join(String(dir), "link"), "dir");
      const result = await bunRun(join(String(dir), "entry.mjs"));
      expect(result).toSpawn();
      expect(JSON.parse(result.stdout)).toEqual({
        lower: "lower",
        upper: "UPPER",
        resolved: [join(String(dir), "real", "lib", "x.mjs"), join(String(dir), "real", "Lib", "x.mjs")],
      });
    });
  });

  // A case-only rename is legal on a case-insensitive filesystem too. The
  // renamed file gets a fresh entry with the new spelling. The old spelling
  // still opens the file only where the filesystem folds case.
  it.serial("picks up a case-only rename", async () => {
    using dir = tempDir("resolve-case-rename", {
      "x.mjs": `console.log("x");`,
      "before.mjs": `import "./x.mjs";`,
      "exact.mjs": `import "./X.mjs";`,
      "old-spelling.mjs": `import "./x.mjs";`,
    });

    expect(await bundledModules(String(dir), "before.mjs")).toEqual(["x.mjs"]);

    renameSync(join(String(dir), "x.mjs"), join(String(dir), "X.mjs"));
    await expectBundledModulesAfterChange(String(dir), "exact.mjs", ["X.mjs"]);
    await expectBundledModulesAfterChange(
      String(dir),
      "old-spelling.mjs",
      caseSensitiveFS ? ['Could not resolve: "./x.mjs"' + hint("./X.mjs")] : ["X.mjs"],
    );
  });
});

robobun assigned Jarred-Sumner Oct 7, 2026

github-actions Bot added the claude label Oct 7, 2026

robobun mentioned this pull request Oct 7, 2026

Extensionless import resolves to a file whose name differs only in case (fooBar.ts vs FooBar.tsx) on a case-sensitive file system #44659

Open