test runner: keep plugin onResolve namespace in cached module records under --isolate - #42679
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… under --isolate Under --isolate the module record comes from the printer's ModuleInfo, not from a parse of the printed source. The runtime linker splits an import that a plugin onResolve answered into path.text and path.namespace, and the printer emits it as "namespace:path". ModuleInfo interned only path.text, so the record requested the bare path and the namespaced onLoad never ran. print_import_record_path and the new ModuleInfo::str_for_import_record now share one predicate, and the three recording sites (import, export from, export star) intern the specifier that the printer emits. The on-disk transpiler cache stores the same record, so its version goes from 32 to 33. An older entry requests the bare path on a cache hit. Fixes #33904 Co-authored-by: Alistair Smith <hi@alistair.sh>
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Status: ready for review. How I reproduced it (1.4.3-canary.1+b99371011, and a debug build of the same commit) Four files from #33904 in one directory: bun test plugin.test.ts # 1 pass
bun test --isolate plugin.test.ts # Expected: "FROM_PLUGIN" Received: "<abs>/data.bar"
bun test --parallel plugin.test.ts # same failureThe debug build stops earlier with With this branch all three commands pass. The new cases in |
WalkthroughChangesThe printer now preserves plugin namespaces in import metadata and printed specifiers. The transpiler cache version increases to invalidate older entries. Isolation tests cover imports, re-exports, redirects, virtual modules, workers, and disk-cache runs. Plugin namespace preservation
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to Restructure the parameterized regression test to the required form before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@test/cli/test/isolation.test.ts`:
- Around line 434-438: Replace the parameterized test.each block with
describe.each, and nest the existing test body inside the parameterized describe
while preserving its cases, arguments, environment values, and assertions.
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src/js_printer/lib.rssrc/jsc/RuntimeTranspilerCache.rstest/cli/test/isolation.test.ts
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LGTM — focused fix that makes the cached module record intern the same namespace:path specifier the printer emits, with the required cache-version bump.
What was reviewed:
- Confirmed
printed_namespace()is the single predicate for bothprint_import_record_pathandstr_for_import_record, and all threeModuleInforecording sites (SImport, export-from clause, import-record loop) now go through it — no remaining baremi.str(record.path.text)on import records. - The
print_import_record_pathrefactor is behavior-preserving: quote/namespace/:/path/quote sequence is unchanged, just with the common quote prints hoisted out of the branch. - Verified
BUN_TEST_PARALLEL_SCALE_MS,BUN_RUNTIME_TRANSPILER_CACHE_PATH, andBUN_DEBUG_ENABLE_RESTORE_FROM_TRANSPILER_CACHEare all read bysrc/;joinandfsare already module-scope imports in the test file;Buffer.allocused for the 5 KiB padding per convention.
Extended reasoning...
Overview
This PR fixes issue #33904: when a runtime Bun.plugin onResolve hook rewrites an import into a non-file namespace, the printer emits "namespace:path" in the source but the cached ModuleInfo record was interning only path.text, so under --isolate/--parallel (which link from cached records) and on transpiler-cache hits, the linker requested a different module than the printed source imported. The fix introduces a single printed_namespace(record) predicate in src/js_printer/lib.rs, uses it from both print_import_record_path and a new ModuleInfo::str_for_import_record, and routes all three module-record producers through the latter. EXPECTED_VERSION in src/jsc/RuntimeTranspilerCache.rs is bumped 32→33 to invalidate on-disk entries carrying the old bare-path record. New tests in test/cli/test/isolation.test.ts cover direct/star imports, three re-export forms, a virtual-namespace specifier, and a no-namespace redirect control, exercised under --isolate, a single reused --parallel worker, and a cold+warm on-disk cache with a file padded past the 4 KiB floor.
Security risks
None. The change is confined to how import specifiers are interned into the internal module-record table and a cache-version constant. No parsing of untrusted input is added, no auth/crypto/permission paths are touched, and no new user-facing surface is introduced. The .concat() allocation in the namespaced branch is bounded by the existing path/namespace strings already held in the import record.
Level of scrutiny
Medium — the JS printer is core, but the change is narrow and mechanical: extract the existing PRINT_NAMESPACE_IN_PATH && !is_file() check into a helper and call it from both sides so they agree by construction. I diffed the refactored print_import_record_path branch structure against the old code and the emitted byte sequence is identical in both arms. I grepped for any remaining mi.str(...path.text) on import records and found none. The common no-namespace path stays zero-alloc (None => self.str(path)). ImportRecord.path is bun_paths::fs::Path<'static> so namespace: &'static [u8] matches the helper's return type. The cache-version bump is exactly what REVIEW.md requires for a change to serialized output.
Other factors
Test coverage is strong and follows harness conventions: tempDir, bunEnv spread, describe.concurrent, Buffer.alloc(n, fill) for padding, output asserted before exitCode, test.each for the mode matrix, and the on-disk cache test asserts exactly one .pile entry after both runs. All three env knobs the tests set are consumed by src/ (runner.rs, RuntimeTranspilerCache.rs, env_var.rs). No CODEOWNERS entries cover the changed paths, the bug-hunt exit was dry_streak with no findings, and there are no outstanding third-party reviews on the timeline. The PR description is thorough about scope (only linker.rs:472 sets the flag; bundler/--compile never do), related PRs (#35605, #40836), and the deliberately-deferred separate concern about caching plugin-rewritten output.
…tions Conflict in src/jsc/RuntimeTranspilerCache.rs: #42679 took cache version 33. This branch keeps 34.
… under --isolate (oven-sh#42679) Fixes oven-sh#33904. Re-lands oven-sh#33905. Same printer change as @alii's 0de84ef on oven-sh#35605, carried alone to land first. ### Problem - A runtime plugin resolves `./data.bar?custom` into namespace `custom`. `bun test --isolate` and `--parallel` never run the namespaced `onLoad`: `Expected: "FROM_PLUGIN" Received: "<abs>/data.bar"`. Debug builds stop with `error: Imports different between parseFromSourceCode and fallbackParse`. - In `src/js_printer/lib.rs`, `print_import_record_path` prints that record as `"custom:/abs/data.bar"`, but the three `ModuleInfo` recording sites (`import`, `export {} from`, `export * from`) interned only `path.text`. The module record asked for `/abs/data.bar`. ### Fix - `printed_namespace()` decides whether a record prints as `namespace:path`. `print_import_record_path` and the new `ModuleInfo::str_for_import_record` both call it. The three recording sites use the latter. - The transpiler cache version goes from 32 to 33. The on-disk cache stores the same record, so an older entry brings the bug back. - Verified: three new cases in `test/cli/test/isolation.test.ts` (`--isolate`, `--parallel`, on-disk cache) fail on 1.4.3-canary. Also ran `test/js/bun/plugin/`. - Self-reviewed: 4 concerns raised, 3 addressed. Not done: keep plugin-rewritten files out of the on-disk cache, an older separate bug (Notes). ### Background - `--isolate` gives each test file a fresh global. Bun builds the JSC module record from `ModuleInfo`, a table the printer fills, with no second parse. - The runtime linker (`src/bundler/linker.rs:462`) runs plugin `onResolve` before the print, stores the answer as `path.text` plus `path.namespace`, and sets `PRINT_NAMESPACE_IN_PATH`. - A source specifier `virt:thing` breaks the same way when namespace `virt` has an `onResolve`. With only an `onLoad` it works. <details><summary>Notes</summary> **Related PRs** - oven-sh#33905 was the first version of this fix. A stale-PR cleanup closed it on 2026-09-13 with no review verdict. - oven-sh#35605 (open, conflicts with main) attaches `ModuleInfo` to every ESM transpile, not only under `--isolate`. With it, this bug reaches plain `bun run`. Its commit 0de84ef makes the same change to the printer (one predicate, the same three sites). This PR does not depend on oven-sh#35605 and does not change when `ModuleInfo` is built. Whichever lands second keeps one helper. - oven-sh#40836 (open) rewrites the same three recording sites for import attributes and still interns `path.text` there. It has to call `str_for_import_record` after a rebase. **Which plugins were affected** - The trigger is the linker rewrite, not the `?query`. The record breaks when the namespaced module cannot be found again from the bare `path.text`. - `./data.bar?custom` with an `onResolve` that strips the query and sets a namespace: broken. This is the issue's case. - `virt:thing` in source with an `onResolve` for namespace `virt`: broken (`Cannot find package 'resolved-other'` in the new test). This is the esbuild-style virtual module pattern. - `./data.bar` with `onResolve({ filter: /\.bar$/ })` into a namespace: worked by accident. The runtime resolve of the bare path matched the same `onResolve` again. - A namespaced specifier with only an `onLoad`: worked. The linker does not rewrite the record, so `path.text` keeps the prefix. - `onResolve` with no namespace (a plain redirect): worked, and still takes the `None` arm of `printed_namespace`. The new test keeps one such import. **Scope of the change** - `request_module` and `request_module_with_phase` have three callers in the printer. All three are changed. The `require()` and `import()` printers also call `print_import_record_path`, but they add nothing to the module record. - Only `src/bundler/linker.rs:472` sets `PRINT_NAMESPACE_IN_PATH`, and only the runtime transpile path (`src/runtime/jsc_hooks.rs`) reaches it with a `ModuleInfo`. The bundler and `bun build --compile` never set the flag. **On-disk transpiler cache** - Stale entry check: ran the issue's repro with a test file above the 4 KiB cache floor and `BUN_RUNTIME_TRANSPILER_CACHE_PATH` set. The `.pile` entry from 1.4.3-canary holds `custom:/abs/data.bar` in the output and `/abs/data.bar` in the ESM record, and the second run fails from the cache. The cache file name is the input hash only, so a fixed build reads that entry unless the version changes. Version 22 was bumped for the same reason. - The third new test runs the fixture cold and warm against a private cache directory, with one module padded past 4 KiB. It covers the record round trip through the cache entry. - Not changed here: the on-disk cache stores output that holds a plugin's link-time `onResolve` answer, under a key made from the importing file's content. If the plugin later answers differently, the old answer is served until the importing file changes. This is independent of `--isolate` and older than this bug. One line after the rewrite in `src/bundler/linker.rs` (`result.runtime_transpiler_cache = None`) would stop it. `parse_entry.rs` already drops the cache in a like case, when it rewrites `@jest/globals` to `bun:test`. The cost is a transpile on every run for each file that a resolve plugin touches, for example every importer of a path alias. That trade needs a maintainer's call, so it is left for a separate PR. **Self-review** 1. The PR body did not name oven-sh#35605 and oven-sh#40836, and said a source-written `custom:foo` was never affected. Fixed above. 2. No test for a namespace that is already in the source. Added the `virt:` imports. 3. The cache version bump was checked by hand only. Added the cold and warm cache test. 4. Keep plugin-rewritten output out of the on-disk cache. Not done, see above. **Tests** - The new cases fail on the unfixed release build with `Cannot find package 'resolved-other'` (first error) and `SyntaxError: Export named 'named' not found in module '<dir>/reexport-clause.ts'`. The same fixture passes there without `--isolate`. - Suites run with the debug build: `test/cli/test/isolation.test.ts` (39 pass), `test/js/bun/plugin/` (48 pass), `test/cli/run/transpiler-cache.test.ts`, `test/regression/issue/30887.test.ts`, `test/js/bun/typescript/type-export.test.ts`, `test/cli/inspect/debugger-buntranspiledmodule.test.ts`. Two cases in the last four (`--drop invalidates cache`, one `--compile` case) hit the 5 s default timeout on the local debug build and pass with a longer timeout. </details> <!-- robobun:evidence:begin --> --- **[human-review]** gate passed · iteration 0 · 3 files touched <details><summary>fails on main (without fix)</summary> ```console ASAN without fix: 3 FAILED $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/cli/test/isolation.test.ts bun test v1.4.3 (b993710) test/cli/test/isolation.test.ts: (pass) bun test --isolate > without --isolate, leaked global is visible to next file [430.63ms] (pass) bun test --isolate > with --isolate, each file gets a fresh global [483.42ms] (pass) bun test --isolate > without --isolate, --preload still runs once (regression) [282.91ms] (pass) bun test --isolate > with --isolate, --preload re-runs in each file's fresh global [448.63ms] (pass) bun test --isolate > with --isolate, module state is not shared between files [379.00ms] (pass) bun test --isolate > with --isolate, a file's process.chdir() is undone before the next file [1257.31ms] (pass) bun test --isolate > with --isolate, a file's process.env writes with native side effects are undone before the next file [1568.05ms] 439 | using dir = tempDir("isolate-plugin-namespace", pluginNamespaceFixture); 440 | const { stderr, exitCode } = await runTests(String(dir), args, ["./a.test.ts", "./b.test.ts"], { 441 | ...bunEnv, 442 | ...en ... (truncated) release without fix: 3 FAILED bun test v1.4.3-canary.1 (b993710) test/cli/test/isolation.test.ts: 439 | using dir = tempDir("isolate-plugin-namespace", pluginNamespaceFixture); 440 | const { stderr, exitCode } = await runTests(String(dir), args, ["./a.test.ts", "./b.test.ts"], { 441 | ...bunEnv, 442 | ...env, 443 | }); 444 | expect(normalizeBunSnapshot(stderr, dir)).toContain("2 pass"); ^ error: expect(received).toContain(expected) Expected to contain: "2 pass" Received: "a.test.ts:\n\n# Unhandled error between tests\n-------------------------------\nerror: Cannot find package 'resolved-other' from '<dir>/a.test.ts'\n-------------------------------\n\n\nb.test.ts:\n\n# Unhandled error between tests\n-------------------------------\nerror: Cannot find package 'resolved-other' from '<dir>/b.test.ts'\n-------------------------------\n\n\n 0 pass\n 2 fail\n 2 errors\nRan 2 tests across 2 files." at <anonymous> (/workspace/bun/test/cli/test/isolation.test.ts:444:47) (pass) bun test --isolate > without --isolate, leaked global is visible to next file [26.77ms] (pass) bun test --isolate > with --isolate, --preloa ... (truncated) ``` </details> <details><summary>passes on PR (with fix)</summary> ```console ASAN with fix: all passed $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/cli/test/isolation.test.ts bun test v1.4.3 (b993710) test/cli/test/isolation.test.ts: (pass) bun test --isolate > with --isolate, each file gets a fresh global [352.05ms] (pass) bun test --isolate > without --isolate, leaked global is visible to next file [439.29ms] (pass) bun test --isolate > without --isolate, --preload still runs once (regression) [297.02ms] (pass) bun test --isolate > with --isolate, --preload re-runs in each file's fresh global [336.20ms] (pass) bun test --isolate > with --isolate, module state is not shared between files [371.07ms] (pass) bun test --isolate > with --isolate, a file's process.env writes with native side effects are undone before the next file [1392.12ms] (pass) bun test --isolate > with --isolate, a file's process.chdir() is undone before the next file [1461.43ms] (pass) bun test --isolate > cached module records keep the namespace a plugin onResolve gives an import (--isolate) [542.79ms] (pass) bun test --isolate > with --isolate, cached module records keep short, Latin-1 and UTF-16 names ... (truncated) release with fix: all passed $ bun scripts/build.ts --profile=release [configured] bun-profile → bun (stripped) target linux-x64-gnu build type Release build dir ./build/release revision 68e0e0b features baseline 23 deps, 131 codegen, 1176 objects in 689ms ninja: Entering directory `/workspace/bun/build/release' [1/1248] install /workspace/bun bun install v1.4.3-canary.1 (b993710) Checked 22 installs across 61 packages (no changes) [7.00ms] [2/1248] gen ErrorCode+*.h [3/1248] install /workspace/bun/packages/bun-error bun install v1.4.3-canary.1 (b993710) Checked 1 install across 2 packages (no changes) [1.00ms] [4/1248] gen bindgenv2 [5/1248] install /workspace/bun/src/node-fallbacks bun install v1.4.3-canary.1 (b993710) Checked 111 installs across 104 packages (no changes) [4.00ms] [6/1248] gen node-fallbacks/react-refresh.js Bundled 1 module in 4ms react-refresh.js 4.81 KB (entry point) [7/1248] fetch zlib [zlib] up to date [8/1248] fetch tinycc [tinycc] up to date [9/1247] fetch libjpeg-turbo [libjpeg-turbo] up to date [10/1247] gen bake.{client,server,error}.js -> bake.client.js, bake.server.js, bake.error.js [11/1247] gen .bind.ts → Gene ... (truncated) ``` </details> <details><summary>diff hotspot</summary> ``` src/js_printer/lib.rs | 51 +++++++++-------- src/jsc/RuntimeTranspilerCache.rs | 5 +- test/cli/test/isolation.test.ts | 116 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 149 insertions(+), 23 deletions(-) ``` </details> **gate history** · 1 passed · 0 rejected · iteration 0 <details><summary>evidence per changed file</summary> ``` file reads edits tests src/js_printer/lib.rs 6 5 23 src/jsc/RuntimeTranspilerCache.rs 2 1 23 test/cli/test/isolation.test.ts 4 3 23 ``` </details> <!-- robobun:evidence:end --> Co-authored-by: Alistair Smith <hi@alistair.sh>
2 participants
Fixes #33904. Re-lands #33905. Same printer change as @alii's 0de84ef on #35605, carried alone to land first.
Problem
./data.bar?custominto namespacecustom.bun test --isolateand--parallelnever run the namespacedonLoad:Expected: "FROM_PLUGIN" Received: "<abs>/data.bar". Debug builds stop witherror: Imports different between parseFromSourceCode and fallbackParse.src/js_printer/lib.rs,print_import_record_pathprints that record as"custom:/abs/data.bar", but the threeModuleInforecording sites (import,export {} from,export * from) interned onlypath.text. The module record asked for/abs/data.bar.Fix
printed_namespace()decides whether a record prints asnamespace:path.print_import_record_pathand the newModuleInfo::str_for_import_recordboth call it. The three recording sites use the latter.test/cli/test/isolation.test.ts(--isolate,--parallel, on-disk cache) fail on 1.4.3-canary. Also rantest/js/bun/plugin/.Background
--isolategives each test file a fresh global. Bun builds the JSC module record fromModuleInfo, a table the printer fills, with no second parse.src/bundler/linker.rs:462) runs pluginonResolvebefore the print, stores the answer aspath.textpluspath.namespace, and setsPRINT_NAMESPACE_IN_PATH.virt:thingbreaks the same way when namespacevirthas anonResolve. With only anonLoadit works.Notes
Related PRs
ModuleInfoto every ESM transpile, not only under--isolate. With it, this bug reaches plainbun run. Its commit 0de84ef makes the same change to the printer (one predicate, the same three sites). This PR does not depend on runtime: attach ModuleInfo to ESM transpiles so TypeScript type-only re-exports resolve #35605 and does not change whenModuleInfois built. Whichever lands second keeps one helper.path.textthere. It has to callstr_for_import_recordafter a rebase.Which plugins were affected
?query. The record breaks when the namespaced module cannot be found again from the barepath.text../data.bar?customwith anonResolvethat strips the query and sets a namespace: broken. This is the issue's case.virt:thingin source with anonResolvefor namespacevirt: broken (Cannot find package 'resolved-other'in the new test). This is the esbuild-style virtual module pattern../data.barwithonResolve({ filter: /\.bar$/ })into a namespace: worked by accident. The runtime resolve of the bare path matched the sameonResolveagain.onLoad: worked. The linker does not rewrite the record, sopath.textkeeps the prefix.onResolvewith no namespace (a plain redirect): worked, and still takes theNonearm ofprinted_namespace. The new test keeps one such import.Scope of the change
request_moduleandrequest_module_with_phasehave three callers in the printer. All three are changed. Therequire()andimport()printers also callprint_import_record_path, but they add nothing to the module record.src/bundler/linker.rs:472setsPRINT_NAMESPACE_IN_PATH, and only the runtime transpile path (src/runtime/jsc_hooks.rs) reaches it with aModuleInfo. The bundler andbun build --compilenever set the flag.On-disk transpiler cache
BUN_RUNTIME_TRANSPILER_CACHE_PATHset. The.pileentry from 1.4.3-canary holdscustom:/abs/data.barin the output and/abs/data.barin the ESM record, and the second run fails from the cache. The cache file name is the input hash only, so a fixed build reads that entry unless the version changes. Version 22 was bumped for the same reason.onResolveanswer, under a key made from the importing file's content. If the plugin later answers differently, the old answer is served until the importing file changes. This is independent of--isolateand older than this bug. One line after the rewrite insrc/bundler/linker.rs(result.runtime_transpiler_cache = None) would stop it.parse_entry.rsalready drops the cache in a like case, when it rewrites@jest/globalstobun:test. The cost is a transpile on every run for each file that a resolve plugin touches, for example every importer of a path alias. That trade needs a maintainer's call, so it is left for a separate PR.Self-review
custom:foowas never affected. Fixed above.virt:imports.Tests
Cannot find package 'resolved-other'(first error) andSyntaxError: Export named 'named' not found in module '<dir>/reexport-clause.ts'. The same fixture passes there without--isolate.test/cli/test/isolation.test.ts(39 pass),test/js/bun/plugin/(48 pass),test/cli/run/transpiler-cache.test.ts,test/regression/issue/30887.test.ts,test/js/bun/typescript/type-export.test.ts,test/cli/inspect/debugger-buntranspiledmodule.test.ts. Two cases in the last four (--drop invalidates cache, one--compilecase) hit the 5 s default timeout on the local debug build and pass with a longer timeout.[human-review] gate passed · iteration 0 · 3 files touched
fails on main (without fix)
passes on PR (with fix)
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