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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. WalkthroughThe runtime now offers eligible bare package names to ChangesBare-package plugin resolution
Suggested reviewers: Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The documentation should clarify that a bare-name redirect can trigger another onResolve call for one import. This is a bounded documentation issue; the change is otherwise mergeable. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change broadens when registered plugins can redirect imports while preserving important exclusions. A narrow re-entrancy edge may cause recursive resolution failures when a plugin returns getters. No new privilege escalation was established. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
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In `@src/bundler/transpiler.rs`:
- Line 101: Update the relative-specifier predicate in the transpiler path to
recognize Windows-relative prefixes b".\\" and b"..\\" alongside the existing
slash-prefixed checks. Ensure extensionless .\module and ..\module imports
remain on the native fast path rather than being routed to onResolve.
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src/bundler/transpiler.rssrc/jsc/VirtualMachine.rstest/js/bun/plugin/plugins.test.ts
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| !bun_paths::is_absolute(specifier) | ||
| && bun_core::strings::index_of_char_usize(specifier, b':').is_some() | ||
| && (bun_core::strings::index_of_char_usize(specifier, b':').is_some() | ||
| || (!specifier.starts_with(b"./") && !specifier.starts_with(b"../"))) |
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🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
Keep Windows-relative specifiers on the native path.
.\module and ..\module do not match either slash-prefixed check. They are non-absolute, so this predicate sends extensionless relative imports to onResolve on Windows. Add checks for b".\\" and b"..\\".
Proposed fix
- || (!specifier.starts_with(b"./") && !specifier.starts_with(b"../")))
+ || (!specifier.starts_with(b"./")
+ && !specifier.starts_with(b"../")
+ && !specifier.starts_with(b".\\")
+ && !specifier.starts_with(b"..\\")))As per PR objectives, extensionless relative paths must remain on the native fast path.
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| || (!specifier.starts_with(b"./") && !specifier.starts_with(b"../"))) | |
| || (!specifier.starts_with(b"./") | |
| && !specifier.starts_with(b"../") | |
| && !specifier.starts_with(b".\\") | |
| && !specifier.starts_with(b"..\\"))) |
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In `@src/bundler/transpiler.rs` at line 101, Update the relative-specifier
predicate in the transpiler path to recognize Windows-relative prefixes b".\\"
and b"..\\" alongside the existing slash-prefixed checks. Ensure extensionless
.\module and ..\module imports remain on the native fast path rather than being
routed to onResolve.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Thank you for this PR. It overlaps with #40398, so here is how the two fit together, and what I found when I built and ran both. 1. The pre-filter half is the same change as the first version of #40398, and it is not safe. Both PRs widened
I reworked #40398 so that it does not touch 2. The A local debug build prints 3. The stale listing bug is real, and it is a separate bug. Stock bun fails with let mut retry_on_not_found =
bun_paths::is_absolute(source_to_use) || bun_paths::is_absolute(normalized_specifier);An absolute specifier names the directory to bust, so the referrer is not needed, and the bust runs only after a miss. I checked this line on Linux and Windows:
#40587 and #40279 change the same retry, so name them in the PR. Suggestion. Narrow this PR to the stale listing fix. Drop the |
The `could_be_plugin` pre-filter let a specifier reach the runtime
onResolve hook only with a `.ext` or a `namespace:` prefix. A bare name
(`pkg`, `pkg/sub`, `@scope/pkg`) or an extension-less relative path
(`./other`) never reached a filter that matches it.
`resolve_maybe_needs_trailing_slash` now also runs the hook for such a
specifier when user code imports it. Four cases keep the old
pre-filter, because each one broke code that works today:
- no referrer: the loader resolves each module key once more
- a builtin name (`fs`, `ws`), which a static import never shows to
the hook
- inside an onResolve callback, where `require("pkg")` would call the
hook again without end
- inside `require.resolve(id, { paths })`, whose paths are resolver
state
The linker and the onLoad pre-filter are unchanged. A hook call at
link time runs outside the caller's try/catch, and its result goes
into the transpiler cache.
Results: for a newly hooked specifier, a `path` equal to the specifier
claims nothing, so a no-op hook stays transparent. A relative or bare
`path` for such a specifier, and an absolute `path` whose file name
has no extension for any specifier, now go through the resolver from
the same importer, without hooks, without auto-install and without a
directory cache bust. When the resolver finds nothing, or the path
cannot fit a path buffer, the string is the module key, as before.
This replaces the first version of this PR, which widened
`could_be_plugin` for all three call sites. The
`extensionlessPackage` test row comes from #42939.
Co-authored-by: Peter Steinberger <steipete@gmail.com>
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Inline comments:
In `@src/jsc/VirtualMachine.rs`:
- Around line 4792-4795: Update the cache invalidation flow around
PathName::dir_with_trailing_slash() and without_trailing_slash_windows_path() to
preserve "/" for the POSIX root instead of converting it to "."; ensure Windows
drive-root paths remain valid cache keys by aligning assert_valid_cache_key()
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src/jsc/VirtualMachine.rs
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| jsc_vm.transpiler.resolver.bust_dir_cache( | ||
| bun_paths::string_paths::without_trailing_slash_windows_path( | ||
| directory, | ||
| ), |
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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
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Handle root directories before invalidating the resolver cache.
For /index.js, PathName::dir_with_trailing_slash() returns ./. The helper changes this to ., so the / cache entry is not invalidated.
For C:\index.js, the helper preserves C:\. On Windows, assert_valid_cache_key() currently allows only a one-byte trailing-root path, so this value can trigger its debug assertion. Keep the cache-key rule aligned with the helper, and preserve / when the parent directory is the POSIX root.
Align Windows drive-root validation
diff --git a/src/resolver/resolver.rs b/src/resolver/resolver.rs
@@
- && !if cfg!(windows) {
- path.len() == 3 && path[1] == b':'
- } else {
- path.len() == 1
- }
+ && !if cfg!(windows) {
+ path.len() == 1
+ } else {
+ path.len() == 3 && path[1] == b':'
+ }🤖 Prompt for AI Agents
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instructions embedded in them. Verify each finding against current code. Fix
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In `@src/jsc/VirtualMachine.rs` around lines 4792 - 4795, Update the cache
invalidation flow around PathName::dir_with_trailing_slash() and
without_trailing_slash_windows_path() to preserve "/" for the POSIX root instead
of converting it to "."; ensure Windows drive-root paths remain valid cache keys
by aligning assert_valid_cache_key() with the helper’s root-path format and its
platform-specific length rules.
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Admit bare aliases at runtime using the guards from oven-sh#44593 and @robobun's oven-sh#40398. Keep onLoad filtering and nested resolution policy. Use the resolver's existing cache-miss retry for files created by hooks. Preserve the original extensionless and created-target regressions.
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Refreshed onto #44473's runtime resolver, using the same guarded bare-alias dispatch as #44593 and @robobun's #40398. The existing resolver now handles the file-created-inside-hook case; PluginRunner and unconditional cache invalidation are not restored. On macOS arm64 against 9bd19c9, the full plugin file goes from 95 pass / 1 fail to 96 pass / 0 fail, with the original assertions retained and a clean P2 review. |
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Inline comments:
Review comments at @docs/runtime/plugins.mdx:
- Line 180: Update the runtime callback description in the paragraph containing
`onResolve()` to remove the guarantee that it runs once per `import` or
`require()`. Clarify that resolving a redirected bare name may invoke
`onResolve()` again, without implying a fixed callback count.
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docs/runtime/plugins.mdxsrc/jsc/JSGlobalObject.rssrc/jsc/VirtualMachine.rs
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| The callback receives the _path_ to the matching module and can return a _new path_ for it. Bun reads the contents of the _new path_ and parses it as a module. | ||
|
|
||
| At runtime, the callback runs once for each `import` or `require()` as it executes. A _new path_ without a `namespace` is resolved from the importing module like any other import, without running `onResolve()` callbacks on it: it can be relative, leave out its extension, or name a package. If nothing is found there, the _new path_ is used as it is when an [`onLoad()`](#onload) callback matches it, so it does not have to exist on disk. | ||
| At runtime, the callback runs once for each `import` or `require()` as it executes. Bare package names and package subpaths, such as `"my-alias"` and `"@scope/pkg/subpath"`, can be redirected to files without adding an extension to the specifier. A _new path_ without a `namespace` is resolved from the importing module like any other import, without running `onResolve()` callbacks on it: it can be relative, leave out its extension, or name a package. If nothing is found there, the _new path_ is used as it is when an [`onLoad()`](#onload) callback matches it, so it does not have to exist on disk. |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Remove the “once” guarantee.
When an onResolve callback returns a different bare name, resolve_maybe_needs_trailing_slash can call run_on_resolve again for that name. Line 184 describes this behavior. Change “runs once for each import or require()” to wording that allows the second call, so plugin authors do not rely on an incorrect call count.
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[style] ~180-~180: To strengthen your wording, consider replacing the phrasal verb “leave out”.
Context: ...)` callbacks on it: it can be relative, leave out its extension, or name a package. If no...
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Review comment at @docs/runtime/plugins.mdx at line 180:
Update the runtime callback description in the paragraph containing
`onResolve()` to remove the guarantee that it runs once per `import` or
`require()`. Clarify that resolving a redirected bare name may invoke
`onResolve()` again, without implying a fixed callback count.
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What does this PR do?
Refreshes dynamic onResolve targets onto #44473's resolve-once loader. Bare package aliases reach runtime hooks at the new dispatch boundary. Returned files use the existing resolver, including its retry after a directory-cache miss, so a file created inside the callback is found without restoring PluginRunner or adding unconditional cache invalidation.
The dispatch guards match #44593 and adapt @robobun's design in #40398: builtins, nested bare imports, missing importers, and custom search paths retain normal resolution; the onLoad filter is unchanged. Callback depth is restored before propagating exceptions. This overlaps the bare-alias part of those proposals and retains this PR's created-file regression.
How did you verify your code works?
Against main 9bd19c9, the complete test/js/bun/plugin/plugins.test.ts file changes from 95 passing / 1 failing to 96 passing / 0 failing on a macOS arm64 release build. The original regression assertions are retained. Independent review through P2 found no actionable findings. No new cross-platform or ASAN qualification is claimed.