Do not auto-install a bare name that is a runtime plugin's own - #44492
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 0 remain after this review. WalkthroughRuntime plugin resolution now receives an explicit global-cache policy. Documentation clarifies how plugin-returned paths are resolved and that they are not auto-installed. Concurrent tests check import and resolution behavior and package registry requests. ChangesRuntime plugin resolution
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Beyond the inline findings, I also checked that threading global_cache through resolve_without_on_resolve into _resolve is behavior-preserving on the no-plugin path: _resolve has exactly one caller, and global.bun_vm().transpiler.resolver.opts.global_cache is the same VM and field _resolve previously read itself. I also looked at the plugin-answer path resolving twice (resolve_virtual_module, then the resolver) and the fake registry's asked list in the new tests for flakiness; neither looked like a defect in this diff.
Extended reasoning...
The change touches the runtime module resolver in src/jsc/VirtualMachine.rs (the plugin onResolve follow-up resolution now runs with GlobalCache::disable, and the global_cache mode becomes an explicit parameter), plus docs, bun.d.ts JSDoc, and a new plugin test block with an in-process fake registry. It touches no auth, crypto, or injection surface, but it changes which packages a plugin's bare-name answer can reach, which is a user-visible behavior decision that the inline findings flag and that a maintainer should weigh.
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Code review found no issues
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Still open from earlier reviews (1):
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src/jsc/VirtualMachine.rs:5236—Users running without a node_modules directory whose plugin's onResolve redirects to a real package now get Cannot find…
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dylan-conway
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/jsc/VirtualMachine.rs:
- Around line 5229-5245: Always set GlobalCache::disable for the plugin answer
passed to resolve_without_on_resolve, rather than inheriting the resolver’s
configured cache when there is no onLoad handler; redirected answers must not
trigger automatic package installation.
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docs/runtime/plugins.mdxpackages/bun-types/bun.d.tssrc/jsc/VirtualMachine.rstest/js/bun/plugin/plugins.test.ts
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Beyond the inline findings, I also checked the global_cache parameter refactor: both callers of resolve_without_on_resolve are updated, the non-plugin fallback at src/jsc/VirtualMachine.rs:5261 passes the same opts.global_cache value _resolve used to read internally, and _resolve consumes it only at the single resolve_and_auto_install site, so that path is behavior-preserving. The new test block is hermetic (loopback registry via Bun.serve({ port: 0 }), using cleanup, concurrent pipe drain) and now covers all eight resolve entry points.
Extended reasoning...
The change makes the runtime resolver skip auto-install for a bare name a plugin's onResolve answers, threading a global_cache parameter through _resolve and resolve_without_on_resolve, and adds a describe.concurrent test matrix with a local registry stub. The refactor part and the test harness were examined and ruled out as problems; the remaining concerns are the three inline findings on the new decision logic at lines 5231-5238.
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… what it says that is not valid
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Updated 8:03 PM PT - Oct 2nd, 2026
⏳ @dylan-conway, your commit 669380c is still building in |
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What does this PR do?
Fixes a regression from #44473, which is in no release.
In a project with no
node_modulesdirectory, Bun auto-installs a package it does not find. Since #44473, what a runtime plugin'sonResolveanswers without a namespace goes through the resolver, and auto-install came along. So a plugin that serves a virtual module under a bare name has that name asked of the registry first, and a package of that name is downloaded and run in place of the plugin's module.What told the two apart before
Before #44473,
onResolvewas asked again about its answer. If it answered, that was the key and the resolver was not involved: the name was the plugin's own. If it declined, or no filter matched, the answer went through the resolver, auto-install included: that is how a plugin redirects to a package.No test of the filters stands in for that, and two were tried in this PR. "The filter of an
onLoadmatches" takes"some-ui-lib/Button.svelte"for the plugin's own when there is anonLoadfor/\.svelte$/, which is a transform. "The filter of anonResolvematches" takes every redirect for the plugin's own when the filter is/.*/, as in the example in the documentation, whose callback declines what it does not know.Fix
An answer that is a bare name, which is the only kind that can reach the registry, is put to
onResolveonce more. If it answers, the name is the plugin's own and is resolved withGlobalCache::disable, which is--no-install. What it answers is not used otherwise, but for one that is not valid, which is the error it is the first time. An answer that is the specifier is not asked about: what would be said is known.An absolute or a relative answer, or one in a namespace, is not asked about again, as #44473 has it.
resolve_and_auto_installalready takes the mode.VirtualMachine::_resolveread it from the options; its one caller passes it now.disable, notread_only: tried,read_onlyasks the registry for the manifest, downloads and runs a package that is not in the cache, and lets a package in the cache take the place of the plugin's module.Measured
Linux x64. A registry on the loopback that serves version 1.0.0 of whatever it is asked, whose code says that it ran. A project with no
node_modules. "Before" is canary7fe13e1b9, which does not have #44473. Thirteen kinds of answer, by an import statement,import(),require()andrequire.resolve(), each with an empty global cache and with one that already holds a package of every name used: 104 cases.What the registry is asked (nothing, the manifest, the tarball) is what it was before #44473 in all 104.
onResolvemainonLoador not"real-package","real.package","real-package/index.js""some-ui-lib/Button.svelte", with anonLoadfor/\.svelte$/onLoadgets the file/.*/, and it declines all but one specifieronLoadserves88 of the 104 are the same in what they print too. The other 16 are a name that is the plugin's own and that nothing serves, where the registry is not asked then or now:
Cannot find packagesince #44473, and before itENOENT reading, or the name itself fromrequire.resolve()and from an import of an extension with no loader.Not changed
The last row: a plugin that serves a bare name which its own
onResolvewould not answer about has the registry asked first, in 1.4.2 as well. Nothing tells it from the row of"some-ui-lib/Button.svelte": in both, the filter ofonResolvedoes not match the answer and that of anonLoaddoes. Not installing what anonLoadwould be called for is what an earlier commit of this PR did, and it broke that row.What else changes
For a bare answer that a filter of
onResolvematches and that is not the specifier, the callback runs twice, where #44473 made it once and 1.4.2 has two or three times. The documentation and the comment inbun.d.tssay so.How did you verify your code works?
Twelve tests in
plugins.test.ts, with a registry on the loopback in the test's process. Each asserts the whole list of what the registry was asked, which always has an import that no plugin answers about, to show that auto-install is on in that project, and every call ofonResolve.import(),require(),import.meta.require(),require.resolve(),import.meta.resolve(),Bun.resolveSync(),Bun.resolve()): a name answered with itself and a name answered for another specifier, both served, are not asked of the registry.onLoadmatches it, and when the filter of anonResolvethat declines does.onResolveof its own is not put to it.onResolvesays about the bare name is an error if it is not valid.They pass on 1.4.2, which does not have the regression, so: with the condition made false, which is
main, the first ten fail; with the fix, they pass. The last two are about the second question itself: they fail on the commit that added it and pass on the next.test/js/bun/plugin,node-module-module.test.jsandmock-module.test.ts, debug: 193 pass, 0 fail.BUN_JSC_validateExceptionChecks=1on these tests, those of whatonResolveanswers and those of how often it is asked, 34 of them: no report.