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Updated 6:30 PM PT - Oct 17th, 2026
✅ @robobun, your commit 7db01022d1375d915dda4cabe34c3eef9c8835fb passed in 🧪 To try this PR locally: bunx bun-pr 45693That installs a local version of the PR into your bun-45693 --bun |
StatusReproduced on main with a release build. The layout:
The first test of PR: #45693 |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
WalkthroughBun.build now passes plugin-import relationships to the type checker. The checker follows eligible imports and checks discovered source files. Documentation and tests describe and cover which plugin-loaded files and imports are checked. ChangesPlugin-import type checking
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| Title check | |
The title clearly and specifically summarizes the main change: type-checking imports from plugin-loaded files when the project contains those files. |
| Description check | |
The description is detailed and on-topic. It explains the problem, fix, limitations, trade-offs, and verification results. It does not use the template headings exactly, but it provides the required i… |
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Explanation
The description is detailed and on-topic. It explains the problem, fix, limitations, trade-offs, and verification results. It does not use the template headings exactly, but it provides the required information through the Problem, Fix, and Tests sections.
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Inline comments:
Review comments at @src/sema/driver/lib.rs:
- Around line 3929-3931: Update the `None` match guard in the import-handling
flow to skip only direct JavaScript source imports when
`program.files.options.allow_js` is disabled. Let other missing source imports,
including TypeScript files, reach the general `None` arm so they are checked in
the next round.
- Around line 3905-3920: Build reusable indexes when through_links is created,
mapping FileId to its real path and linked paths to FileId, then replace both
through_links.iter().find searches in the import traversal with indexed lookups.
Preserve the existing behavior for missing entries and the own-import selection.
Review comments at @test/cli/check/plugin-imports.test.ts:
- Around line 84-86: Remove the `timeout` constant and the timeout argument from
each test invocation using `it` or `it.each` in this file, including the
debug-build timeout; leave Bun’s default timeout behavior in place.
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docs/runtime/check.mdxpackages/bun-types/bun.d.tssrc/bundler/bundle_v2.rssrc/bundler/options.rssrc/lint/graph/lib.rssrc/runtime/cli/build_command.rssrc/runtime/cli/check_command.rssrc/sema/baselines/lib.rssrc/sema/driver/host.rssrc/sema/driver/lib.rssrc/sema/resolve.rstest/cli/check/plugin-imports.test.ts
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Actionable comments posted: 1
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Inline comments:
Review comments at @src/bundler/bundle_v2.rs:
- Around line 2605-2606: Canonicalize both `file_map` keys and `path.text` to
the same path representation before computing `is_in_files`; update the
`FileMap` construction or lookup around `file_map_from_js` so an absolute
plugin-loaded path matches its equivalent relative `BuildConfig.files` key.
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docs/runtime/check.mdxpackages/bun-types/bun.d.tssrc/bundler/bundle_v2.rssrc/bundler/options.rssrc/runtime/cli/check_command.rssrc/sema/driver/host.rssrc/sema/driver/lib.rssrc/sema/resolve.rstest/cli/check/plugin-imports.test.ts
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
This version is a narrower design than the one I reviewed earlier: there is no second program pass any more, and a file the importer's program lacks is followed but not checked (docs/runtime/check.mdx and the commit title say so). The PR description's "Fix" section still says such a file "becomes one more root of the same project", which the code at src/sema/driver/lib.rs:4160-4199 no longer does — worth updating so a human reviewer reads the right contract.
Beyond the inline finding, I also checked the reach walk in check_named_files: cycles through plugin-only modules are bounded by is_followed, the through_links importer list is built in index order so the binary_search_by_key holds, and the per-module realpath now runs only when named is Some and skips lib and declaration files.
Extended reasoning...
The change adds a plugin-import edge table from the bundler (src/bundler/bundle_v2.rs, src/bundler/options.rs) through check_command.rs into the sema Host and the reach walk of check_named_files in src/sema/driver/lib.rs, plus docs, types and a 1,072-line test file; it touches no security-sensitive surface. Since my earlier review the second-pass/allowJs design was removed, which resolves the concerns I raised there, but the PR description still describes the old behavior. One pre-existing nit survived verification and is posted inline; the sema driver change is non-trivial enough that a maintainer should still look.
robobun
changed the title
… files of the program The type checker cannot read what only a plugin can read, like App.svelte, so it did not reach what App.svelte imports: main.ts imports App.svelte, which imports lib.ts, and a type error in lib.ts did not fail the build. The bundler passes each import into or out of the code that a plugin has loaded (TypeChecked::plugin_imports). The reach walk of check_named_files follows them beside the scripts of a page. A file of the program that such a file imports is reached, so it is checked. What only a plugin can read or provides is followed for what it imports. The program is not changed. A file that it does not have is not checked, as before: a file outside include or files, JavaScript where allowJs is off, and what only the bundler finds for an import. A plugin-loaded file that is an entry point still names what it imports.
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Problem
Bun.build({ check: true })passes whenmain.tsimportsApp.svelte(anonLoadplugin) andApp.svelteimportslib.tswith a type error. WithApp.svelteas the entry point, the build fails (bun check- a TypeScript type checker builtin to Bun #44361).App.svelte, solib.tsis not reached.to_check.retain(is_reached)incheck_named_files(src/sema/driver/lib.rs) drops the file.Fix
TypeChecked::plugin_imports).check_named_filesfollows these imports, as it follows the scripts of a page. A file of the program thatApp.svelteimports is reached, so it is checked.bun checkchecks too.test/cli/check/plugin-imports.test.ts(84 tests, 41 fail on main).check.test.tsandentry-points.test.ts: same as main. Self-reviewed: 33 concerns raised, 33 addressed (Notes).Background
tsconfig.jsonproject that the type checker loads.--checkreports only files that the entry points reach in it.Downsides
.tsfile that imports a named export of a component fails with TS2614 until the project declares it.tsconfig.jsonof the importer does not include, JavaScript whereallowJsis off, and every such file without atsconfig.json.Notes
How it was found. By probing, not from a user report. The review of #44361 handled the entry-position case ("an entry that cannot be checked by name must still have its JS/TS imports named for the check"). This is the position that the Svelte plugin README documents:
entrypoints: ["src/index.ts"].The rule. The reach walk follows what the bundler has bundled for the imports of a plugin-loaded file.
App.svelte), or only a plugin provides it (App.vue?type=script): it is not checked. What it imports is followed.A.svelte -> a.js -> B.svelte -> b.ts.node_modules: it is not followed.Still not checked (as on main).
tsconfig.jsondoes not include it, there is notsconfig.json, it is JavaScript andallowJsis off, or only the bundler resolves the import to it (for exampledist/index.jswhere TypeScript takesdist/index.d.ts).svelte-checkandvue-tsccheck it.main.ts -> widget.js -> App.svelte -> lib.tswhere the type checker does not readwidget.jsand no plugin loads it.defineremoves.require()in TypeScript (documented as not covered), thebrowsermap,.tsxbeside.ts, main fields, per-packagepaths, anonResolveredirect between ordinary files. This PR is about the one kind that has no remedy in TypeScript.bun --check,bun test --check, the dev server): they have no bundle. The page rule scans the file itself, so it works there. A scan of the script of a component could do the same (bun lint,bun check: native support for framework components (Vue, Svelte, Astro), asbun fmthas #45163).Two rules by entry position. A plugin-loaded file that is an entry point still names what it imports (main's rule from #44361). A named file is checked by its nearest
tsconfig.json, and a named.jsfile turnsallowJson. So one graph can give two results: withmain.tsandApp.svelteboth as entry points, the imports ofApp.svelteare named. The test "a plugin-loaded file that is an entry point names what it imports" pins this.Not in this PR: a file that the program lacks. The first revision checked such a file in one more program of the same project. The reviews found clean builds that this turned red, so the rule is out of this PR:
allowJson for it (TS2578 for a// @ts-expect-errorabove an import of a.jsfile).dist, that is JavaScript that TypeScript never reads for the import (TS7006 withallowJsandcheckJs).references, the extra program built the referenced projects again: 4 programs and 104 checked files where main has 2 and 51.A follow-up can add the files as roots before the first program loads. It needs the written specifier (
ImportRecord::original_path), so that TypeScript decides what an import leads to.Measured. The binaries are release builds of main at 017b243 and of this change on that commit. The tools are gdb breakpoint counts on the mimalloc entry points and on the function that checks one file, a ptrace syscall counter, and
size.bun check: 69,979 allocation calls on main and here.bun buildwithout--check: 41,097 on main and here.accesscalls: 308 on both.readlinkcalls: 10 on main, 13 here.main.tsimports and 100 more behind a component, notsconfig.json: 101 files are checked on main and here.Host::plugin_importsis called once for each program. Without plugins there are 0 lookups.pathsof its own): all pass on main and here. 6 failed on the first revision of this PR.git merge-fileagainstclaude/compile-aot-on-check(43c2fcf): 1 conflict region, intype_check, where this change adds a block beforelet mut entry_points. Both sides stay. The exhaustiveTypeCheckedpattern in that branch then needsplugin_imports.bun run rust:check-all x86_64-pc-windows-msvc aarch64-apple-darwin: 2 ok.Tests. The tests are in a new file.
check.test.tsandentry-points.test.tsdo not pass in a debug build on a small machine: many tests time out there on unchanged main. The fixtures of the new file usenoLibwith declared global types, so a test takes about 1 s in a debug build. Seven tests load the libraries of TypeScript or the compiler of Svelte. Only those have a timeout, and only in a debug build. The six project kinds ofentry-points.test.tsare rows of the new file. Four tests use thebun-plugin-svelteof this repository.Self-review. The last self-review raised 33 concerns about the revision before this one. Most were about the extra program for a file that the program lacks. That rule is removed (see above). The others are done here: the bundler passes an import into a plugin-loaded module only if the plugin returned code, a file of the
filesoption that a plugin loads is a file of the project, the lookup through links takes source files only and is a binary search, the docs link points at theBun.buildsection, and the tests pin the clean builds.Questions for the maintainer.
tsconfig.json, and a named.jsfile turnsallowJson.