test(bun-types): replace the tsgo and Bun.mmap spawns with one whole-fixture tsc run, enforced by a lint - #39270
test(bun-types): replace the tsgo and Bun.mmap spawns with one whole-fixture tsc run, enforced by a lint#39270robobun wants to merge 4 commits into
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…on debug builds too Every typeTest case in bun-types.test.ts is skipIf(isDebug), and so was the tsgo case, so `bun bd test` on this file checked nothing in the fixture except the three Bun.mmap lines in a one-off tsc spawn. The fixture's `typescript` dependency now resolves to the native TypeScript 7 compiler, which checks the whole fixture in well under a second, so: - beforeAll writes the tsconfig (skipLibCheck off, include *.ts/*.tsx) into the base fixture, making it and every copy a project a compiler CLI can be pointed at with `-p .`; the tsgo case and the keep-temp-dir branch of afterAll stop writing their own. - A new case spawns the fixture's own tsc over it on every build. - The tsgo case shares the spawn/assert helper and stays release-only. - The Bun.mmap spawn block goes away; fixture/bun.ts already holds those assertions, and the new case checks them under bun bd.
WalkthroughChangesThe bun-types integration harness now creates one shared Bun types compiler checks
Possibly related PRsPossibly related PRs
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Comment |
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Status: ready for review at 675c618. Test and workflow changes only; no Reproduced on main with the debug build: |
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LGTM — test-infrastructure refactor that makes the fixture type-check run under debug builds and consolidates the spawned-compiler cases into shared helpers.
What was reviewed:
- Verified
src/cli/init/tsconfig.default.jsonhasnoEmit: true, so the new tsc case running againstBASE_FIXTURE_DIRleaves the shared fixture untouched as the comment claims. - Confirmed the removed
Bun.mmapblock's assertions are already infixture/bun.ts:85-95, which the new always-on tsc case covers. - Checked that
diagnose()builds options fromsourceTsconfigin-process and never reads the new on-disktsconfig.json, so the exact-diagnosticstypeTestcases are unaffected. - Confirmed
mkdir/makeTreeimports remain live (used inbeforeAll);packageBin'sjoin(..., "@typescript/native-preview")is equivalent to the previous three-segment form.
Extended reasoning...
Overview
This PR refactors test/integration/bun-types/bun-types.test.ts — the integration test that packs bun-types and type-checks a fixture project against it. The change: (1) writes a tsconfig.json into the base fixture in beforeAll so any tsc-compatible CLI can be pointed at it with -p .; (2) adds shared packageBin and expectCliToAcceptFixture helpers; (3) adds an always-on test case that spawns the fixture's own tsc on the base fixture (this is what runs under bun bd test); (4) refactors the tsgo case to use the shared helpers; (5) removes the one-off Bun.mmap describe block whose assertions duplicate fixture/bun.ts:85-95; (6) drops the now-redundant tsconfig write from the keep-temp-dir branch of afterAll.
Security risks
None. Test-only change; no runtime code, no auth/crypto/permissions, no untrusted input handling.
Level of scrutiny
Low-to-moderate. This is test infrastructure with no effect on shipped code, and the file is excluded from BuildKite (runs only in the bun-types.yml workflow on release bun and locally). The main risks would be (a) the new tsc case emitting into the shared fixture and breaking later cases, or (b) the on-disk tsconfig changing behavior of the in-process typeTest cases. Both were checked: the source tsconfig sets noEmit: true, and diagnose() builds compiler options from DEFAULT_COMPILER_OPTIONS via the LanguageService host without ever reading the fixture's tsconfig file.
Other factors
- The PR description includes thorough verification: release run (15 pass), debug run (3 pass / 12 skip, tree clean), and negative probes showing the new case fails on both a broken fixture assertion and a broken
.d.tsunderbun bdwhere main's version passes. - The refactor follows the repo's deduplication guidance: the second spawn-tsc block became a named helper used at every parallel site, and the dead
Bun.mmapblock is deleted rather than left alongside its fixture equivalent. - No dead imports introduced:
mkdirandmakeTreeare still used inbeforeAll. path.join(dir, "node_modules", "@typescript/native-preview")normalizes the embedded slash on both POSIX and Windows, matching the previous three-segment form.
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The bun-types test suite is an interesting one because it's unrelated to Bun itself. E.g. |
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Updated 11:50 PM PT - Aug 15th, 2026
✅ @robobun, your commit 675c618f15623a9603f153831a3d77241cb8af03 passed in 🧪 To try this PR locally: bunx bun-pr 39270That installs a local version of the PR into your bun-39270 --bun |
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Actionable comments posted: 1
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In `@test/integration/bun-types/bun-types.test.ts`:
- Around line 151-156: Update packageBin to validate the selected bin value
before calling join: accept the string bin form or the named bin entry, and when
the resolved value is missing or invalid, throw an error that identifies the
package.json resource, requested CLI name, rejected value, and required bin
configuration. Keep the existing path construction for valid values.
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…lve an entry point
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Agreed, and CLAUDE.md already sends people to
The debug-build part is only that the new case is not skipped there: the checking happens in the native binary either way (1.3s under the debug build, all of it startup), and it being always-on is what removes the reason those per-API blocks get written when a PR is verified with the debug build. I have reworded the title and description to lead with the first two points rather than the debug angle. |
robobun
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LGTM — test-harness refactor that gives bun bd test real coverage of the bun-types fixture without slowing anything down.
What was reviewed:
- Confirmed
fixture/bun.ts:85-95already carries theBun.mmapassertions the removed block duplicated, and the new tsc case checks that file. - Confirmed
src/cli/init/tsconfig.default.jsonsetsnoEmit: trueand noincremental, so runningtsc -p .directly inBASE_FIXTURE_DIRleaves no artifacts for latercreateIsolatedFixturecopies to pick up. - Confirmed
createIsolatedFixturecopies fromBASE_FIXTURE_DIR, so the tsgo case inherits the tsconfig now written inbeforeAlland no longer needs its own. - No dead imports:
mkdirandmakeTreeare still used inbeforeAll.
Extended reasoning...
Overview
Single-file change to test/integration/bun-types/bun-types.test.ts. The PR moves the fixture's tsconfig.json write into beforeAll (previously written per-run by the tsgo case and again in afterAll's keep-temp-dir branch), extracts two helpers (packageBin, expectCliToAcceptFixture) from the existing tsgo spawn logic, adds a new always-on case that spawns the fixture's own tsc -p . on BASE_FIXTURE_DIR, refactors the tsgo case to use the helpers, and deletes the one-off Bun.mmap describe block whose assertions already live in fixture/bun.ts.
Security risks
None. Test-only; no src/ or packages/ diff. The spawn is bunExe() running a bin from the fixture's own node_modules in a temp directory — the same pattern the file already used for tsgo and the removed mmap block.
Level of scrutiny
Low. This is test infrastructure for .d.ts type-checking, excluded from Buildkite (.buildkite/ci.mjs skips this file) and run only by the bun-types.yml GitHub workflow on a release bun, which the author reports passed on this branch. The behavioral surface for release builds is unchanged: the LanguageService typeTest cases build options from sourceTsconfig in-process and never read the on-disk tsconfig, and the tsgo case runs the same -p . on the same include/skipLibCheck config it wrote itself before. The net addition is one extra tsc spawn (~0.3s release, ~1.3s debug per the description).
Other factors
I verified the load-bearing claims: (1) fixture/bun.ts:85-95 contains the Bun.mmap offset/size/return-type assertions, so removing the dedicated block loses no coverage — the new tsc case checks the whole fixture including that file; (2) the source tsconfig has noEmit: true and no incremental/composite, so running tsc in the shared BASE_FIXTURE_DIR writes nothing; (3) mkdir and makeTree remain used in beforeAll, so no dead imports were introduced. expectCliToAcceptFixture follows the harness convention (await using, concurrent drain of stdout/stderr/exited, output asserted before exit code). CodeRabbit's one minor (validate the bin entry before join()) was addressed in c55cd57 and confirmed resolved. The alistair-bot comment is an observation about bun bd vs release for this file, not a change request, and the PR is already aligned with it (expensive LanguageService cases stay release-only; only the cheap native-compiler spawn runs on debug).
…d compiler @typescript/native-preview stopped being published the day typescript@7.0.2 shipped (its last build is an ancestor of 7.0.2 with the same bin shim), so the tsgo case re-ran an older build of the compiler the tsc case already runs. With it gone the two helpers had one caller each and are inlined. Every per-API block that has been copied into this file spawns a compiler, so a source lint holds the file at exactly one spawn site and points at fixture/*.ts; the source-lints workflow now also triggers on this file.
robobun
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robobun
changed the title
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Follow-up to the above, pushed as 675c618:
Description updated to match. |
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I reviewed this PR and didn't find any bugs. A human look would still be worthwhile: the head commit (675c618) drops the tsgo case entirely and adds a source-lint pinning the file to a single Bun.spawn site, but the PR description still describes c55cd57 (tsgo kept, packageBin/expectCliToAcceptFixture helpers). The author flagged dropping tsgo as an open question for the reviewer and then acted on it in 675c618 without a visible reply, so a maintainer should confirm that trade-off and the new lint.
What was reviewed:
- The written
tsconfig.jsonderives fromsrc/cli/init/tsconfig.default.jsonwhich setsnoEmit: true, so runningtsc -p .inBASE_FIXTURE_DIRleaves the shared fixture untouched as the comment claims. - The removed
Bun.mmapassertions are covered byfixture/bun.ts:83-95, which the new whole-fixture case checks. typeTestcases build options fromsourceTsconfigin-process via aLanguageServiceHostand never read the on-disk tsconfig, so their exact-diagnostic lists are unaffected.- The new source-lint's
../../../resolution and\bBun\.spawn(Sync)?\(pattern match exactly the one spawn site in the current file.
Extended reasoning...
Overview
Test-infrastructure change touching three files: the bun-types integration test now writes a tsconfig.json into the base fixture during beforeAll and adds a single spawned tsc -p . case over the whole fixture (not skipped on debug builds); the per-API Bun.mmap block and the tsgo case are removed; a new source-lint in test/internal/source-lints/ asserts the file has exactly one Bun.spawn call site; .github/workflows/source-lints.yml gains test/integration/bun-types/bun-types.test.ts as a path trigger. No src/ or packages/ changes.
Security risks
None. Test-only change; no auth, crypto, network, or user-input handling. The workflow edit only adds a path filter.
Level of scrutiny
Medium. The mechanics are straightforward and the bug-hunting pass found nothing, but the head commit makes two decisions a maintainer should confirm: (1) removing the @typescript/native-preview (tsgo) case — the argument is that typescript@latest is now the native compiler and the preview is stale at 7.0.0-dev, so coverage is superseded rather than lost, which seems sound but was flagged by the author as an open question; (2) a new source-lint that constrains this file to one spawn site going forward. The PR description also still describes the c55cd57 state (tsgo kept, packageBin helper) and the "15 pass" count, which no longer matches 675c618.
Other factors
The one CodeRabbit thread (validate packageBin bin entry) is moot at HEAD since packageBin was removed with the tsgo case in 675c618. The bun-types workflow reportedly passed on this branch. The alistair-bot comment addressed the debug-build framing, which the author responded to by rewording the description, but did not address the tsgo question.
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Re the review above: the description was rewritten for 675c618 (the tsgo removal and the lint are in the Problem and Fix bullets; the c55cd57 shape is under "Earlier revisions"), and the reasoning for dropping the tsgo case instead of waiting is in the follow-up comment posted with that push (#39270 (comment)). Both of those landed after that review started. The two things it asks a maintainer to confirm, dropping the tsgo case and adding the lint, are indeed the judgment calls in this PR; restoring the case is a one-block revert if preferred. |
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Problem
typescript: latest, 7.0.2 today). ThetypeTestcases drive the typescript@6 intest/node_modulesthrough the LanguageService API, the tsgo case installs@typescript/native-preview, and the fixture's owntscis only ever run by thedescribe("Bun.mmap")block (bun-types.test.ts:370-401 on main) over three lines thatfixture/bun.ts:85-95already asserts.@typescript/native-previewstopped being published the day typescript@7.0.2 shipped (Prepare main for 7.1 nightly builds microsoft/typescript-go#4558 moved the nightlies totypescript@next); its last build,7.0.0-dev.20260707.2, is built from an ancestor of the 7.0.2 commit (gh api repos/microsoft/typescript-go/compare/9977d6d...2bd066d: 15 release and editor commits ahead, 0 behind), so the tsgo case (:339-368) re-runs an older build of the compiler the fixture already installs and will never see anything newer.fixture/redis.ts; others rename the hunk into helpers of their own), duplicating assertions that belong in the fixture and conflicting with each other. The reason it gets copied is that it is the only case in the file not markedtest.skipIf(isDebug), so it is all that runs when a.d.tsPR is verified with a debug build. Running this file with a debug build is the wrong tool to begin with (CLAUDE.md says to use a release bun;.buildkite/ci.mjs:801leaves it to.github/workflows/bun-types.yml), but the copies keep coming: several were opened after this PR, and most of them merge cleanly onto it (for example bun-types: type Subprocess stdio properties by what the runtime exposes for each stdio option #39283 and bun-types: type Subprocess.send(message, handle, options, callback) and the ipc callback's handle #38662:git merge-treeagainst this branch succeeds and the merged file has two spawn sites again).Fix
beforeAllwrites atsconfig.jsoninto the base fixture (the defaultbun inittsconfig withskipLibCheck: falseandinclude: ["*.ts", "*.tsx"], which is what the tsgo case used to write per run), so the fixture is a projecttsc -p .can be pointed at. ThetypeTestcases build their options in-process from the same source and never read the file; their exact diagnostics lists still pass.tsc (the fixture's typescript dependency) > checks without lib.dom.d.ts, spawns the fixture's ownnode_modules/typescript/bin/tsc -p .in the base fixture (noEmit, nothing to isolate) and expects no output and exit 0. On a release run this is the compilerlatestresolves to checking the whole fixture (0.3s here). It is notskipIf(isDebug): the checking happens in the native binary whichever bun spawns the shim (1.3s under the debug build, all of it startup), so a types PR only has to add its assertions tofixture/*.ts, and they fail without the.d.tschange under either build.Bun.mmapblock are removed. The tsgo case is superseded as described above (if a forward-looking check is wanted again, it would betypescript@nextinstalled into a fixture copy, which brings back the floating-nightly breakage of Fix bun-types CI: resolve tsgo entrypoint from the package bin field #33017, so that is left as a separate decision); the mmap assertions are infixture/bun.ts, which the new case checks. The keep-temp-dir branch ofafterAllstops writing a second tsconfig.test/internal/source-lints/bun-types-test-spawn-sites.test.tsasserts that bun-types.test.ts contains exactly oneBun.spawn(site and, on failure, lists the sites and says to add the assertions tofixture/*.ts. Every one of the copied blocks spawns a compiler (checked on a dozen of them), so this is what stops the clean-merging branches from putting the template back;source-lints.ymlnow triggers on this file as well (the README in that directory asks for that when a lint reads a file outside its paths). The lint fails on main's version of the file (two sites) and when a block is appended to this one, and passes on this branch.bun test test/integration/bun-types/bun-types.test.ts(release): 14 pass.bun bd teston it plus the lint: 4 pass / 11 skip, tree clean afterwards.bun test test/internal/source-lints/with the released bun, as the workflow runs it: 171 pass. Probes below show the new case failing on a broken fixture assertion and on a broken.d.ts, and main's version of the file passing with the same broken fixture.Background
packages/bun-types, installs the tarball into a copy oftest/integration/bun-types/fixture/(a project whose*.tsfiles only exist to be type-checked, with atypescript: latestdependency) and type-checks that fixture. ThetypeTestcases do this in-process through TypeScript's LanguageService API, using the typescript (6.x) intest/node_modules, and compare exact diagnostics; driving that API inside a debug build is whatskipIf(isDebug)was added for in test(bun-types): resolve lib.d.ts from the compiler's own TypeScript install #33940.typescript@7on npm is the native (Go) compiler:bin/tscis a small JS shim thatexecve()s the platform binary from@typescript/typescript-<os>-<arch>, and the package has no LanguageService API. That is why checking with it means spawning it, and why the spawn costs the same regardless of which bun does it.@typescript/native-previewwas the pre-release channel for that compiler.skipLibCheck: falsemakes tsc report errors inside the.d.tsfiles themselves (bun-types and@types/node), not only in the fixture's.tsfiles; the in-process cases force it off for the same reason (@types/bunstill conflicts with@types/node#8761).test/internal/source-lints/holds grep-style checks over the tree that run against a released bun insource-lints.ymlwithin seconds of a push; the workflow only runs for the paths listed in it.Probes (debug build)
Broken fixture assertions, appended to
fixture/bun.ts:With this PR,
bun bd test test/integration/bun-types/bun-types.test.ts:Same broken fixture with main's
bun-types.test.ts:Broken declaration (
declare const x: DoesNotExist;appended topackages/bun-types/bun.d.ts), with this PR:The lint after appending a spawned block to bun-types.test.ts:
Timing of the whole-fixture check on a prepared fixture copy:
bun node_modules/typescript/bin/tsc -p .0.34s; the same throughbuild/debug/bun-debug1.33s. Copying the prepared fixture (1101 files, 38MB) withfs.cptakes 0.2s on the release build and 4.0s on the debug build, which is why the new case does not go throughcreateIsolatedFixture.Earlier revisions of this PR
bun bd teston this file reporting 3 pass / 12 skip and passing on a broken fixture); as noted in the comments this file is not meant to be run with a debug build, so the description now leads with what changes on a release run.packageBin/expectCliToAcceptFixturehelpers with the new case. Review turned up that@typescript/native-previewis discontinued and an ancestor of thetypescriptthe fixture installs, so 675c618 removes that case, inlines the single remaining spawn, and adds the source lint and workflow path.