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…up already lists The three checks in InitCommand::exec that decide which packages to add each looked in one or two groups of the manifest. A package under another group got a second entry, and the nested install ran. Look up the four dependency groups once and ask one predicate for every package that bun init adds. An optional peer counts only in the group that the new entry goes to, because bun install does not install it.
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Walkthrough
ChangesInit dependency detection
AST property lookup cleanup
Suggested reviewers: Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
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| Title check |  |
The title clearly identifies the main change: preventing init from adding duplicate @types/bun or typescript dependencies. It is grammatically awkward and does not mention every supported dependency g… |
| Description check | |
The description provides detailed problem context, implementation details, verification results, limitations, and reproduction steps. It does not use the exact template headings, but it covers the req… |
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Check skipped because no linked issues were found for this pull request. |
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Full details: Title check
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Explanation
The title clearly identifies the main change: preventing init from adding duplicate
@types/bunor typescript dependencies. It is grammatically awkward and does not mention every supported dependency group, but it remains specific and related to the changeset.
Full details: Description check
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Explanation
The description provides detailed problem context, implementation details, verification results, limitations, and reproduction steps. It does not use the exact template headings, but it covers the required content substantially.
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Status: ready for review. How I reproduced it, on a release build of main 017b243 with the real registry: D=$(mktemp -d); cd "$D"
bun add @types/bun@1.1.0
bun init -y
cat package.json
PR: #45836 |
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Updated 3:05 AM PT - Oct 21st, 2026
❌ @robobun, your commit fc56f7e has 2 failures in
🧪 To try this PR locally: bunx bun-pr 45836That installs a local version of the PR into your bun-45836 --bun |
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Beyond the inline findings, I also checked whether widening needs_dependencies to all four groups changes bun init --react over a manifest that lists react only in devDependencies/peerDependencies — it does not, because the React templates return from exec before this block (src/runtime/cli/init_command.rs:615-621), so needs_dependencies only ever iterates the empty Blank/Library list. The optionalDependencies + --omit=optional case was also examined; it is the same shape as the required-peer finding already posted, not a separate issue.
Extended reasoning...
The change rewrites the three "is this default dependency already listed" checks in the existing-package.json path of bun init into one predicate over the four dependency groups plus an optional-peer exception, and adds two test.each matrices against a local 404 registry. It touches no security-sensitive surface. Three inline findings were posted (required-peer with install.peer=false, peerDependenciesMeta without a peerDependencies key, and a per-test timeout nit), which is why this is not an approve; the note records sibling paths checked and ruled out.
…-any-dependency-group
bun install does not install every peer: it skips an optional peer, and install.peer = false skips all of them. A package.json that lists @types/bun only under peerDependencies keeps the devDependencies entry that bun init adds on main, and the check does not read peerDependenciesMeta. The new tests use the default timeout.
robobun
changed the title
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Follow-up to the review, in f4ef844:
The title and the description now state this rule, with new measurements. |
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @test/cli/init/init.test.ts:
- Line 383: Update both test.each tables containing process cases to use
test.concurrent.each, preserving their existing cases and setup so the cases run
concurrently with their separate temporary directories and registries.
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src/runtime/cli/init_command.rstest/cli/init/init.test.ts
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…-any-dependency-group
bun init was its last caller outside a unit test.
| expect(after.manifest).toEqual({ ...manifest, ...added }); | ||
| // `bun init` added a dependency, so the nested `bun install` runs and asks for @types/bun. | ||
| expect(after.requests).toContain("/@types/bun"); |
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🟡 nit (optional): maintainers get a test matrix that never checks how bun init exited, unlike its sibling matrix at test/cli/init/init.test.ts:411. The second test.each at test/cli/init/init.test.ts:439-441 asserts only the manifest and the registry requests, while initOverPackageJson already returns exitCode, stdout and stderr. test/CLAUDE.md says to always check exit codes. Fix: assert exitCode is 0 for every row (for example expect(after).toMatchObject({ exitCode: 0 }) as the first matrix does), so a crash or error exit after the manifest write still fails the test.
Why this was flagged
The second parameterized test added at test/cli/init/init.test.ts:414-442 runs bun init over a prepared package.json via initOverPackageJson (test/cli/init/init.test.ts:352-381), which returns { manifest, requests, stdout, stderr, exitCode }. The test body at test/cli/init/init.test.ts:439-441 only checks after.manifest and after.requests; after.exitCode is never read. The sibling matrix in the same diff checks it at test/cli/init/init.test.ts:411. test/CLAUDE.md:201 reads "Always check exit codes and test error scenarios". The nested install failure is ignored by let _ = bun::spawn_sync_inherit(...) at src/runtime/cli/init_command.rs:943, so bun init exits 0 here today and the assertion is cheap; without it a future crash or nonzero exit that happens after package.json is written passes these three rows. The base branch has neither test, so this is a convention slip in the new code only.
Verification: nit. In the diff of test/cli/init/init.test.ts, the second matrix asserts only after.manifest and after.requests; after.exitCode (returned by initOverPackageJson) is never read. test/CLAUDE.md:201 reads "Always check exit codes and test error scenarios". A bun init that writes the manifest, triggers the install request, and then exits nonzero would still pass these three rows.
Problem
bun initover an existingpackage.jsonadds@types/bunandtypescriptagain whendependenciesoroptionalDependencieslists them. Afterbun add @types/bun@1.1.0,bun init -yaddsdevDependencies["@types/bun"] = "latest". The nested install printswarn: Duplicate dependency: "@types/bun" specified in package.jsonand replaces 1.1.0 with 1.4.3.InitCommand::exec(src/runtime/cli/init_command.rs:704-739) each read one or two groups.Fix
dependencies,devDependenciesoroptionalDependencieshas it.Expr::has_any_property_namedloses its last caller and is deleted.peerDependenciesentry counts only fortypescript, whichbun initwrites there.bun installdoes not install every peer, so@types/bunbeside a peer is still added.test/cli/init/init.test.ts, 7 new tests (main fails 5, 2 are controls), 29 of 29 pass. Self-reviewed: 20 concerns raised, 18 addressed, 2 in part (Notes).Background
bun initadds@types/buntodevDependenciesand, without--minimal,typescripttopeerDependencies. It runsbun installonly when it added an entry.install.peer = false,@types/bunis not installed andbun checkfails.Downsides
bun init. No new allocation or syscall.@types/bunonly underpeerDependenciesstill gets adevDependenciesentry, also when the peer is pinned.Notes
Where this comes from. No issue and no user report exist. The defect was found by a read of the code. The notes of #44992 record it first, under "Not changed here". These docs commands write the manifests that trigger it:
bun i @types/bun(docs/guides/install/from-npm-install-to-bun-install.mdx:21) andbun add @types/bun --minimum-release-age 259200(docs/pm/cli/install.mdx:305) writedependencies.Repro (release builds of main 91e7e3b and of this branch, real registry):
bun init -ydevDependencies["@types/bun"] = "latest",peerDependencies.typescript = "^7",name,module,type,private,scripts.typecheckdevDependenciesentrywarn: Duplicate dependency: "@types/bun" specified in package.json@types/bunbun initstill sets the other fields and still installstypescriptin this example. #44992 coverstypeandprivate.The rule. A package counts as listed when it is a key of a group, with any value. The groups that count are
dependencies,devDependencies,optionalDependencies, and the group that the new entry goes to. SopeerDependenciescounts fortypescript, whichbun initwrites there, and not for@types/bun.@types/bunlisted indevDependenciesdevDependenciesdependenciesoptionalDependenciespeerDependencies, required or optionaltypescriptlisted in^7topeerDependenciesdevDependenciesorpeerDependenciesdependenciesoroptionalDependencies^7Why a peer entry does not count for
@types/bun. The first version of this PR counted a required peer as listed and readpeerDependenciesMetafor an optional one. Two manifests showed the cost. Both were run on release builds:docs/guides/install/add-peer.mdxprints):bun installdoes not install it. When it counted as listed,bun checkfailed witherror TS2688: Cannot find type definition file for 'bun', because thetsconfig.jsonthatbun initwrites has"types": ["bun"].install.peer = falseinbunfig.toml:bun installinstalls no peer. When it counted as listed,@types/bunwas not installed andbun checkfailed. On main it passes.With the rule above,
bun initgives the same result as main for every manifest that lists@types/bunonly as a peer. The check does not readpeerDependenciesMeta. The cost is the second Downsides bullet.Tests. On main, 5 of the 7 new tests fail: the first three rows of
adds no dependency when ...and the first two rows ofadds only the dependency that is missing when .... Two pass on main on purpose.devDependencies lists @types/bun and peerDependencies lists typescriptis the control for the groups that main already reads.peerDependencies lists @types/bunfails if a peer entry counts for another group.Measurements. Release builds (
--profile=release) of the same checkout with main'sinit_command.rsand with this PR's.bun initran with a closed registry port and an empty cache. Each count is the same in two runs.bun init-y, empty directory-m -y, empty directory-y, over its own output-m -y, over its own output-y, 200 entries underdependenciesstepifrom the first group lookup to the first call after the checks.perfandvalgrindare not installed.malloc,mi_*andoperator newentry symbols of the parent process. Syscalls: a ptrace counter.straceis not installed.dependencies.InitCommand::exec17,856 → 19,266 bytes, 3,554 → 3,828 instructions (nm -S,objdump -d). Text ofbun: 107,074,067 → 107,075,091 bytes (size).bloatyis not installed. The measured build already has noExpr::has_any_property_named(420 bytes on main): nothing called it, so the linker dropped it.package.json, the file list and stdout are identical between the two builds on 11 of 11 manifests that do not hit the defect (cmp). Four of them list@types/bunonly as a peer.Other shapes. An earlier version of the predicate was also built as a helper function that looks the groups up again for each package. It was 512 bytes smaller and made 8 group lookups on a fresh
-y, against 4 on main. Not built: an inline loop in the two live checks (it leaves the third check on one group), and a delegate tobun --only-missing add(one child process for each group, andbun addsaveslatestas a resolved range).Overlap with open PRs. Counted with
git merge-tree, conflict hunks ininit_command.rs, main → this branch:needs_dependenciescheck, whose template list is empty for the Blank and Library templates. This PR edits that check so that no check reads one group. Take the deletion.typescripttodevDependencies): 1 → 1. When it moves the write, thetargetargument of thetypescriptcheck moves with it.This PR is not based on any of them.
Not changed here.
package.jsonthat markstypescriptoptional inpeerDependenciesMetaand has nopeerDependenciesentry for it still getspeerDependencies.typescript = "^7", as on main.bun createstarts its nested install only whendependenciesordevDependencieshas an entry (src/runtime/cli/create_command.rs:883-890,:1061). That is a different question in a different command.InitCommand::exec(entry point,.gitignore, README, tsconfig,typecheckscript) keep main's rules.bun install.Reviews. Self-review, the 2 concerns addressed in part: it sampled how often public manifests have these shapes, and I did not verify those rates, so they are not cited. The sites under "Not changed here" have no tracker. After the review on this PR, a peer entry no longer counts for another group, and the new tests use the default timeout. The
mordantlint job then reportedExpr::has_any_property_namedas public and unused, so it is deleted here with its line in abun_parsersunit test.no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/cli/init/init.test.ts