[jan-kubica]

The shared bun value becomes a minimum instead of an exact pin.

• The repository's Bun is its root packageManager release when that is an exact release at or above the shared value; otherwise the check falls back to the shared value and reports the existing bun-pins diagnostic.
• checkToolchain and the cloud setup generator derive one effective policy from that release, so nested manifests, bun-types, setup-bun selectors, Bun images, version files and mise/asdf entries must all equal the repository's pin.
• The typecheck parity runtime check accepts an exact release at or above the minimum.
• A repository can therefore move to a newer Bun on its own, without a policy release and a config bump everywhere.

Tests: unit tests for the repository Bun and the runtime floor, and the CLI test now passes a later exact release while an older one still fails.

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• Repository: stella/tooling
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Reviewing files that changed from the base of the PR and between e9025e6 and da84258.

📒 Files selected for processing: 1

• packages/oxlint-config/src/toolchain-bun.ts

📝 Walkthrough

The shared Bun version is now a minimum. Tooling selects a valid exact Bun pin from the repository root when it meets that minimum, and uses the minimum otherwise. Toolchain checks and cloud setup use the derived version.

Changes: Bun version policy

Layer / File(s)	Summary
Define the Bun minimum contract .changeset/bun-floor.md, README.md, packages/oxlint-config/README.md	The shared Bun value is documented as a minimum. Repository references must match one exact root pin at or above it.
Select a repository Bun version packages/oxlint-config/src/toolchain-bun.ts, packages/oxlint-config/src/toolchain-bun.test.ts	repositoryBun selects a valid root Bun pin at or above the floor, or falls back to the floor. satisfiesBunFloor checks whether a version meets the floor. Tests cover both functions.
Apply the derived Bun version packages/oxlint-config/src/toolchain-guard.ts, packages/oxlint-config/src/cloud-setup-cli.ts, packages/oxlint-config/src/typecheck-parity.ts, packages/oxlint-config/src/toolchain-packages.ts, packages/oxlint-config/src/toolchain-check.test.ts	Toolchain checks and cloud setup use a Bun value derived from the root manifest. Version checking accepts releases at or above the minimum. The diagnostic and CLI test reflect this policy.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant CloudSetupCLI
  participant SharedToolchainPolicy
  participant repositoryBun
  participant generateCloudSetup
  CloudSetupCLI->>SharedToolchainPolicy: Load and parse the shared policy
  SharedToolchainPolicy-->>CloudSetupCLI: Return the Bun minimum
  CloudSetupCLI->>repositoryBun: Pass the minimum and package.json content
  repositoryBun-->>CloudSetupCLI: Return the qualifying pin or minimum
  CloudSetupCLI->>generateCloudSetup: Pass the derived policy

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Possibly related PRs

• stella/tooling#202: Pins Bun in the shared toolchain and root packageManager; this PR defines the shared value as a minimum and derives the effective version from the root pin.

Merge Risk: 🟡 Moderate · up to e9025

The Bun minimum check accepts prerelease Bun versions that the new tests say must be rejected, so the test suite would fail and prerelease pins could be selected as the repository policy. A missing root Bun pin can also go unreported in some repository setups. Fix the prerelease handling before merging.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: the shared Bun value becomes a minimum.
Description check		The description is directly related to the changes. It explains the new Bun minimum behaviour, policy derivation, validation rules, and tests.
Docstring Coverage		No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 7…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 7 files. (3 skipped: 3 unsupported.)

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Actionable comments posted: 2

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @packages/oxlint-config/src/toolchain-bun.ts:
- Line 23: Update both Bun floor predicates using gte(version, floor) to reject
versions with a prerelease component before comparing them against the floor, so
prerelease versions such as 1.4.5-canary.1 are not accepted.

Review comments at @packages/oxlint-config/src/toolchain-guard.ts:
- Line 263: Add an unconditional root Bun pin check in the toolchain validation
flow once Bun usage is established, so a missing root packageManager produces a
bun-pins diagnostic even when no workflow references the root manifest. Keep the
existing workflow-based validation and package-file checks unchanged.

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ℹ️ Review info

⚙️ Run configuration

• Source mode: Auto
• Repository: stella/tooling
• Branch: main
• File: .coderabbit.yaml
• Commit: 2d69920
• Layers: Repository YAML
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📥 Commits

Reviewing files that changed from the base of the PR and between 2d69920 and e9025e6.

📒 Files selected for processing: 10

• .changeset/bun-floor.md
• README.md
• packages/oxlint-config/README.md
• packages/oxlint-config/src/cloud-setup-cli.ts
• packages/oxlint-config/src/toolchain-bun.test.ts
• packages/oxlint-config/src/toolchain-bun.ts
• packages/oxlint-config/src/toolchain-check.test.ts
• packages/oxlint-config/src/toolchain-guard.ts
• packages/oxlint-config/src/toolchain-packages.ts
• packages/oxlint-config/src/typecheck-parity.ts

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⏰ Context from checks skipped due to timeout: 6

• GitHub Check: cla / cla
• GitHub Check: Enforce package quarantine / Enforce package quarantine
• GitHub Check: Hawk compiler compatibility
• GitHub Check: Shared tooling checks
• GitHub Check: rust-lints
• GitHub Check: Generated setup with PostgreSQL and Valkey

🧰 Additional context used

📚 Code guidelines: 1

AGENTS.md — configured

📓 Path-based instructions: 1

Source excerpt: If TypeScript can make a class of bug structurally impossible (branded types, discriminated unions, exhaustive checks), prefer that over runtime validation or manual discipline Source excerpt: No enums: use `as const` object...

📄 CodeRabbit inference engine (AGENTS.md)

Files:

• packages/oxlint-config/src/toolchain-guard.ts
• packages/oxlint-config/src/toolchain-packages.ts
• packages/oxlint-config/src/typecheck-parity.ts
• packages/oxlint-config/src/toolchain-check.test.ts
• packages/oxlint-config/src/cloud-setup-cli.ts
• packages/oxlint-config/src/toolchain-bun.test.ts
• packages/oxlint-config/src/toolchain-bun.ts

🪛 OpenGrep (1.30.1)

packages/oxlint-config/src/toolchain-bun.ts

[ERROR] 19-19: A nonliteral argument is passed to exec/execSync. Identify the receiver: Node child_process methods execute shell commands, while regular-expression and database methods have different contracts. For shell execution, prefer execFile or spawn with an argument array.

(coderabbit.command-injection.exec-js)

🔇 Additional comments: 3

.changeset/bun-floor.md: 1

1-5: LGTM!

README.md: 1

44-44: LGTM!

packages/oxlint-config/README.md: 1

78-83: LGTM!