install: self-contained workspaces for the hoisted linker (`installConfig.hoistingLimits` / `install.selfContainedWorkspaces`) by MarshallOfSound · Pull Request #39908 · oven-sh/bun

MarshallOfSound · 2026-08-21T08:35:49Z

What does this PR do?

Adds a way to make one workspace's node_modules complete and physical when using the hoisted linker, for workspaces that are packaged by tools which walk node_modules themselves — Electron packagers (which copy/prune the app's node_modules into the bundle) and serverless/function bundlers are the common cases. With hoisting, most of such a workspace's dependencies live in the root node_modules, so those tools either miss them or have to be pointed at the repo root.

A workspace opts in either with Yarn's existing setting in its own manifest (so projects migrating from Yarn need no changes):

{ "name": "desktop", "installConfig": { "hoistingLimits": "workspaces" } }

or from the root bunfig.toml:

[install]
selfContainedWorkspaces = ["apps/desktop"]   # workspace paths or names

For that workspace bun install then:

Treats it as a hoisting barrier. In Tree::process_subtree, the subtree created for a self-contained workspace becomes its own hoist_root_id — the mechanism bundled dependencies already use — so nothing it depends on, directly or transitively (including via other workspaces it depends on, which stay symlinks), is placed above <workspace>/node_modules. Versions still dedupe within that subtree.
Materializes real files there. The hoisted PackageInstaller uses the copyfile backend for trees owned by a self-contained workspace instead of hardlink/clonefile from the cache, so packagers/rebuilders that rewrite files in place cannot reach the shared cache or other projects.

Everything else — other workspaces, the root, and the isolated linker (where the setting is meaningless) — behaves exactly as before. PackageManager::try_get() is added for the small lockfile helper that reads the option.

Docs: docs/pm/workspaces.mdx (new "Self-contained workspaces" section), docs/runtime/bunfig.mdx (install.selfContainedWorkspaces).

How did you verify your code works?

New test/cli/install/bun-workspaces-self-contained.test.ts (dummy registry, hoisted linker), for both the installConfig and the bunfig.toml spelling: a monorepo with apps/desktop (self-contained; depends on a registry package with a transitive dep, and on a sibling workspace with its own dep), apps/web, and packages/shared. Asserts that apps/desktop/node_modules contains the direct dep, its transitive dep, the workspace symlink and that workspace's dep; that those files have a link count of 1 while the same package at the root is still hardlinked; that apps/web's deps still hoist to the root; that a --frozen-lockfile re-install is stable; and that without either setting the layout is the normal hoisted one. Also ran bun-workspaces, bun-install, isolated-install and bun-install-registry locally.

… the hoisted linker Tools that walk, prune or repackage one workspace's node_modules (Electron packagers, serverless bundlers) need every dependency physically present under that workspace, which hoisting to the root breaks. A workspace can now be marked self-contained, either with Yarn's `"installConfig": { "hoistingLimits": "workspaces" }` in its own package.json or via `install.selfContainedWorkspaces = ["apps/desktop"]` in bunfig.toml (paths or names). For such a workspace the tree builder makes it a hoist root (the same hoist_root_id mechanism bundled dependencies already use), so nothing it transitively depends on — including through workspaces it depends on — is placed above <workspace>/node_modules; and the hoisted installer materializes the packages under it with the copyfile backend (real files) instead of hardlinks/clonefile from the cache, so rewriting them cannot affect the cache. Other workspaces, and the isolated linker, are unchanged. Adds PackageManager::try_get() for the lockfile helper that consults the option outside an install.

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coderabbitai · 2026-08-21T19:39:02Z

Walkthrough

Changes

Self-contained workspace support accepts workspace paths or names, creates hoisting boundaries, copies packages physically, and documents the configuration. Tests cover package-level and root-level settings, frozen reinstalls, and default hoisting.

Changes

Self-contained workspace installation

Layer / File(s)	Summary
Configuration and option propagation `src/options_types/schema.rs`, `src/bunfig/bunfig.rs`, `src/install/PackageManager/...`	Adds `install.selfContainedWorkspaces` to the schema, bunfig parser, and effective install options.
Workspace detection and hoisting boundaries `src/install/lockfile.rs`, `src/install/lockfile/Tree.rs`, `src/install/lockfile/Package/...`	Identifies configured or package-level self-contained workspaces and prevents dependencies from hoisting above their workspace boundaries.
Physical package materialization `src/install/hoisted_install.rs`, `src/install/PackageInstaller.rs`	Marks self-contained workspace trees and installs their packages with `Copyfile`.
Documentation and installation coverage `docs/pm/workspaces.mdx`, `docs/runtime/bunfig.mdx`, `test/cli/install/bun-workspaces-self-contained.test.ts`	Documents both configuration mechanisms and tests physical copies, hoisting, frozen reinstalls, and default behavior.

Merge Risk: 🟡 Moderate · up to afb2e

This change alters hoisted workspace layout and file materialization for opt-in workspaces, but unresolved correctness issues in configuration lookup and workspace metadata handling could cause the setting to be ignored or produce incomplete workspace state. The PR is not merge-ready until those bounded issues are fixed or explicitly accepted.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes support for self-contained workspaces and identifies both configuration methods.
Description check	✅ Passed	The description includes both required sections and clearly explains the implementation, configuration options, behavior, documentation, and verification.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 5

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⚠️ Outside diff range comments (1)

src/install/PackageManager/PackageManagerOptions.rs (1)
733-744: 📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Add a SAFETY comment to the new unsafe block in try_get().

try_get() derefs p inside unsafe { &*p } at line 741 with no safety comment. The sibling get() function right above it documents why its equivalent deref is sound. Static analysis flags the missing comment on try_get(). Add the same justification (the pointer is written once before any caller and the pointee outlives the process) so the invariant is documented at the new call site too.
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In `@src/install/PackageManager/PackageManagerOptions.rs` around lines 733 - 744,
Add a SAFETY comment at the unsafe dereference in try_get(), matching the
justification used by the sibling get() function: p is initialized before any
caller accesses it, and its pointee remains valid for the process lifetime.
Source: Linters/SAST tools

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Inline comments:
In `@src/install/lockfile.rs`:
- Around line 817-857: Cache the result of self_contained_workspace_ids() for
the duration of an install and reuse it across hoist() and the
hoisted_install.rs copy_trees path. Ensure each workspace package.json fallback
is read at most once per install, including when resolve() invokes hoist()
repeatedly, while preserving the existing configured and Yarn hoistingLimits
detection behavior.
- Around line 842-844: Update the file-reading branch around the unsafe UTF-8
conversion to use the project’s bun_sys File::openat and read_to_end pattern,
passing p.slice() directly where supported instead of converting it to a string;
if the conversion remains necessary, add a safety comment that establishes its
UTF-8 invariant. Preserve the existing successful-read handling and error
behavior.
- Around line 845-849: Replace the byte-window scan around
installConfig.hoistingLimits with structured parsing via
ParsedJson::parse_package_json, using Expr::get and as_string to read the value.
Read the lockfile through bun_sys::File and avoid unchecked UTF-8 conversion.
Preserve distinct Yarn semantics for "dependencies" versus "workspaces"; if both
intentionally map to the same self-contained behavior, document that contract
and add regression coverage.

In `@test/cli/install/bun-workspaces-self-contained.test.ts`:
- Around line 100-106: Update the test around install(package_dir) to store its
result, assert the result’s err value before checking code, then retain the
existing code and filesystem assertions; follow the assertion ordering used by
the other tests in this file.
- Around line 66-69: Add a third parameterized case in the test loop covering
installConfig.hoistingLimits set to "dependencies", using the same expected
self-contained workspace behavior as the existing "workspaces" case.

---

Outside diff comments:
In `@src/install/PackageManager/PackageManagerOptions.rs`:
- Around line 733-744: Add a SAFETY comment at the unsafe dereference in
try_get(), matching the justification used by the sibling get() function: p is
initialized before any caller accesses it, and its pointee remains valid for the
process lifetime.

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📒 Files selected for processing (11)

docs/pm/workspaces.mdx
docs/runtime/bunfig.mdx
src/bunfig/bunfig.rs
src/install/PackageInstaller.rs
src/install/PackageManager.rs
src/install/PackageManager/PackageManagerOptions.rs
src/install/hoisted_install.rs
src/install/lockfile.rs
src/install/lockfile/Tree.rs
src/options_types/schema.rs
test/cli/install/bun-workspaces-self-contained.test.ts

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Inline comments:
In `@test/cli/install/bun-workspaces-self-contained.test.ts`:
- Around line 84-89: Replace the parameterized for-of test loop with
describe.each(), preserving the existing configuration tuples as its test cases
and keeping the current test behavior unchanged.

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docs/pm/workspaces.mdx
test/cli/install/bun-workspaces-self-contained.test.ts

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…instead of re-reading manifests; only "workspaces" is recognized; clippy; test tweaks * WorkspaceMap::Entry carries hoisting_limits (read where the workspace package.json is already parsed); Lockfile.self_contained_workspaces (name hashes, not serialized) is filled from it and carried through the diff and clean passes, so hoisting no longer touches the filesystem. * Only hoistingLimits: "workspaces" enables it — "dependencies" has different semantics in Yarn and is not claimed here. * try_get(): SAFETY comment; no std::fs. * test: describe.each, assert stderr before exit code.

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src/install/PackageManager.rs (1)
736-744: 🩺 Stability & Availability | 🟠 Major | ⚡ Quick win

Guard try_get() with INITIALIZED before loading RAW_PTR.

allocate_package_manager() publishes RAW_PTR while PackageManager is uninitialized. A reentrant call can observe the non-null pointer and create an invalid reference. Return None when INITIALIZED.load(Acquire) is false. Keep the Release store after all field writes.
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.

In `@src/install/PackageManager.rs` around lines 736 - 744, Update
PackageManager::try_get to first check INITIALIZED with Acquire ordering and
return None when initialization has not completed, before calling get or loading
RAW_PTR. Preserve the existing non-null pointer handling and keep the
INITIALIZED Release store after all PackageManager field writes.

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Inline comments:
In `@src/install/lockfile/Package.rs`:
- Around line 2914-2918: Keep self-contained workspace metadata synchronized
independently of dependency changes: in src/install/lockfile/Package.rs lines
2914-2918, update Lockfile::self_contained_workspaces from entry.hoisting_limits
immediately after parse_dependency succeeds and before handling an optional
dependency result; in src/install/PackageManager/install_with_manager.rs lines
420-426, move active lockfile map synchronization outside the had_any_diffs
branch so it also runs when no dependency changes occur.

In `@src/install/lockfile/Package/WorkspaceMap.rs`:
- Around line 162-172: Update the hoistingLimits extraction in the WorkspaceMap
construction to distinguish invalid or missing strings from allocation failures:
replace the error-swallowing handling around as_string_cloned with logic that
returns false for absent/non-string values while propagating AllocError via ?.
Preserve the existing comparison to the workspaces value and unwrap_or(false)
behavior for non-errors.

---

Outside diff comments:
In `@src/install/PackageManager.rs`:
- Around line 736-744: Update PackageManager::try_get to first check INITIALIZED
with Acquire ordering and return None when initialization has not completed,
before calling get or loading RAW_PTR. Preserve the existing non-null pointer
handling and keep the INITIALIZED Release store after all PackageManager field
writes.

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src/install/PackageManager.rs
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src/install/lockfile.rs
src/install/lockfile/Package.rs
src/install/lockfile/Package/WorkspaceMap.rs
test/cli/install/bun-workspaces-self-contained.test.ts

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test/cli/install/bun-workspaces-self-contained.test.ts (1)
84-120: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Expand the test matrix for the documented contract.

The selfContainedWorkspaces option accepts workspace paths or names. Add a case that uses "desktop" instead of "apps/desktop".
The documentation also states that the setting has no effect with the isolated linker. Add an isolated-linker case to protect that behavior.

As per coding guidelines: tests must cover the complete relevant variant matrix, including alternate modes. The documented contract appears in docs/pm/workspaces.mdx Lines [118] and [126], and src/options_types/schema.rs Lines [206]-[265].

Also applies to: 122-130
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In `@test/cli/install/bun-workspaces-self-contained.test.ts` around lines 84 -
120, The self-contained workspace test matrix must cover both accepted workspace
identifiers and linker behavior. Extend the describe.each cases around
“self-contained workspace via %s” with a `"desktop"` selfContainedWorkspaces
entry and an isolated-linker case asserting the option has no effect, while
preserving the existing hoisted-linker expectations and repeat-install checks.
Source: Coding guidelines

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Outside diff comments:
In `@test/cli/install/bun-workspaces-self-contained.test.ts`:
- Around line 84-120: The self-contained workspace test matrix must cover both
accepted workspace identifiers and linker behavior. Extend the describe.each
cases around “self-contained workspace via %s” with a `"desktop"`
selfContainedWorkspaces entry and an isolated-linker case asserting the option
has no effect, while preserving the existing hoisted-linker expectations and
repeat-install checks.

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MarshallOfSound · 2026-08-21T22:17:50Z

Superseded by #40014 — same branch, now pushed to oven-sh/bun directly. All review feedback from this PR has been carried over there.

…s.selfContained` / `installConfig.hoistingLimits`) (#40014) ### What does this PR do? Adds a way to make one workspace's `node_modules` **complete and physical** when using the hoisted linker, for workspaces that are packaged by tools which walk `node_modules` themselves — Electron packagers (which copy/prune the app's `node_modules` into the bundle) and serverless/function bundlers are the common cases. With hoisting, most of such a workspace's dependencies live in the *root* `node_modules`, so those tools either miss them or have to be pointed at the repo root. A workspace opts in either with Yarn's existing setting in its own manifest (so projects migrating from Yarn need no changes): ```json { "name": "desktop", "installConfig": { "hoistingLimits": "workspaces" } } ``` or from the root `package.json`, inside the `workspaces` object: ```json { "workspaces": { "packages": ["apps/*", "packages/*"], "selfContained": ["apps/desktop"] } } ``` (entries are workspace paths or package names). For that workspace `bun install` then: 1. **Treats it as a hoisting barrier.** In `Tree::process_subtree`, the subtree created for a self-contained workspace becomes its own `hoist_root_id` — the mechanism bundled dependencies already use — so nothing it depends on, directly or transitively (including via other workspaces it depends on, which stay symlinks), is placed above `<workspace>/node_modules`. Versions still dedupe *within* that subtree. 2. **Materializes real files there.** The hoisted `PackageInstaller` uses the `copyfile` backend for trees owned by a self-contained workspace instead of hardlink/clonefile from the cache, so packagers/rebuilders that rewrite files in place cannot reach the shared cache or other projects. Everything else — other workspaces, the root, and the isolated linker (where the setting is meaningless) — behaves exactly as before. The flag is recorded per workspace in `bun.lock` (`"hoistingLimits": "workspaces"`) so a tree rebuilt from the lockfile is hoisted the same way. Docs: `docs/pm/workspaces.mdx` (new "Self-contained workspaces" section). ### How did you verify your code works? New `test/cli/install/bun-workspaces-self-contained.test.ts` (dummy registry, hoisted linker), for both the `installConfig` and the `workspaces.selfContained` spelling: a monorepo with `apps/desktop` (self-contained; depends on a registry package with a transitive dep, and on a sibling workspace with its own dep), `apps/web`, and `packages/shared`. Asserts that `apps/desktop/node_modules` contains the direct dep, its transitive dep, the workspace symlink and that workspace's dep; that those files have a link count of 1 while the same package at the root is still hardlinked; that `apps/web`'s deps still hoist to the root; that a `--frozen-lockfile` re-install is stable; and that without either setting the layout is the normal hoisted one. Also ran `bun-workspaces`, `bun-install`, `isolated-install` and `bun-install-registry` locally. Supersedes #39908 (same change, moved from a fork branch to a branch in this repository; the review discussion so far is on that PR and has been addressed here). --------- Co-authored-by: Samuel Attard <6634592+MarshallOfSound@users.noreply.github.com> Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

### Problem - GitHub closes only the first reference after a keyword, so "Fixes #1, #2" leaves #2 open. "Supersedes #3" links nothing, and no reference closes a pull request. - The last 1000 merged PRs name 274 such references. PR #32292 is open although merged #36135 says "Supersedes #32292". ### Fix - `.github/workflows/close-linked-issues.yml` runs on `pull_request_target` `closed` (a merge into the default branch of `oven-sh/bun`) and on `workflow_dispatch` with a PR number and `dry_run`. Everything is inline in one `actions/github-script` step, with no checkout. - Each open target is closed as `completed` with the comment "Closed as completed by #N." or "Superseded by #N.". Closed or missing targets, the PR itself and other repositories are skipped. - The parser has no regex. A closing keyword (close, fix, resolve, supersede, replace, any tense) must lead the reference, alone or in a list. A negated, hedged or noun keyword, or one whose subject is another reference, does not count ("may fix", "the rm fix #1", "#100 supersedes #1"). - Verified: `test/internal/close-linked-issues.test.ts` (333 cases) runs the YAML's script against fake `github`, `context` and `core`. Also the 1000-PR parse (Notes). ### Background - GitHub's own keywords are close, fix and resolve (-s, -ed). Each links one reference, and only a merge into the default branch closes it. - `pull_request_target` runs in the base repository with a write token, also for fork PRs. That is safe only when no PR-controlled code runs. Here the description is the only PR input, parsed as text. <details><summary>Notes</summary> A close through the API does not create the "closed this in #N" timeline link that GitHub makes for its own closes. The comment carries the PR number instead. How the parser was calibrated. I pulled the descriptions of the last 1000 merged PRs and listed every line with a keyword next to a reference. The keyword families, list shapes and reference forms in the script are the ones that appear there. A reference is `#1`, `owner/repo#1`, an issue or pull URL (bare or in `<>`), or a markdown link. Four lines would have been wrong with a plain keyword-then-reference rule, and each led to a rule: - "the open `rm` fix #37521" (#38379): "fix" as a noun. Base forms (fix, close, resolve, supersede, replace) count only at the start of a sentence or line, or after will, should, does, and, and a few similar words. "to" is not one of them ("unable to fix #1", "how to fix #1"). - "May also fix #12318 / #10046, untested" (#38242): hedged. may, might, could, would, partially and the negations disqualify the keyword, looking past adverbs such as "also". - "Supersedes the closed #26040" (#36289) and "a comment on closed #35351" (#35365): "closed" as an adjective. A determiner or preposition before the keyword disqualifies it. - "supersedes #33130's optimisation" (#35843): a number that continues into a word is not a reference. Review added: a reference before the keyword is the subject ("#100 supersedes #1"), also through "which" or "that" ("reverts #100, which fixed #1") and across a removed span ("#100 ~~also~~ fixes #1"). A hedge two words before the keyword disqualifies it ("hopefully this fixes #1", "could this fix #1?"). A clause that starts with if, when, once, until or unless is not a statement. The tokenizer keeps a line break as a token so that "Fixes #1" on one line and "Fixes #2" on the next stay two statements. Code spans, fences, indented code, blockquotes, HTML comments and strikethrough are skipped. The block stripping follows CommonMark for fences (also inside a blockquote), indented code, blockquotes with lazy continuation, setext underlines and HTML comments, and GFM for `~~` flanking. Result over the 1000 descriptions: 274 distinct references in 135 PRs. I checked the current state of all of them through GraphQL. All but one are closed (202 issues completed, 5 duplicates, 66 pull requests). The one open target is PR #32292, superseded by merged #36135. No open target is a false positive. Every review change kept this result. Patterns that are deliberately not handled: a bulleted list under "Closes:" on its own line (not seen in the sample), references separated by whitespace only ("#1 #2"), "fix for #1", and GH-1 style references. A `?` after the list is not treated as a question. The block parser tracks no list containers, so a second paragraph of a list item indented by four spaces is read as an indented code block and skipped. A removed span or inline comment reads as one word, so "Fixes  #1" finds nothing. The test suite covers: the phrases above, stopping at the right place in real sentences, CRLF descriptions, URLs with fragments or a `/files` suffix, case-insensitive `Owner/Repo#1`, the fake API where a lookup, an update or a comment fails, the `dry_run` input, an invalid `pr_number` input, an unmerged PR, a PR merged into a non-default branch, the merge event body against a later edit, and a description with no closing statement. The first revision of this PR checked out the repository and ran `scripts/close-linked-issues.ts`. Jarred asked for no checkout and no script file, so the script moved inline into the workflow and the test now reads it out of the YAML. </details>  --- **[stamp-90s]** gate passed · iteration 9 · 2 files touched <details><summary>passes on PR (with fix)</summary> ```console Test-only change. Debug/ASAN (expected pass): $ bun bd test 'test/internal/close-linked-issues.test.ts' $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test test/internal/close-linked-issues.test.ts bun test v1.4.1 (4448a2e) test/internal/close-linked-issues.test.ts: (pass) finds "Fixes #39852" [176.21ms] (pass) finds "Closes #31772. Fixes #31771." [22.28ms] (pass) finds "- Fixes #39930" [12.28ms] (pass) finds "Fixes: #30429" [10.46ms] (pass) finds "FIXES #1" [7.86ms] (pass) finds "(Fixes #1)" [8.97ms] (pass) finds "**Fixes #1**" [10.20ms] (pass) finds "__Fixes #1__" [9.83ms] (pass) finds "_Fixes #1_" [11.25ms] (pass) finds "Fixes **#1**" [9.72ms] (pass) finds "**Fixes** #1" [7.13ms] (pass) finds "**Fixes:** #1" [8.11ms] (pass) finds "Fixes #1 and **#2**" [11.47ms] (pass) finds "Fixes **#1**, **#2**" [9.13ms] (pass) finds "## Why (fixes #13771, closes #30543)" [16.08ms] (pass) finds "Closes #11418" [19.46ms] (pass) finds "Resolves #1. Resolved #2. Resolve #3." [12.09ms] (pass) finds "Fixes #34055, #30327, #24394, #20816, #32403, #11898, #10056." [17.11ms] (pass) finds "Fixes #18192 and #31675 as a consequence" [10.45ms] (pass) finds "Fixes #1, #2, and #3" [10.96ms] (pass) finds "Fixes #1 & #2" [7.63ms] (pass) finds "Closes #33280, Closes #32864 and Closes #29696 (the timer in #32949 is orthogonal)" [20.29ms] (pass) finds "Closes #33182 and #32947 on top of current main (which already has #36304 for catalogs)." [16.12ms] (pass) finds "Fixes #1,\n#2" [7.76ms] (pass) finds "Fixes #1, #2,\nand #3" [9.27ms] (pass) finds "Fixes #1\nand #2" [8.57ms] (pass) finds "Fixes #1\n& #2" [6.80ms] (pass) finds "Fixes #1 and\n#2" [7.31ms] (pass) finds "Supersedes #39908 (same change, moved from a fork branch)" [13.21ms] (pass) finds "Supersedes #38778 and #38391. Carries the entry point arm of #35053." [14.43ms] (pass) finds "Supersedes #39193 and keeps its three tests." [11.48ms] (pass) finds "This supersedes #33306 and #32803. Their tests are kept here." [13.73ms] (pass) finds "- This replaces #33793. Its ... (truncated) Exit: 0 ``` </details> <details><summary>diff hotspot</summary> ``` .github/workflows/close-linked-issues.yml | 950 ++++++++++++++++++++++++++++++ test/internal/close-linked-issues.test.ts | 598 +++++++++++++++++++ 2 files changed, 1548 insertions(+) ``` </details> **gate history** · 29 passed · 0 rejected · iteration 9 <details><summary>evidence per changed file</summary> ``` file reads edits tests .github/workflows/close-linked-issues.yml 6 12 0 test/internal/close-linked-issues.test.ts 3 11 0 ``` </details>

MarshallOfSound marked this pull request as ready for review August 21, 2026 19:26

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MarshallOfSound force-pushed the install-self-contained-workspaces branch from 2c34a56 to 6fa7ed0 Compare August 21, 2026 20:25

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MarshallOfSound mentioned this pull request Aug 21, 2026

install: self-contained workspaces for the hoisted linker (workspaces.selfContained / installConfig.hoistingLimits) #40014

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install: self-contained workspaces for the hoisted linker (`installConfig.hoistingLimits` / `install.selfContainedWorkspaces`) - #39908

install: self-contained workspaces for the hoisted linker (`installConfig.hoistingLimits` / `install.selfContainedWorkspaces`)#39908
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