fix(arborist): invalid filterNode crash under the linked strategy#9645
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) In continuation of our exploration of using `install-strategy=linked` in the [Gutenberg monorepo](WordPress/gutenberg#75814), which powers the WordPress Block Editor. Under `install-strategy=linked`, several common installs failed with `npm error invalid filterNode: outside idealTree/actualTree`, with no workaround besides dropping the linked strategy. Hoisted handled all of them. This fixes two distinct paths that both produced that error. ## Why A linked reify diffs the ideal tree against a synthesized actual wrapper (`#linkedActualForDiff`) rather than `this.actualTree`. `Diff.calculate` rejects any filter node whose root is neither the ideal nor the actual it was given, so a filter node taken from the real `this.actualTree` is "outside" the diff and throws. Two places fed it such nodes: - `--workspaces=false` and `-w <ws> --include-workspace-root` go through the `includeRootDeps` branch of `_diffTrees()`, which collected root-dep edge targets from both `this.idealTree` and `this.actualTree`. The actual-side targets are rooted at the real actual tree, not the wrapper, so they tripped the guard. The sibling `includeWorkspaces` branch already accounted for this; the root-dep branch did not. - A global install with a per-call `installStrategy: 'linked'` re-engaged the linked path even though the constructor normalizes global installs to `shallow` (the linked layout is unsupported for globals). Re-installing an already-present global package then hit the global explicit-request branch, which pushes actual-side nodes, and tripped the same guard. Suppressing the crash there was worse: the isolated reifier does not materialize the global layout and removed the package instead. ## How `_diffTrees()` now iterates only the ideal tree for root-dep filter nodes when the linked wrapper is in use, matching the existing workspace-node handling. The ideal-side nodes are sufficient to scope the diff, and the post-reify orphan sweep continues to prune deps removed from the manifest. `reify()` now honors the constructor's global-to-shallow normalization when deriving the `linked` flag, so a global install never engages the linked path regardless of a per-call `installStrategy`. Global installs fall back to shallow, which materializes and upgrades packages correctly. No change to the global explicit-request branch is needed once global is never linked. ## References Fixes #9614 Part of #9608 (cherry picked from commit 2b976b5)
owlstronaut
approved these changes
Jun 24, 2026
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Backport of #9637 to
release/v11.