In continuation of our exploration of using install-strategy=linked in the Gutenberg monorepo, which powers the WordPress Block Editor.

In linked strategy, npm query ':root > *' returns transitive deps and bare store directory nodes as direct children of root.

The hasParent function treats any isTop node whose resolveParent is root as a direct child. In linked mode, all store nodes are isTop and resolve to root via fsParent, so they all match incorrectly.

The fix tightens this check to only match if the node has a link in linksIn whose parent is the compare node — i.e., there's an actual symlink in the parent's node_modules/.

References

Fixes #9093