fix: externalize explicitly configured linked packages #9346
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Description
Follow up to:
After this PR, vite-plugin-ssr CI fails in vite-ecosystem-ci
When a package is explicitly configured as external, externalize it even if it is linked (it isn't in
node_modules
).This PR also checks if a package is resolvable before externalizing it. I think this is more consistent between direct package imports and imports of package entries.
The PR also avoids returning undefined when calling
tryNodeResolve
with theexternalize
flag. Instead, it returns the resolved object, and in the ssr logic, we check for itsexternal
flag.What is the purpose of this pull request?