[9.3] Fix Moon webpack dependency cache invalidation (#258940)#259477
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kibanamachine merged 1 commit intoelastic:9.3from Mar 25, 2026
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[9.3] Fix Moon webpack dependency cache invalidation (#258940)#259477kibanamachine merged 1 commit intoelastic:9.3from
kibanamachine merged 1 commit intoelastic:9.3from
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Moon cached webpack-built shared dependency bundles using only local source files and webpack config as inputs. When a dependency like `@elastic/eui` changed after bootstrap, Moon did not see any relevant input change for `@kbn/ui-shared-deps-npm`, so it could restore a stale cached bundle. That left the installed dependency tree newer than the built artifact, which is why code present under `node_modules/@elastic/eui` was missing from the emitted shared deps bundle. This change makes Moon invalidate those webpack bundle caches when, and only when, the actual resolved dependency graph for the bundle changes. Instead of keying off the entire workspace yarn.lock, it adds an exact transitive dependency fingerprint for each affected webpack-built package. That gives correct rebuilds for updated dependencies, including transitive ones, without broadly uncaching on unrelated lockfile churn. --------- Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co> (cherry picked from commit 41b1f04)
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