update: revert last change, rename `mergeHead` arguments for clarity.

src/shared/shared.ts

@@ -168,16 +168,18 @@ function hasTag(head: HeadConfig[], tag: HeadConfig) {
   )
 }
 
-// Merge head tags, overwrite duplicate meta tags in ascending precedence
-export function mergeHead(...heads: HeadConfig[][]) {
-  return heads
+export function mergeHead(incoming: HeadConfig[], ...current: HeadConfig[][]) {
+  return current
     .filter(Array.isArray)
     .flat(1)
     .reverse()
-    .reduce((merged, tag) => {
-      if (!hasTag(merged, tag)) merged.push(tag)
-      return merged
-    }, []) as HeadConfig[]
+    .reduce(
+      (merged, tag) => {
+        if (!hasTag(merged, tag)) merged.push(tag)
+        return merged
+      },
+      [...incoming]
+    )
 }
 
 // https://github.com/rollup/rollup/blob/fec513270c6ac350072425cc045db367656c623b/src/utils/sanitizeFileName.ts