Update: not invoke getRootDir in some specific case

packages/core/core/src/resolveOptions.js

@@ -50,22 +50,18 @@ export default async function resolveOptions(
     entries = [path.resolve(inputCwd, initialOptions.entries)];
   }
 
-  let shouldMakeEntryReferFolder = false;
-  // if entries have the only one entry and the one is not glob and refers to directory, we need to make the entry refer to some file.
+  let entriesRefersEntryRoot = false;
+  // if entries have the only one entry and the one is not glob and refers to directory, entries already refers to entry root directory
   if (entries.length === 1 && !isGlob(entries[0])) {
     let [entry] = entries;
     try {
-      shouldMakeEntryReferFolder = (await inputFS.stat(entry)).isDirectory();
+      entriesRefersEntryRoot = (await inputFS.stat(entry)).isDirectory();
     } catch {
       // ignore failing stat call
     }
   }
 
-  // getRootDir treats the input as files, so getRootDir(["/home/user/myproject"]) returns "/home/user".
-  // Instead we need to make the the entry refer to some file inside the specified folders if entries refers to the directory.
-  let entryRoot = getRootDir(
-    shouldMakeEntryReferFolder ? [path.join(entries[0], 'index')] : entries,
-  );
+  let entryRoot = entriesRefersEntryRoot ? entries[0] : getRootDir(entries);
   let projectRootFile =
     (await resolveConfig(
       inputFS,