fix: allow paths to asar archives to contain the .asar extension in directories (#20342)

lib/common/asar.js

@@ -40,8 +40,6 @@
     return newArchive
   }
 
-  const ASAR_EXTENSION = '.asar'
-
   // Separate asar package's path from full path.
   const splitPath = archivePathOrBuffer => {
     // Shortcut for disabled asar.
@@ -54,22 +52,7 @@
     }
     if (typeof archivePath !== 'string') return { isAsar: false }
 
-    if (archivePath.endsWith(ASAR_EXTENSION)) {
-      return { isAsar: true, asarPath: archivePath, filePath: '' }
-    }
-
-    archivePath = path.normalize(archivePath)
-    const index = archivePath.lastIndexOf(`${ASAR_EXTENSION}${path.sep}`)
-    if (index === -1) return { isAsar: false }
-
-    // E.g. for "//some/path/to/archive.asar/then/internal.file"...
-    return {
-      isAsar: true,
-      // "//some/path/to/archive.asar"
-      asarPath: archivePath.substr(0, index + ASAR_EXTENSION.length),
-      // "then/internal.file" (with a path separator excluded)
-      filePath: archivePath.substr(index + ASAR_EXTENSION.length + 1)
-    }
+    return asar.splitPath(path.normalize(archivePath))
   }
 
   // Convert asar archive's Stats object to fs's Stats object.