some simple tidy up

Author: nsdeschenes

packages/bundler-plugin-core/src/utils/normalizePath.ts

@@ -28,13 +28,10 @@ export const normalizePath = (path: string, format: string): string => {
       leadingDelimiter,
     )})`;
 
+    const closingBracketIndex = format.slice(match.hashIndex).indexOf("]");
     // grab the ending delimiter and create a regex group for it
-    let endingDelimiter = "";
-
-    endingDelimiter =
-      format.at(
-        match.hashIndex + format.slice(match.hashIndex).indexOf("]") + 1,
-      ) ?? "";
+    let endingDelimiter =
+      format.at(match.hashIndex + closingBracketIndex + 1) ?? "";
 
     // If the ending delimiter is `[extname]` there won't be a
     // `.<file-extension>` so we need to replace it with a `.` for the