diff --git a/src/index.ts b/src/index.ts
index ae4908b..79a4b20 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -123,10 +123,8 @@ function processFile(content: string): Promise<Report> {
   });
 }
 
-interface Reports {
-  [key: string]: Report;
-}
-let reports: Reports = {};
+type Reports = Map<string, Report>;
+let reports: Reports = new Map();
 async function recurseDirectory(reports: Reports, path: string) {
   const dir = await readdir(path, { withFileTypes: true });
   return await Promise.all(
@@ -136,7 +134,7 @@ async function recurseDirectory(reports: Reports, path: string) {
       else {
         if (!file.name.endsWith(".html")) return;
         const content = await readFile(filePath, "utf-8");
-        reports[filePath] = await processFile(content);
+        reports.set(filePath, await processFile(content));
       }
     })
   );