diff --git a/lib/util/defaultmap.js b/lib/util/defaultmap.js
deleted file mode 100644
index e863962..0000000
--- a/lib/util/defaultmap.js
+++ /dev/null
@@ -1,18 +0,0 @@
-
-// export class DefaultMap {
-//   constructor(defaultValue, ...rest) {
-//     this.defaultValue = defaultValue;
-//     this.m = new Map(rest);
-//   }
-//   getdefault(key, addToMapping = false) {
-//     return this.m.get(key) || (() => {
-//       const val = this.defaultValue(key);
-//       if (addToMapping)
-//         this.m.set(key, val);
-//       return val;
-//     })();
-//   }
-//   entries() {
-//     return this.m.entries();
-//   }
-// }