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src/types/typeUtils.ts

@@ -2,10 +2,14 @@ export type StringMap<T> = {
   [key: string]: T;
 };
 
+export type NumberMap<T> = {
+  [key: number]: T;
+};
+
 export function narrow<T>(s: T, defd: T, ...allowed: T[]): T {
-    if (allowed.includes(s) || s == defd) {
-        return s;
-    } else {
-        return defd;
-    }
-}
+  if (allowed.includes(s) || s == defd) {
+    return s;
+  } else {
+    return defd;
+  }
+}