CODEBASE: Expand lint rules, and Aliases are stored as maps (#501)

src/Infiltration/ui/Difficulty.ts

@@ -1,6 +1,4 @@
-interface DifficultySetting {
-  [key: string]: number;
-}
+type DifficultySetting = Record<string, number>;
 
 interface DifficultySettings {
   Trivial: DifficultySetting;

src/Infiltration/ui/Victory.tsx

@@ -48,7 +48,7 @@ export function Victory(props: IProps): React.ReactElement {
     quitInfiltration();
   }
 
-  function changeDropdown(event: SelectChangeEvent<string>): void {
+  function changeDropdown(event: SelectChangeEvent): void {
     setFaction(event.target.value);
   }