Revised Comments

src/data/abilities/ability.ts

@@ -3911,6 +3911,7 @@ export class PostSummonTransformAbAttr extends PostSummonAbAttr {
     const target = this.getTarget(targets);
     const user = pokemon;
 
+    //Prevents Imposter from triggering on a transformed target or if the user is already transformed
     if (user?.getTag(BattlerTagType.TRANSFORM) || target?.getTag(BattlerTagType.TRANSFORM)) {
       return false;
     }

src/phases/move-phase.ts

@@ -340,6 +340,7 @@ export class MovePhase extends BattlePhase {
     }
 
     if (
+      //Prevent using Transform if either the user or target is already transformed
       this.move.getMove().id === MoveId.TRANSFORM &&
       (targets[0].getTag(BattlerTagType.TRANSFORM) || this.pokemon.getTag(BattlerTagType.TRANSFORM))
     ) {