diff --git a/src/data/ability.ts b/src/data/ability.ts
index 041d90ac4c0b..a698831a1eb0 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -123,6 +123,7 @@ export class Ability implements Localizable {
 type AbAttrApplyFunc<TAttr extends AbAttr> = (attr: TAttr, passive: boolean) => boolean | Promise<boolean>;
 type AbAttrCondition = (pokemon: Pokemon) => boolean;
 
+// TODO: Can this be improved?
 type PokemonAttackCondition = (user: Pokemon | null, target: Pokemon | null, move: Move) => boolean;
 type PokemonDefendCondition = (target: Pokemon, user: Pokemon, move: Move) => boolean;
 type PokemonStatStageChangeCondition = (target: Pokemon, statsChanged: BattleStat[], stages: number) => boolean;
@@ -2432,7 +2433,7 @@ export class PostSummonTransformAbAttr extends PostSummonAbAttr {
       pokemon.setStatStage(s, target.getStatStage(s));
     }
 
-    pokemon.summonData.moveset = target.getMoveset().map(m => new PokemonMove(m!.moveId, m!.ppUsed, m!.ppUp)); // TODO: are those bangs correct?
+    pokemon.summonData.moveset = target.getMoveset().map(m => new PokemonMove(m?.moveId ?? Moves.NONE, m?.ppUsed, m?.ppUp));
     pokemon.summonData.types = target.getTypes();
 
 
@@ -3152,12 +3153,12 @@ export class ForewarnAbAttr extends PostSummonAbAttr {
         } else if (move?.getMove().power === -1) {
           movePower = 80;
         } else {
-          movePower = move!.getMove().power; // TODO: is this bang correct?
+          movePower = move?.getMove().power ?? 0;
         }
 
         if (movePower > maxPowerSeen) {
           maxPowerSeen = movePower;
-          maxMove = move!.getName(); // TODO: is this bang correct?
+          maxMove = move?.getName() ?? "";
         }
       }
     }
@@ -5175,8 +5176,7 @@ export function initAbilities() {
       .attr(IgnoreOpponentStatStagesAbAttr)
       .ignorable(),
     new Ability(Abilities.TINTED_LENS, 4)
-      //@ts-ignore
-      .attr(DamageBoostAbAttr, 2, (user, target, move) => target?.getMoveEffectiveness(user, move) <= 0.5), // TODO: fix TS issues
+      .attr(DamageBoostAbAttr, 2, (user, target, move) => (target?.getMoveEffectiveness(user!, move) ?? 1) <= 0.5),
     new Ability(Abilities.FILTER, 4)
       .attr(ReceivedMoveDamageMultiplierAbAttr, (target, user, move) => target.getMoveEffectiveness(user, move) >= 2, 0.75)
       .ignorable(),
@@ -5294,8 +5294,9 @@ export function initAbilities() {
       .attr(WonderSkinAbAttr)
       .ignorable(),
     new Ability(Abilities.ANALYTIC, 5)
-    //@ts-ignore
-      .attr(MovePowerBoostAbAttr, (user, target, move) => !!target?.getLastXMoves(1).find(m => m.turn === target?.scene.currentBattle.turn) || user.scene.currentBattle.turnCommands[target.getBattlerIndex()].command !== Command.FIGHT, 1.3), // TODO fix TS issues
+      .attr(MovePowerBoostAbAttr, (user, target, move) =>
+        !!target?.getLastXMoves(1).find(m => m.turn === target?.scene.currentBattle.turn)
+        || user?.scene.currentBattle.turnCommands[target?.getBattlerIndex() ?? BattlerIndex.ATTACKER]?.command !== Command.FIGHT, 1.3),
     new Ability(Abilities.ILLUSION, 5)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
@@ -5460,8 +5461,7 @@ export function initAbilities() {
       .bypassFaint()
       .partial(),
     new Ability(Abilities.STAKEOUT, 7)
-      //@ts-ignore
-      .attr(MovePowerBoostAbAttr, (user, target, move) => user.scene.currentBattle.turnCommands[target.getBattlerIndex()].command === Command.POKEMON, 2), // TODO: fix TS issues
+      .attr(MovePowerBoostAbAttr, (user, target, move) => user?.scene.currentBattle.turnCommands[target?.getBattlerIndex() ?? BattlerIndex.ATTACKER]?.command === Command.POKEMON, 2),
     new Ability(Abilities.WATER_BUBBLE, 7)
       .attr(ReceivedTypeDamageMultiplierAbAttr, Type.FIRE, 0.5)
       .attr(MoveTypePowerBoostAbAttr, Type.WATER, 2)
@@ -5599,8 +5599,7 @@ export function initAbilities() {
     new Ability(Abilities.PRISM_ARMOR, 7)
       .attr(ReceivedMoveDamageMultiplierAbAttr, (target, user, move) => target.getMoveEffectiveness(user, move) >= 2, 0.75),
     new Ability(Abilities.NEUROFORCE, 7)
-      //@ts-ignore
-      .attr(MovePowerBoostAbAttr, (user, target, move) => target?.getMoveEffectiveness(user, move) >= 2, 1.25), // TODO: fix TS issues
+      .attr(MovePowerBoostAbAttr, (user, target, move) => (target?.getMoveEffectiveness(user!, move) ?? 1) >= 2, 1.25),
     new Ability(Abilities.INTREPID_SWORD, 8)
       .attr(PostSummonStatStageChangeAbAttr, [ Stat.ATK ], 1, true)
       .condition(getOncePerBattleCondition(Abilities.INTREPID_SWORD)),
@@ -5698,10 +5697,8 @@ export function initAbilities() {
       .attr(UserFieldStatusEffectImmunityAbAttr, StatusEffect.POISON, StatusEffect.TOXIC)
       .ignorable(),
     new Ability(Abilities.HUNGER_SWITCH, 8)
-      //@ts-ignore
-      .attr(PostTurnFormChangeAbAttr, p => p.getFormKey ? 0 : 1) // TODO: fix ts-ignore
-      //@ts-ignore
-      .attr(PostTurnFormChangeAbAttr, p => p.getFormKey ? 1 : 0) // TODO: fix ts-ignore
+      .attr(PostTurnFormChangeAbAttr, p => p.getFormKey() ? 0 : 1)
+      .attr(PostTurnFormChangeAbAttr, p => p.getFormKey() ? 1 : 0)
       .attr(UncopiableAbilityAbAttr)
       .attr(UnswappableAbilityAbAttr)
       .attr(NoTransformAbilityAbAttr)
diff --git a/src/data/pokemon-forms.ts b/src/data/pokemon-forms.ts
index a904f497b0f7..5c2dd06f7b3b 100644
--- a/src/data/pokemon-forms.ts
+++ b/src/data/pokemon-forms.ts
@@ -4,7 +4,7 @@ import { SpeciesFormKey } from "./pokemon-species";
 import { StatusEffect } from "./status-effect";
 import { MoveCategory, allMoves } from "./move";
 import { Type } from "./type";
-import { Constructor } from "#app/utils";
+import { Constructor, nil } from "#app/utils";
 import { Abilities } from "#enums/abilities";
 import { Moves } from "#enums/moves";
 import { Species } from "#enums/species";
@@ -185,7 +185,7 @@ export class SpeciesFormChange {
     return true;
   }
 
-  findTrigger(triggerType: Constructor<SpeciesFormChangeTrigger>): SpeciesFormChangeTrigger | null {
+  findTrigger(triggerType: Constructor<SpeciesFormChangeTrigger>): SpeciesFormChangeTrigger | nil {
     if (!this.trigger.hasTriggerType(triggerType)) {
       return null;
     }
@@ -193,7 +193,7 @@ export class SpeciesFormChange {
     const trigger = this.trigger;
 
     if (trigger instanceof SpeciesFormChangeCompoundTrigger) {
-      return trigger.triggers.find(t => t.hasTriggerType(triggerType))!; // TODO: is this bang correct?
+      return trigger.triggers.find(t => t.hasTriggerType(triggerType));
     }
 
     return trigger;
@@ -202,11 +202,11 @@ export class SpeciesFormChange {
 
 export class SpeciesFormChangeCondition {
   public predicate: SpeciesFormChangeConditionPredicate;
-  public enforceFunc: SpeciesFormChangeConditionEnforceFunc | null;
+  public enforceFunc: SpeciesFormChangeConditionEnforceFunc | nil;
 
   constructor(predicate: SpeciesFormChangeConditionPredicate, enforceFunc?: SpeciesFormChangeConditionEnforceFunc) {
     this.predicate = predicate;
-    this.enforceFunc = enforceFunc!; // TODO: is this bang correct?
+    this.enforceFunc = enforceFunc;
   }
 }
 
diff --git a/src/timed-event-manager.ts b/src/timed-event-manager.ts
index 9bfa3bdf54ac..3caa84fd39b7 100644
--- a/src/timed-event-manager.ts
+++ b/src/timed-event-manager.ts
@@ -1,5 +1,6 @@
 import BattleScene from "#app/battle-scene";
 import { TextStyle, addTextObject } from "#app/ui/text";
+import { nil } from "#app/utils";
 import i18next from "i18next";
 
 export enum EventType {
@@ -64,19 +65,19 @@ export class TimedEventManager {
     let multiplier = 1;
     const shinyEvents = timedEvents.filter((te) => te.eventType === EventType.SHINY && this.isActive(te));
     shinyEvents.forEach((se) => {
-      multiplier *= se.shinyMultiplier!; // TODO: is this bang correct?
+      multiplier *= se.shinyMultiplier ?? 1;
     });
 
     return multiplier;
   }
 
   getEventBannerFilename(): string {
-    return timedEvents.find((te: TimedEvent) => this.isActive(te))?.bannerKey!; // TODO: is this bang correct?
+    return timedEvents.find((te: TimedEvent) => this.isActive(te))?.bannerKey ?? "";
   }
 }
 
 export class TimedEventDisplay extends Phaser.GameObjects.Container {
-  private event: TimedEvent | null;
+  private event: TimedEvent | nil;
   private eventTimerText: Phaser.GameObjects.Text;
   private banner: Phaser.GameObjects.Image;
   private bannerShadow: Phaser.GameObjects.Rectangle;
@@ -84,7 +85,7 @@ export class TimedEventDisplay extends Phaser.GameObjects.Container {
 
   constructor(scene: BattleScene, x: number, y: number, event?: TimedEvent) {
     super(scene, x, y);
-    this.event = event!; // TODO: is this bang correct?
+    this.event = event;
     this.setVisible(false);
   }
 
diff --git a/src/utils.ts b/src/utils.ts
index b029067c8d6d..68331211fc01 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,6 +2,8 @@ import { MoneyFormat } from "#enums/money-format";
 import { Moves } from "#enums/moves";
 import i18next from "i18next";
 
+export type nil = null | undefined;
+
 export const MissingTextureKey = "__MISSING";
 
 export function toReadableString(str: string): string {
@@ -443,7 +445,7 @@ export function deltaRgb(rgb1: integer[], rgb2: integer[]): integer {
 }
 
 export function rgbHexToRgba(hex: string) {
-  const color = hex.match(/^([\da-f]{2})([\da-f]{2})([\da-f]{2})$/i)!; // TODO: is this bang correct?
+  const color = hex.match(/^([\da-f]{2})([\da-f]{2})([\da-f]{2})$/i) ?? ["000000", "00", "00", "00"];
   return {
     r: parseInt(color[1], 16),
     g: parseInt(color[2], 16),