diff --git a/project/src/generators/PMCLootGenerator.ts b/project/src/generators/PMCLootGenerator.ts
index f7abc809..b4f1b765 100644
--- a/project/src/generators/PMCLootGenerator.ts
+++ b/project/src/generators/PMCLootGenerator.ts
@@ -270,13 +270,14 @@ export class PMCLootGenerator
 
     protected gcd(a: number, b: number): number
     {
-        while (b !== 0)
+        let x = a;
+        let y = b;
+        while (y !== 0)
         {
-            const temp = b;
-            b = a % b;
-            a = temp;
+            const temp = y;
+            y = x % y;
+            x = temp;
         }
-
-        return a;
+        return x;
     }
 }
diff --git a/project/src/helpers/AssortHelper.ts b/project/src/helpers/AssortHelper.ts
index 88ae86e3..6b0c2a29 100644
--- a/project/src/helpers/AssortHelper.ts
+++ b/project/src/helpers/AssortHelper.ts
@@ -37,6 +37,8 @@ export class AssortHelper
         flea = false,
     ): ITraderAssort
     {
+        let strippedTraderAssorts = traderAssorts;
+
         // Trader assort does not always contain loyal_level_items
         if (!traderAssorts.loyal_level_items)
         {
@@ -59,11 +61,11 @@ export class AssortHelper
             const questStatusInProfile = this.questHelper.getQuestStatus(pmcProfile, unlockValues.questId);
             if (!unlockValues.status.includes(questStatusInProfile))
             {
-                traderAssorts = this.removeItemFromAssort(traderAssorts, assortId, flea);
+                strippedTraderAssorts = this.removeItemFromAssort(traderAssorts, assortId, flea);
             }
         }
 
-        return traderAssorts;
+        return strippedTraderAssorts;
     }
 
     /**
@@ -108,12 +110,14 @@ export class AssortHelper
      */
     public stripLockedLoyaltyAssort(pmcProfile: IPmcData, traderId: string, assort: ITraderAssort): ITraderAssort
     {
+        let strippedAssort = assort;
+
         // Trader assort does not always contain loyal_level_items
         if (!assort.loyal_level_items)
         {
             this.logger.warning(this.localisationService.getText("assort-missing_loyalty_level_object", traderId));
 
-            return assort;
+            return strippedAssort;
         }
 
         // Remove items restricted by loyalty levels above those reached by the player
@@ -121,11 +125,11 @@ export class AssortHelper
         {
             if (assort.loyal_level_items[itemId] > pmcProfile.TradersInfo[traderId].loyaltyLevel)
             {
-                assort = this.removeItemFromAssort(assort, itemId);
+                strippedAssort = this.removeItemFromAssort(assort, itemId);
             }
         }
 
-        return assort;
+        return strippedAssort;
     }
 
     /**
diff --git a/project/src/helpers/ItemHelper.ts b/project/src/helpers/ItemHelper.ts
index e39f69a6..85c28027 100644
--- a/project/src/helpers/ItemHelper.ts
+++ b/project/src/helpers/ItemHelper.ts
@@ -1463,7 +1463,6 @@ export class ItemHelper
             const modItemDbDetails = this.getItem(modItemToAdd._tpl)[1];
 
             // Include conflicting items of newly added mod in pool to be used for next mod choice
-            // biome-ignore lint/complexity/noForEach: <explanation>
             modItemDbDetails._props.ConflictingItems.forEach(incompatibleModTpls.add, incompatibleModTpls);
         }
 
@@ -1472,7 +1471,7 @@ export class ItemHelper
 
     /**
      * Get a compatible tpl from the array provided where it is not found in the provided incompatible mod tpls parameter
-     * @param possibleTpls Tpls to randomply choose from
+     * @param possibleTpls Tpls to randomly choose from
      * @param incompatibleModTpls Incompatible tpls to not allow
      * @returns Chosen tpl or null
      */
diff --git a/project/src/helpers/QuestHelper.ts b/project/src/helpers/QuestHelper.ts
index 0a09a68f..d0aa9018 100644
--- a/project/src/helpers/QuestHelper.ts
+++ b/project/src/helpers/QuestHelper.ts
@@ -692,12 +692,12 @@ export class QuestHelper
      */
     public getQuestWithOnlyLevelRequirementStartCondition(quest: IQuest): IQuest
     {
-        quest = this.jsonUtil.clone(quest);
-        quest.conditions.AvailableForStart = quest.conditions.AvailableForStart.filter((q) =>
+        const updatedQuest = this.jsonUtil.clone(quest);
+        updatedQuest.conditions.AvailableForStart = updatedQuest.conditions.AvailableForStart.filter((q) =>
             q.conditionType === "Level"
         );
 
-        return quest;
+        return updatedQuest;
     }
 
     /**
@@ -714,14 +714,22 @@ export class QuestHelper
         output: IItemEventRouterResponse = null,
     ): void
     {
+        let updatedOutput = output;
+
         // Prepare response to send back to client
-        if (!output)
+        if (!updatedOutput)
         {
-            output = this.eventOutputHolder.getOutput(sessionID);
+            updatedOutput = this.eventOutputHolder.getOutput(sessionID);
         }
 
         this.updateQuestState(pmcData, QuestStatus.Fail, failRequest.qid);
-        const questRewards = this.applyQuestReward(pmcData, failRequest.qid, QuestStatus.Fail, sessionID, output);
+        const questRewards = this.applyQuestReward(
+            pmcData,
+            failRequest.qid,
+            QuestStatus.Fail,
+            sessionID,
+            updatedOutput,
+        );
 
         // Create a dialog message for completing the quest.
         const quest = this.getQuestFromDb(failRequest.qid, pmcData);
@@ -747,7 +755,7 @@ export class QuestHelper
             }
         }
 
-        output.profileChanges[sessionID].quests.push(...this.failedUnlocked(failRequest.qid, sessionID));
+        updatedOutput.profileChanges[sessionID].quests.push(...this.failedUnlocked(failRequest.qid, sessionID));
     }
 
     /**
diff --git a/project/src/helpers/TradeHelper.ts b/project/src/helpers/TradeHelper.ts
index 358860e0..05c71d56 100644
--- a/project/src/helpers/TradeHelper.ts
+++ b/project/src/helpers/TradeHelper.ts
@@ -72,7 +72,7 @@ export class TradeHelper
     ): void
     {
         let offerItems: Item[] = [];
-        let buyCallback: { (buyCount: number); };
+        let buyCallback: (buyCount: number) => void;
         if (buyRequestData.tid.toLocaleLowerCase() === "ragfair")
         {
             buyCallback = (buyCount: number) =>
diff --git a/project/src/utils/DatabaseImporter.ts b/project/src/utils/DatabaseImporter.ts
index 78a65150..699f04b9 100644
--- a/project/src/utils/DatabaseImporter.ts
+++ b/project/src/utils/DatabaseImporter.ts
@@ -134,7 +134,7 @@ export class DatabaseImporter implements OnLoad
         try
         {
             const finalPath = filePathAndName.replace(this.filepath, "").replace(".json", "");
-            let tempObject;
+            let tempObject: any;
             for (const prop of finalPath.split("/"))
             {
                 if (!tempObject)