diff --git a/.eslintrc.js b/.eslintrc.js
index 2e1d646e37..54203c4ecb 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -35,6 +35,7 @@ module.exports = {
     "@typescript-eslint/no-explicit-any": "off",
     "react/no-unescaped-entities": "off",
     "@typescript-eslint/restrict-template-expressions": "off",
+    "@typescript-eslint/no-unsafe-enum-comparison": "off",
   },
   settings: {
     react: {
diff --git a/src/@types/global.d.ts b/src/@types/global.d.ts
index 9289bcc2cf..670eb9e44b 100644
--- a/src/@types/global.d.ts
+++ b/src/@types/global.d.ts
@@ -49,3 +49,14 @@ declare global {
     }
   }
 }
+
+module "monaco-vim" {
+  export const initVimMode: (...args: unknown[]) => { dispose: () => void };
+  export const VimMode: {
+    Vim: {
+      defineEx: (...args: unknown[]) => void;
+      mapCommand: (...args: unknown[]) => void;
+      defineAction: (...args: unknown[]) => void;
+    };
+  };
+}
diff --git a/src/Casino/CardDeck/ReactCard.tsx b/src/Casino/CardDeck/ReactCard.tsx
index 73345afbac..074dc7a42c 100644
--- a/src/Casino/CardDeck/ReactCard.tsx
+++ b/src/Casino/CardDeck/ReactCard.tsx
@@ -3,6 +3,7 @@ import { Card, Suit } from "./Card";
 
 import { makeStyles } from "tss-react/mui";
 import Paper from "@mui/material/Paper";
+import { throwIfReachable } from "../../utils/helpers/throwIfReachable";
 
 interface Props {
   card: Card;
@@ -51,7 +52,7 @@ export const ReactCard: FC<Props> = ({ card, hidden }) => {
       suit = <span>&#9824;</span>;
       break;
     default:
-      throw new Error(`MissingCaseException: ${card.suit}`);
+      throwIfReachable(card.suit);
   }
   return (
     <Paper className={`${classes.card} ${card.isRedSuit() ? classes.red : classes.black}`}>
diff --git a/src/Company/GetJobRequirements.ts b/src/Company/GetJobRequirements.ts
index 3c9ed2e913..03d8102c51 100644
--- a/src/Company/GetJobRequirements.ts
+++ b/src/Company/GetJobRequirements.ts
@@ -2,13 +2,15 @@ import { Company } from "./Company";
 import { CompanyPosition } from "./CompanyPosition";
 
 import { PlayerCondition, haveSkill, haveCompanyRep } from "../Faction/FactionJoinCondition";
-import type { Skills } from "../PersonObjects/Skills";
+import { getRecordEntries } from "../Types/Record";
 
 export function getJobRequirements(company: Company, pos: CompanyPosition): PlayerCondition[] {
   const reqSkills = pos.requiredSkills(company.jobStatReqOffset);
   const reqs = [];
-  for (const [skillName, value] of Object.entries(reqSkills)) {
-    if (value > 0) reqs.push(haveSkill(skillName as keyof Skills, value));
+  for (const [skillName, value] of getRecordEntries(reqSkills)) {
+    if (value > 0) {
+      reqs.push(haveSkill(skillName, value));
+    }
   }
   if (pos.requiredReputation > 0) {
     reqs.push(haveCompanyRep(company.name, pos.requiredReputation));
diff --git a/src/Corporation/Corporation.ts b/src/Corporation/Corporation.ts
index 800921ae7d..f90b0bc1e5 100644
--- a/src/Corporation/Corporation.ts
+++ b/src/Corporation/Corporation.ts
@@ -17,7 +17,7 @@ import { dialogBoxCreate } from "../ui/React/DialogBox";
 import { constructorsForReviver, Generic_toJSON, Generic_fromJSON, IReviverValue } from "../utils/JSONReviver";
 import { JSONMap, JSONSet } from "../Types/Jsonable";
 import { formatMoney } from "../ui/formatNumber";
-import { isPositiveInteger } from "../types";
+import { isPositiveInteger, type Result } from "../types";
 import { createEnumKeyedRecord, getRecordValues } from "../Types/Record";
 import { getKeyList } from "../utils/helpers/getKeyList";
 
@@ -372,29 +372,56 @@ export class Corporation {
     }
   }
 
-  /** Purchasing a one-time unlock
-   * @returns A string on failure, indicating the reason for failure. */
-  purchaseUnlock(unlockName: CorpUnlockName): string | void {
-    if (this.unlocks.has(unlockName)) return `The corporation has already unlocked ${unlockName}`;
+  /**
+   * Purchasing a one-time unlock
+   */
+  purchaseUnlock(unlockName: CorpUnlockName): Result {
+    if (this.unlocks.has(unlockName)) {
+      return {
+        success: false,
+        message: `${unlockName} has already been unlocked.`,
+      };
+    }
     const price = CorpUnlocks[unlockName].price;
-    if (this.funds < price) return `Insufficient funds to purchase ${unlockName}, requires ${formatMoney(price)}`;
+    if (this.funds < price) {
+      return {
+        success: false,
+        message: `Insufficient funds to purchase ${unlockName}, requires ${formatMoney(price)}.`,
+      };
+    }
     this.loseFunds(price, "upgrades");
     this.unlocks.add(unlockName);
 
     // Apply effects for one-time unlocks
-    if (unlockName === CorpUnlockName.ShadyAccounting) this.dividendTax -= 0.05;
-    if (unlockName === CorpUnlockName.GovernmentPartnership) this.dividendTax -= 0.1;
+    if (unlockName === CorpUnlockName.ShadyAccounting) {
+      this.dividendTax -= 0.05;
+    }
+    if (unlockName === CorpUnlockName.GovernmentPartnership) {
+      this.dividendTax -= 0.1;
+    }
+    return {
+      success: true,
+    };
   }
 
-  /** Purchasing a levelable upgrade
-   * @returns A string on failure, indicating the reason for failure. */
-  purchaseUpgrade(upgradeName: CorpUpgradeName, amount = 1): string | void {
+  /**
+   * Purchasing a levelable upgrade
+   */
+  purchaseUpgrade(upgradeName: CorpUpgradeName, amount = 1): Result {
     if (!isPositiveInteger(amount)) {
-      return `Number of upgrade levels purchased must be a positive integer (attempted: ${amount}).`;
+      return {
+        success: false,
+        message: `Number of upgrade levels purchased must be a positive integer (attempted: ${amount}).`,
+      };
     }
     const upgrade = CorpUpgrades[upgradeName];
     const totalCost = calculateUpgradeCost(this, upgrade, amount);
-    if (this.funds < totalCost) return `Not enough funds to purchase ${amount} of upgrade ${upgradeName}.`;
+    if (this.funds < totalCost) {
+      return {
+        success: false,
+        message: `Not enough funds to purchase ${amount} of upgrade ${upgradeName}.`,
+      };
+    }
     this.loseFunds(totalCost, "upgrades");
     this.upgrades[upgradeName].level += amount;
     this.upgrades[upgradeName].value += upgrade.benefit * amount;
@@ -407,6 +434,9 @@ export class Corporation {
         }
       }
     }
+    return {
+      success: true,
+    };
   }
 
   getProductionMultiplier(): number {
diff --git a/src/Corporation/Division.ts b/src/Corporation/Division.ts
index 0d521cb97e..9ccb54a109 100644
--- a/src/Corporation/Division.ts
+++ b/src/Corporation/Division.ts
@@ -16,6 +16,7 @@ import { PartialRecord, getRecordEntries, getRecordKeys, getRecordValues } from
 import { Material } from "./Material";
 import { getKeyList } from "../utils/helpers/getKeyList";
 import { calculateMarkupMultiplier } from "./helpers";
+import { throwIfReachable } from "../utils/helpers/throwIfReachable";
 
 interface DivisionParams {
   name: string;
@@ -704,8 +705,7 @@ export class Division {
         case "START":
           break;
         default:
-          console.error(`Invalid state: ${state}`);
-          break;
+          throwIfReachable(state);
       } //End switch(this.state)
       this.updateWarehouseSizeUsed(warehouse);
     }
@@ -936,8 +936,7 @@ export class Division {
         case "EXPORT":
           break;
         default:
-          console.error(`Invalid State: ${state}`);
-          break;
+          throwIfReachable(state);
       } //End switch(this.state)
       this.updateWarehouseSizeUsed(warehouse);
     }
diff --git a/src/Corporation/OfficeSpace.ts b/src/Corporation/OfficeSpace.ts
index 6de7c114f2..fce5a93e4e 100644
--- a/src/Corporation/OfficeSpace.ts
+++ b/src/Corporation/OfficeSpace.ts
@@ -5,6 +5,7 @@ import { Division } from "./Division";
 import { Corporation } from "./Corporation";
 import { getRandomIntInclusive } from "../utils/helpers/getRandomIntInclusive";
 import { createEnumKeyedRecord, getRecordKeys } from "../Types/Record";
+import { throwIfReachable } from "../utils/helpers/throwIfReachable";
 
 interface IParams {
   city: CityName;
@@ -165,8 +166,7 @@ export class OfficeSpace {
         case "total":
           continue;
         default:
-          console.error(`Invalid employee position: ${name}`);
-          break;
+          throwIfReachable(name);
       }
       this.employeeProductionByJob[name] = this.employeeJobs[name] * prodMult * prodBase;
       total += this.employeeProductionByJob[name];
diff --git a/src/Corporation/Product.ts b/src/Corporation/Product.ts
index 5a551fcd3b..2de76168a2 100644
--- a/src/Corporation/Product.ts
+++ b/src/Corporation/Product.ts
@@ -214,7 +214,9 @@ export class Product {
 
   calculateRating(industry: Division): void {
     const weights = IndustriesData[industry.type].product?.ratingWeights;
-    if (!weights) return console.error(`Could not find product rating weights for: ${industry}`);
+    if (!weights) {
+      return console.error(`Could not find product rating weights for: ${industry.name}`);
+    }
     this.rating = getRecordEntries(weights).reduce(
       (total, [statName, weight]) => total + this.stats[statName] * weight,
       0,
diff --git a/src/Corporation/ui/LevelableUpgrade.tsx b/src/Corporation/ui/LevelableUpgrade.tsx
index d625db64ea..709a0d436d 100644
--- a/src/Corporation/ui/LevelableUpgrade.tsx
+++ b/src/Corporation/ui/LevelableUpgrade.tsx
@@ -31,8 +31,10 @@ export function LevelableUpgrade({ upgradeName, mult, rerender }: IProps): React
   const tooltip = data.desc;
   function onClick(): void {
     if (corp.funds < cost) return;
-    const message = corp.purchaseUpgrade(upgradeName, amount);
-    if (message) dialogBoxCreate(`Could not upgrade ${upgradeName} ${amount} times:\n${message}`);
+    const result = corp.purchaseUpgrade(upgradeName, amount);
+    if (!result.success) {
+      dialogBoxCreate(`Could not upgrade ${upgradeName} ${amount} times:\n${result.message}`);
+    }
     rerender();
   }
 
diff --git a/src/Corporation/ui/Unlock.tsx b/src/Corporation/ui/Unlock.tsx
index 13ef9e9e71..90cdf5812d 100644
--- a/src/Corporation/ui/Unlock.tsx
+++ b/src/Corporation/ui/Unlock.tsx
@@ -25,8 +25,10 @@ export function Unlock(props: UnlockProps): React.ReactElement {
 
   function onClick(): void {
     // corp.unlock handles displaying a dialog on failure
-    const message = corp.purchaseUnlock(props.name);
-    if (message) dialogBoxCreate(`Error while attempting to purchase ${props.name}:\n${message}`);
+    const result = corp.purchaseUnlock(props.name);
+    if (!result.success) {
+      dialogBoxCreate(`Error while attempting to purchase ${props.name}:\n${result.message}`);
+    }
     // Rerenders the parent, which should remove this item if the purchase was successful
     props.rerender();
   }
diff --git a/src/Corporation/ui/modals/SellSharesModal.tsx b/src/Corporation/ui/modals/SellSharesModal.tsx
index 9a5b95a2af..7b9aaa3ad8 100644
--- a/src/Corporation/ui/modals/SellSharesModal.tsx
+++ b/src/Corporation/ui/modals/SellSharesModal.tsx
@@ -44,8 +44,8 @@ export function SellSharesModal(props: IProps): React.ReactElement {
       props.onClose();
       props.rerender();
       setShares(NaN);
-    } catch (err) {
-      dialogBoxCreate(`${err as Error}`);
+    } catch (error) {
+      dialogBoxCreate(String(error));
     }
   }
 
diff --git a/src/CotMG/Helper.tsx b/src/CotMG/Helper.tsx
index 661c1948b1..0c45899d8d 100644
--- a/src/CotMG/Helper.tsx
+++ b/src/CotMG/Helper.tsx
@@ -7,17 +7,17 @@ export let staneksGift = new StaneksGift();
 
 export function loadStaneksGift(saveString: string): void {
   if (saveString) {
-    staneksGift = JSON.parse(saveString, Reviver);
+    staneksGift = JSON.parse(saveString, Reviver) as StaneksGift;
   } else {
     staneksGift = new StaneksGift();
   }
 }
 
 export function zeros(width: number, height: number): number[][] {
-  const array = [];
+  const array: number[][] = [];
 
   for (let i = 0; i < width; ++i) {
-    array.push(Array(height).fill(0));
+    array.push(Array<number>(height).fill(0));
   }
 
   return array;
diff --git a/src/CotMG/StaneksGift.ts b/src/CotMG/StaneksGift.ts
index 9f4d26b0b9..95dc283b4c 100644
--- a/src/CotMG/StaneksGift.ts
+++ b/src/CotMG/StaneksGift.ts
@@ -18,9 +18,6 @@ export class StaneksGift extends BaseGift {
   isBonusCharging = false;
   justCharged = true;
   storedCycles = 0;
-  constructor() {
-    super();
-  }
 
   baseSize(): number {
     return StanekConstants.BaseSize + currentNodeMults.StaneksGiftExtraSize + Player.activeSourceFileLvl(13);
diff --git a/src/GameOptions/ui/GameOptionsSidebar.tsx b/src/GameOptions/ui/GameOptionsSidebar.tsx
index a6c3891d57..3c4394b3bb 100644
--- a/src/GameOptions/ui/GameOptionsSidebar.tsx
+++ b/src/GameOptions/ui/GameOptionsSidebar.tsx
@@ -155,13 +155,27 @@ export const GameOptionsSidebar = (props: IProps): React.ReactElement => {
         >
           <Button onClick={startImport} startIcon={<Upload />} sx={{ gridArea: "import" }}>
             Import Game
-            <input ref={importInput} id="import-game-file-selector" type="file" hidden onChange={onImport} />
+            <input
+              ref={importInput}
+              id="import-game-file-selector"
+              type="file"
+              hidden
+              onChange={(event) => {
+                onImport(event).catch((error) => {
+                  console.error(error);
+                });
+              }}
+            />
           </Button>
         </Tooltip>
         <ConfirmationModal
           open={importSaveOpen}
           onClose={() => setImportSaveOpen(false)}
-          onConfirm={() => confirmedImportGame()}
+          onConfirm={() => {
+            confirmedImportGame().catch((error) => {
+              console.error(error);
+            });
+          }}
           additionalButton={<Button onClick={compareSaveGame}>Compare Save</Button>}
           confirmationText={
             <>
diff --git a/src/Gang/ui/GangMemberStats.tsx b/src/Gang/ui/GangMemberStats.tsx
index c3b2b73d40..5575bc6961 100644
--- a/src/Gang/ui/GangMemberStats.tsx
+++ b/src/Gang/ui/GangMemberStats.tsx
@@ -15,6 +15,7 @@ import { Settings } from "../../Settings/Settings";
 import { MoneyRate } from "../../ui/React/MoneyRate";
 import { StatsRow } from "../../ui/React/StatsRow";
 import { useStyles } from "../../ui/React/CharacterOverview";
+import { getKeyFromReactElements } from "../../utils/StringHelperFunctions";
 
 interface IProps {
   member: GangMember;
@@ -103,7 +104,7 @@ export function GangMemberStats(props: IProps): React.ReactElement {
               </TableCell>
             </TableRow>
             {data.map(([a, b]) => (
-              <TableRow key={a.toString() + b.toString()}>
+              <TableRow key={getKeyFromReactElements(a, b)}>
                 <TableCell classes={{ root: classes.cellNone }}>
                   <Typography>{a}</Typography>
                 </TableCell>
diff --git a/src/Go/SaveLoad.ts b/src/Go/SaveLoad.ts
index 48f9081243..8b76b50d77 100644
--- a/src/Go/SaveLoad.ts
+++ b/src/Go/SaveLoad.ts
@@ -83,7 +83,11 @@ export function loadGo(data: unknown): boolean {
   Go.storeCycles(loadStoredCycles(parsedData.storedCycles));
 
   // If it's the AI's turn, initiate their turn, which will populate nextTurn
-  if (currentGame.previousPlayer === GoColor.black && currentGame.ai !== GoOpponent.none) makeAIMove(currentGame);
+  if (currentGame.previousPlayer === GoColor.black && currentGame.ai !== GoOpponent.none) {
+    makeAIMove(currentGame).catch((error) => {
+      showError(error);
+    });
+  }
   // If it's not the AI's turn and we're not in gameover status, initialize nextTurn promise based on the previous move/pass
   else if (currentGame.previousPlayer) {
     const previousMove = getPreviousMove();
diff --git a/src/Infiltration/ui/MinesweeperGame.tsx b/src/Infiltration/ui/MinesweeperGame.tsx
index d9c5edde08..81df2942ee 100644
--- a/src/Infiltration/ui/MinesweeperGame.tsx
+++ b/src/Infiltration/ui/MinesweeperGame.tsx
@@ -135,7 +135,7 @@ export function MinesweeperGame(props: IMinigameProps): React.ReactElement {
 
             return (
               <Typography
-                key={`${item}${uniqueId()}`}
+                key={uniqueId()}
                 sx={{
                   color: color,
                   border: `2px solid ${item.current ? Settings.theme.infolight : Settings.theme.primary}`,
diff --git a/src/Netscript/APIWrapper.ts b/src/Netscript/APIWrapper.ts
index 4e69d7e7b4..4a00810779 100644
--- a/src/Netscript/APIWrapper.ts
+++ b/src/Netscript/APIWrapper.ts
@@ -66,7 +66,7 @@ class NSProxyHandler<API extends GenericAPI<API>> {
 
     const descriptor = Object.getOwnPropertyDescriptor(this.ns, key);
     if (!descriptor) return descriptor;
-    const field = descriptor.value;
+    const field: unknown = descriptor.value;
 
     if (typeof field === "function") {
       const arrayPath = [...this.tree, key];
@@ -74,7 +74,7 @@ class NSProxyHandler<API extends GenericAPI<API>> {
       const ctx = { workerScript: this.ws, function: key, functionPath };
       // Only do the context-binding once, instead of each time the function
       // is called.
-      const func: any = field(ctx);
+      const func = field(ctx) as (...args: unknown[]) => unknown;
       const wrappedFunction = function (...args: unknown[]): unknown {
         // What remains *must* be called every time.
         helpers.checkEnvFlags(ctx);
diff --git a/src/Netscript/NetscriptHelpers.tsx b/src/Netscript/NetscriptHelpers.tsx
index 9c9eb0441b..24c6dac7c9 100644
--- a/src/Netscript/NetscriptHelpers.tsx
+++ b/src/Netscript/NetscriptHelpers.tsx
@@ -692,8 +692,11 @@ function getRunningScript(ctx: NetscriptContext, ident: ScriptIdentifier): Runni
     return findRunningScriptByPid(ident);
   } else {
     const scripts = getRunningScriptsByArgs(ctx, ident.scriptname, ident.hostname, ident.args);
-    if (scripts === null) return null;
-    return scripts.values().next().value ?? null;
+    if (scripts === null) {
+      return null;
+    }
+    const next = scripts.values().next();
+    return !next.done ? next.value : null;
   }
 }
 
diff --git a/src/NetscriptFunctions/Corporation.ts b/src/NetscriptFunctions/Corporation.ts
index 2cd5b24265..5cbad188c8 100644
--- a/src/NetscriptFunctions/Corporation.ts
+++ b/src/NetscriptFunctions/Corporation.ts
@@ -624,15 +624,19 @@ export function NetscriptCorporation(): InternalAPI<NSCorporation> {
       checkAccess(ctx);
       const unlockName = getEnumHelper("CorpUnlockName").nsGetMember(ctx, _unlockName, "unlockName");
       const corporation = getCorporation();
-      const message = corporation.purchaseUnlock(unlockName);
-      if (message) throw new Error(`Could not unlock ${unlockName}: ${message}`);
+      const result = corporation.purchaseUnlock(unlockName);
+      if (!result.success) {
+        throw new Error(`Could not unlock ${unlockName}: ${result.message}`);
+      }
     },
     levelUpgrade: (ctx) => (_upgradeName) => {
       checkAccess(ctx);
       const upgradeName = getEnumHelper("CorpUpgradeName").nsGetMember(ctx, _upgradeName, "upgradeName");
       const corporation = getCorporation();
-      const message = corporation.purchaseUpgrade(upgradeName, 1);
-      if (message) throw new Error(`Could not upgrade ${upgradeName}: ${message}`);
+      const result = corporation.purchaseUpgrade(upgradeName, 1);
+      if (!result.success) {
+        throw new Error(`Could not upgrade ${upgradeName}: ${result.message}`);
+      }
     },
     issueDividends: (ctx) => (_rate) => {
       checkAccess(ctx);
diff --git a/src/NetscriptFunctions/Infiltration.ts b/src/NetscriptFunctions/Infiltration.ts
index f860c87696..1681b4bbcd 100644
--- a/src/NetscriptFunctions/Infiltration.ts
+++ b/src/NetscriptFunctions/Infiltration.ts
@@ -13,6 +13,7 @@ import { Factions } from "../Faction/Factions";
 import { getEnumHelper } from "../utils/EnumHelper";
 import { helpers } from "../Netscript/NetscriptHelpers";
 import { filterTruthy } from "../utils/helpers/ArrayHelpers";
+import { exceptionAlert } from "../utils/helpers/exceptionAlert";
 
 export function NetscriptInfiltration(): InternalAPI<NetscriptInfiltation> {
   const getLocationsWithInfiltrations = Object.values(Locations).filter(
@@ -21,16 +22,29 @@ export function NetscriptInfiltration(): InternalAPI<NetscriptInfiltation> {
 
   const calculateInfiltrationData = (ctx: NetscriptContext, locationName: LocationName): InfiltrationLocation => {
     const location = Locations[locationName];
-    if (location === undefined) throw helpers.errorMessage(ctx, `Location '${location}' does not exists.`);
-    if (location.infiltrationData === undefined)
-      throw helpers.errorMessage(ctx, `Location '${location}' does not provide infiltrations.`);
+    if (location === undefined) {
+      throw helpers.errorMessage(ctx, `Location "${locationName}" does not exist.`);
+    }
+    if (location.infiltrationData === undefined) {
+      throw helpers.errorMessage(ctx, `Location "${locationName}" does not provide infiltrations.`);
+    }
+    const locationCity = location.city;
+    /**
+     * location.city is only null when the location is available in all cities. This kind of location does not have
+     * infiltration data.
+     */
+    if (locationCity === null) {
+      const errorMessage = `Location "${locationName}" is available in all cities, but it still has infiltration data.`;
+      exceptionAlert(new Error(errorMessage));
+      throw helpers.errorMessage(ctx, errorMessage);
+    }
     const startingSecurityLevel = location.infiltrationData.startingSecurityLevel;
     const difficulty = calculateDifficulty(startingSecurityLevel);
     const reward = calculateReward(startingSecurityLevel);
     const maxLevel = location.infiltrationData.maxClearanceLevel;
     return {
       location: {
-        city: location.city!,
+        city: locationCity,
         name: location.name,
       },
       reward: {
diff --git a/src/NetscriptPort.ts b/src/NetscriptPort.ts
index f9dc1dcb18..c26864e0b8 100644
--- a/src/NetscriptPort.ts
+++ b/src/NetscriptPort.ts
@@ -47,7 +47,7 @@ export function portHandle(n: PortNumber): NetscriptPort {
   };
 }
 
-export function writePort(n: PortNumber, value: unknown): any {
+export function writePort(n: PortNumber, value: unknown): unknown {
   const port = getPort(n);
   // Primitives don't need to be cloned.
   port.add(isObjectLike(value) ? structuredClone(value) : value);
@@ -63,15 +63,15 @@ export function tryWritePort(n: PortNumber, value: unknown): boolean {
   return true;
 }
 
-export function readPort(n: PortNumber): any {
+export function readPort(n: PortNumber): unknown {
   const port = NetscriptPorts.get(n);
   if (!port || !port.data.length) return emptyPortData;
-  const returnVal = port.data.shift();
+  const returnVal: unknown = port.data.shift();
   if (!port.data.length && !port.resolver) NetscriptPorts.delete(n);
   return returnVal;
 }
 
-export function peekPort(n: PortNumber): any {
+export function peekPort(n: PortNumber): unknown {
   const port = NetscriptPorts.get(n);
   if (!port || !port.data.length) return emptyPortData;
   // Needed to avoid exposing internal objects.
diff --git a/src/PersonObjects/Sleeve/ui/StatsElement.tsx b/src/PersonObjects/Sleeve/ui/StatsElement.tsx
index 80a8d8127f..d490bbce05 100644
--- a/src/PersonObjects/Sleeve/ui/StatsElement.tsx
+++ b/src/PersonObjects/Sleeve/ui/StatsElement.tsx
@@ -26,6 +26,7 @@ import { isSleeveFactionWork } from "../Work/SleeveFactionWork";
 import { isSleeveCompanyWork } from "../Work/SleeveCompanyWork";
 import { isSleeveCrimeWork } from "../Work/SleeveCrimeWork";
 import { canAccessBitNodeFeature } from "../../../BitNode/BitNodeUtils";
+import { getKeyFromReactElements } from "../../../utils/StringHelperFunctions";
 
 const CYCLES_PER_SEC = 1000 / CONSTANTS.MilliPerCycle;
 
@@ -177,7 +178,7 @@ export function EarningsElement(props: IProps): React.ReactElement {
           </TableCell>
         </TableRow>
         {data.map(([a, b]) => (
-          <TableRow key={a.toString() + b.toString()}>
+          <TableRow key={getKeyFromReactElements(a, b)}>
             <TableCell classes={{ root: classes.cellNone }}>
               <Typography>{a}</Typography>
             </TableCell>
diff --git a/src/Script/RamCalculations.ts b/src/Script/RamCalculations.ts
index fcc799b061..be6b46a9c0 100644
--- a/src/Script/RamCalculations.ts
+++ b/src/Script/RamCalculations.ts
@@ -231,16 +231,16 @@ function parseOnlyRamCalculate(
         prefix: string,
         obj: object,
         ref: string,
-      ): { func: () => number | number; refDetail: string } | undefined => {
+      ): { func: (() => number) | number; refDetail: string } | undefined => {
         if (!obj) {
           return;
         }
         const elem = Object.entries(obj).find(([key]) => key === ref);
         if (elem !== undefined && (typeof elem[1] === "function" || typeof elem[1] === "number")) {
-          return { func: elem[1], refDetail: `${prefix}${ref}` };
+          return { func: elem[1] as (() => number) | number, refDetail: `${prefix}${ref}` };
         }
         for (const [key, value] of Object.entries(obj)) {
-          const found = findFunc(`${key}.`, value, ref);
+          const found = findFunc(`${key}.`, value as object, ref);
           if (found) {
             return found;
           }
diff --git a/src/Script/Script.ts b/src/Script/Script.ts
index d5ee9d6cef..dcbfd2cec2 100644
--- a/src/Script/Script.ts
+++ b/src/Script/Script.ts
@@ -76,7 +76,7 @@ export class Script implements ContentFile {
     const ramCalc = calculateRamUsage(this.code, this.filename, this.server, otherScripts);
     if (ramCalc.cost && ramCalc.cost >= RamCostConstants.Base) {
       this.ramUsage = roundToTwo(ramCalc.cost);
-      this.ramUsageEntries = ramCalc.entries as RamUsageEntry[];
+      this.ramUsageEntries = ramCalc.entries;
       this.ramCalculationError = null;
       return;
     }
diff --git a/src/ScriptEditor/ui/useVimEditor.tsx b/src/ScriptEditor/ui/useVimEditor.tsx
index 4ad98b8095..27f8d43035 100644
--- a/src/ScriptEditor/ui/useVimEditor.tsx
+++ b/src/ScriptEditor/ui/useVimEditor.tsx
@@ -1,5 +1,4 @@
 import React, { useEffect, useRef, useState } from "react";
-// @ts-expect-error This library does not have types.
 import * as MonacoVim from "monaco-vim";
 import type { editor } from "monaco-editor";
 type IStandaloneCodeEditor = editor.IStandaloneCodeEditor;
@@ -18,8 +17,7 @@ interface IProps {
 }
 
 export function useVimEditor({ editor, vim, onOpenNextTab, onOpenPreviousTab, onSave }: IProps) {
-  // monaco-vim does not have types, so this is an any
-  const [vimEditor, setVimEditor] = useState<any>(null);
+  const [vimEditor, setVimEditor] = useState<ReturnType<typeof MonacoVim.initVimMode> | null>(null);
 
   const statusBarRef = useRef<React.ReactElement | null>(null);
   const rerender = useRerender();
@@ -30,7 +28,6 @@ export function useVimEditor({ editor, vim, onOpenNextTab, onOpenPreviousTab, on
   useEffect(() => {
     // setup monaco-vim
     if (vim && editor && !vimEditor) {
-      // Using try/catch because MonacoVim does not have types.
       try {
         setVimEditor(MonacoVim.initVimMode(editor, statusBarRef, StatusBar, rerender));
         MonacoVim.VimMode.Vim.defineEx("write", "w", function () {
@@ -65,8 +62,7 @@ export function useVimEditor({ editor, vim, onOpenNextTab, onOpenPreviousTab, on
         MonacoVim.VimMode.Vim.mapCommand("gT", "action", "prevTabs", {}, { context: "normal" });
         editor.focus();
       } catch (e) {
-        console.error("An error occurred while loading monaco-vim:");
-        console.error(e);
+        console.error("An error occurred while loading monaco-vim:", e);
       }
     } else if (!vim) {
       // When vim mode is disabled
diff --git a/src/ScriptEditor/ui/utils.ts b/src/ScriptEditor/ui/utils.ts
index c00c9c8c0b..d4cde39b4e 100644
--- a/src/ScriptEditor/ui/utils.ts
+++ b/src/ScriptEditor/ui/utils.ts
@@ -2,6 +2,7 @@ import { GetServer } from "../../Server/AllServers";
 import { editor, Uri } from "monaco-editor";
 import { OpenScript } from "./OpenScript";
 import { getFileType, FileType } from "../../utils/ScriptTransformer";
+import { throwIfReachable } from "../../utils/helpers/throwIfReachable";
 
 function getServerCode(scripts: OpenScript[], index: number): string | null {
   const openScript = scripts[index];
@@ -48,7 +49,7 @@ function makeModel(hostname: string, filename: string, code: string) {
       language = "javascript";
       break;
     default:
-      throw new Error(`Invalid file type: ${fileType}. Filename: ${filename}.`);
+      throwIfReachable(fileType);
   }
   //if somehow a model already exist return it
   return editor.getModel(uri) ?? editor.createModel(code, language, uri);
diff --git a/src/Sidebar/ui/SidebarAccordion.tsx b/src/Sidebar/ui/SidebarAccordion.tsx
index a56521378b..ff4f4a9c88 100644
--- a/src/Sidebar/ui/SidebarAccordion.tsx
+++ b/src/Sidebar/ui/SidebarAccordion.tsx
@@ -8,8 +8,9 @@ import Typography from "@mui/material/Typography";
 import ExpandLessIcon from "@mui/icons-material/ExpandLess";
 import ExpandMoreIcon from "@mui/icons-material/ExpandMore";
 
-import { SidebarItem, ICreateProps as IItemProps } from "./SidebarItem";
+import { SidebarItem, ICreateProps as IItemProps, type SidebarItemProps } from "./SidebarItem";
 import type { Page } from "../../ui/Router";
+import type { PartialRecord } from "../../Types/Record";
 
 type SidebarAccordionProps = {
   key_: string;
@@ -19,9 +20,12 @@ type SidebarAccordionProps = {
   items: (IItemProps | boolean)[];
   icon: React.ReactElement["type"];
   sidebarOpen: boolean;
-  classes: any;
+  classes: Record<"listitem" | "active", string>;
 };
 
+type ClickFnCacheKeyType = (page: Page) => void;
+type ClickFnCacheValueType = PartialRecord<Page, SidebarItemProps["clickFn"]>;
+
 // We can't useCallback for this, because in the items map it would be
 // called a changing number of times, and hooks can't be called in loops. So
 // we set up this explicit cache of function objects instead.
@@ -30,7 +34,7 @@ type SidebarAccordionProps = {
 // WeakMap prevents memory leaks. We won't drop slices of the cache too soon,
 // because the fn keys are themselves memoized elsewhere, which keeps them
 // alive and thus keeps the WeakMap entries alive.
-const clickFnCache = new WeakMap();
+const clickFnCache = new WeakMap<ClickFnCacheKeyType, ClickFnCacheValueType>();
 function getClickFn(toWrap: (page: Page) => void, page: Page) {
   let first = clickFnCache.get(toWrap);
   if (first === undefined) {
diff --git a/src/Sidebar/ui/SidebarItem.tsx b/src/Sidebar/ui/SidebarItem.tsx
index e360dd1f85..e181a90891 100644
--- a/src/Sidebar/ui/SidebarItem.tsx
+++ b/src/Sidebar/ui/SidebarItem.tsx
@@ -18,7 +18,7 @@ export interface ICreateProps {
 export interface SidebarItemProps extends ICreateProps {
   clickFn: () => void;
   flash: boolean;
-  classes: any;
+  classes: Record<"listitem" | "active", string>;
   sidebarOpen: boolean;
 }
 
diff --git a/src/StockMarket/OrderProcessing.tsx b/src/StockMarket/OrderProcessing.tsx
index 31f565902d..0ded485b17 100644
--- a/src/StockMarket/OrderProcessing.tsx
+++ b/src/StockMarket/OrderProcessing.tsx
@@ -17,6 +17,7 @@ import { dialogBoxCreate } from "../ui/React/DialogBox";
 import { Settings } from "../Settings/Settings";
 
 import * as React from "react";
+import { throwIfReachable } from "../utils/helpers/throwIfReachable";
 
 export interface IProcessOrderRefs {
   stockMarket: IStockMarket;
@@ -50,8 +51,8 @@ export function processOrders(
     return; // Newly created, so no orders to process
   }
   let stockOrders = orderBook[stock.symbol];
-  if (stockOrders == null || !(stockOrders.constructor === Array)) {
-    console.error(`Invalid Order book for ${stock.symbol} in processOrders(): ${stockOrders}`);
+  if (stockOrders == null || !Array.isArray(stockOrders)) {
+    console.error(`Invalid Order book for ${stock.symbol} in processOrders(). stockOrders: ${stockOrders}`);
     stockOrders = [];
     return;
   }
@@ -88,8 +89,7 @@ export function processOrders(
           }
           break;
         default:
-          console.warn(`Invalid order type: ${order.type}`);
-          return;
+          throwIfReachable(order.type);
       }
     }
   }
@@ -137,8 +137,7 @@ function executeOrder(order: Order, refs: IProcessOrderRefs): void {
       }
       break;
     default:
-      console.warn(`Invalid order type: ${order.type}`);
-      return;
+      throwIfReachable(order.type);
   }
 
   // Position type, for logging/message purposes
diff --git a/src/Terminal/commands/check.ts b/src/Terminal/commands/check.ts
index 0c9553f9c1..e798582494 100644
--- a/src/Terminal/commands/check.ts
+++ b/src/Terminal/commands/check.ts
@@ -21,6 +21,9 @@ export function check(args: (string | number | boolean)[], server: BaseServer):
       Terminal.error(`No script named ${scriptName} is running on the server`);
       return;
     }
-    runningScripts.values().next().value.displayLog();
+    const next = runningScripts.values().next();
+    if (!next.done) {
+      next.value.displayLog();
+    }
   }
 }
diff --git a/src/Terminal/commands/expr.ts b/src/Terminal/commands/expr.ts
index a820de2b2a..b79bd611b7 100644
--- a/src/Terminal/commands/expr.ts
+++ b/src/Terminal/commands/expr.ts
@@ -9,11 +9,11 @@ export function expr(args: (string | number | boolean)[]): void {
 
   // Sanitize the math expression
   const sanitizedExpr = expr.replace(/[^-()\d/*+.%]/g, "");
-  let result;
+  let result: string;
   try {
-    result = eval?.(sanitizedExpr);
+    result = String(eval?.(sanitizedExpr));
   } catch (e) {
-    Terminal.error(`Could not evaluate expression: ${sanitizedExpr}`);
+    Terminal.error(`Could not evaluate expression: ${sanitizedExpr}. Error: ${e}.`);
     return;
   }
   Terminal.print(result);
diff --git a/src/Terminal/ui/TerminalInput.tsx b/src/Terminal/ui/TerminalInput.tsx
index 2a276c7890..77de9882c8 100644
--- a/src/Terminal/ui/TerminalInput.tsx
+++ b/src/Terminal/ui/TerminalInput.tsx
@@ -86,7 +86,7 @@ export function TerminalInput(): React.ReactElement {
   function getSearchSuggestionPrespace() {
     const currentPrefix = `[${Player.getCurrentServer().hostname} /${Terminal.cwd()}]> `;
     const prefixLength = `${currentPrefix}${value}`.length;
-    return Array(prefixLength).fill(" ");
+    return Array<string>(prefixLength).fill(" ");
   }
 
   function modifyInput(mod: Modification): void {
@@ -206,7 +206,7 @@ export function TerminalInput(): React.ReactElement {
     return () => document.removeEventListener("keydown", keyDown);
   });
 
-  async function onKeyDown(event: React.KeyboardEvent<HTMLInputElement>): Promise<void> {
+  async function onKeyDown(event: React.KeyboardEvent<HTMLInputElement | HTMLTextAreaElement>): Promise<void> {
     const ref = terminalInput.current;
 
     // Run command or insert newline
@@ -427,7 +427,11 @@ export function TerminalInput(): React.ReactElement {
             setPossibilities([]);
             resetSearch();
           },
-          onKeyDown: onKeyDown,
+          onKeyDown: (event) => {
+            onKeyDown(event).catch((error) => {
+              console.error(error);
+            });
+          },
         }}
       ></TextField>
       <Popper
diff --git a/src/Terminal/ui/TerminalRoot.tsx b/src/Terminal/ui/TerminalRoot.tsx
index 404247a51f..0e33716d5e 100644
--- a/src/Terminal/ui/TerminalRoot.tsx
+++ b/src/Terminal/ui/TerminalRoot.tsx
@@ -41,7 +41,7 @@ export function TerminalRoot(): React.ReactElement {
   const [key, setKey] = useState(0);
 
   useEffect(() => {
-    const debounced = _.debounce(async () => rerender(), 25, { maxWait: 50 });
+    const debounced = _.debounce(() => rerender(), 25, { maxWait: 50 });
     const unsubscribe = TerminalEvents.subscribe(debounced);
     return () => {
       debounced.cancel();
@@ -51,7 +51,7 @@ export function TerminalRoot(): React.ReactElement {
 
   useEffect(() => {
     const clear = () => setKey((key) => key + 1);
-    const debounced = _.debounce(async () => clear(), 25, { maxWait: 50 });
+    const debounced = _.debounce(() => clear(), 25, { maxWait: 50 });
     const unsubscribe = TerminalClearEvents.subscribe(debounced);
     return () => {
       debounced.cancel();
diff --git a/src/data/codingcontracttypes.ts b/src/data/codingcontracttypes.ts
index 7480393317..41c5c6147e 100644
--- a/src/data/codingcontracttypes.ts
+++ b/src/data/codingcontracttypes.ts
@@ -917,7 +917,7 @@ export const codingContractTypesMetadata: CodingContractType<any>[] = [
     desc: (data: number[][]): string => {
       return [
         "You are located in the top-left corner of the following grid:\n\n",
-        `&nbsp;&nbsp;[${data.map((line) => "[" + line + "]").join(",\n&nbsp;&nbsp;&nbsp;")}]\n\n`,
+        `&nbsp;&nbsp;[${data.map((line) => `[${line}]`).join(",\n&nbsp;&nbsp;&nbsp;")}]\n\n`,
         "You are trying to find the shortest path to the bottom-right corner of the grid,",
         "but there are obstacles on the grid that you cannot move onto.",
         "These obstacles are denoted by '1', while empty spaces are denoted by 0.\n\n",
@@ -945,8 +945,8 @@ export const codingContractTypesMetadata: CodingContractType<any>[] = [
       const dstX = width - 1;
       const minPathLength = dstY + dstX; // Math.abs(dstY - srcY) + Math.abs(dstX - srcX)
 
-      const grid: number[][] = new Array(height);
-      for (let y = 0; y < height; y++) grid[y] = new Array(width).fill(0);
+      const grid: number[][] = new Array<number[]>(height);
+      for (let y = 0; y < height; y++) grid[y] = new Array<number>(width).fill(0);
 
       for (let y = 0; y < height; y++) {
         for (let x = 0; x < width; x++) {
@@ -969,12 +969,12 @@ export const codingContractTypesMetadata: CodingContractType<any>[] = [
       const dstY = height - 1;
       const dstX = width - 1;
 
-      const distance: [number][] = new Array(height);
+      const distance: number[][] = new Array<number[]>(height);
       //const prev: [[number, number] | undefined][] = new Array(height);
       const queue: [number, number][] = [];
 
       for (let y = 0; y < height; y++) {
-        distance[y] = new Array(width).fill(Infinity) as [number];
+        distance[y] = new Array<number>(width).fill(Infinity);
         //prev[y] = new Array(width).fill(undefined) as [undefined];
       }
 
@@ -1422,7 +1422,7 @@ export const codingContractTypesMetadata: CodingContractType<any>[] = [
       //Attempt to construct one to check if this is correct.
       if (sanitizedPlayerAns === "") {
         //Verify that there is no solution by attempting to create a proper 2-coloring.
-        const coloring: (number | undefined)[] = Array(data[0]).fill(undefined);
+        const coloring: (number | undefined)[] = Array<number | undefined>(data[0]).fill(undefined);
         while (coloring.some((val) => val === undefined)) {
           //Color a vertex in the graph
           const initialVertex: number = coloring.findIndex((val) => val === undefined);
@@ -1435,9 +1435,7 @@ export const codingContractTypesMetadata: CodingContractType<any>[] = [
             const neighbors: number[] = neighbourhood(v);
 
             //For each vertex u adjacent to v
-            for (const id in neighbors) {
-              const u: number = neighbors[id];
-
+            for (const u of neighbors) {
               //Set the color of u to the opposite of v's color if it is new,
               //then add u to the frontier to continue the algorithm.
               if (coloring[u] === undefined) {
diff --git a/src/ui/MD/a.tsx b/src/ui/MD/a.tsx
index 5ee0814a21..a3006e5f15 100644
--- a/src/ui/MD/a.tsx
+++ b/src/ui/MD/a.tsx
@@ -46,7 +46,7 @@ export const A = (props: React.PropsWithChildren<{ href?: string }>): React.Reac
           cursor: "pointer",
         }}
       >
-        <CorruptableText content={props.children + ""} spoiler={true} />
+        <CorruptableText content={String(props.children)} spoiler={true} />
       </span>
     );
   return (
diff --git a/src/ui/React/CharacterOverview.tsx b/src/ui/React/CharacterOverview.tsx
index 2c7b77de2a..3bf700569c 100644
--- a/src/ui/React/CharacterOverview.tsx
+++ b/src/ui/React/CharacterOverview.tsx
@@ -38,7 +38,7 @@ type RowName = SkillRowName | "HP" | "Money";
 const OverviewEventEmitter = new EventEmitter();
 
 // These values aren't displayed, they're just used for comparison to check if state has changed
-const valUpdaters: Record<RowName, () => any> = {
+const valUpdaters: Record<RowName, () => unknown> = {
   HP: () => Player.hp.current + "|" + Player.hp.max, // This isn't displayed, it's just compared for updates.
   Money: () => Player.money,
   Hack: () => Player.skills.hacking,
diff --git a/src/ui/React/CinematicLine.tsx b/src/ui/React/CinematicLine.tsx
index 757f7cdd13..61573c3530 100644
--- a/src/ui/React/CinematicLine.tsx
+++ b/src/ui/React/CinematicLine.tsx
@@ -26,9 +26,11 @@ export function CinematicLine(props: IProps): React.ReactElement {
       return;
     }
     let cancel = false;
-    (async () => {
-      await sleep(10).then(() => !cancel && advance());
-    })();
+    sleep(10)
+      .then(() => !cancel && advance())
+      .catch((error) => {
+        console.error(error);
+      });
     return () => {
       cancel = true;
     };
diff --git a/src/ui/React/ImportSave/ImportSave.tsx b/src/ui/React/ImportSave/ImportSave.tsx
index c55204a919..9bfe818e40 100644
--- a/src/ui/React/ImportSave/ImportSave.tsx
+++ b/src/ui/React/ImportSave/ImportSave.tsx
@@ -399,7 +399,11 @@ export const ImportSave = (props: { saveData: SaveData; automatic: boolean }): J
         <ConfirmationModal
           open={isImportModalOpen}
           onClose={closeImportModal}
-          onConfirm={handleImport}
+          onConfirm={() => {
+            handleImport().catch((error) => {
+              console.error(error);
+            });
+          }}
           confirmationText={
             <>
               Importing new save game data will <strong>completely wipe</strong> the current game data!
diff --git a/src/ui/React/LogBoxManager.tsx b/src/ui/React/LogBoxManager.tsx
index 6dab2ece7a..2ac73898a0 100644
--- a/src/ui/React/LogBoxManager.tsx
+++ b/src/ui/React/LogBoxManager.tsx
@@ -298,7 +298,16 @@ function LogWindow({ hidden, script, onClose }: LogWindowProps): React.ReactElem
     return !(bounds.right < 0 || bounds.bottom < 0 || bounds.left > innerWidth || bounds.top > outerWidth);
   };
 
-  const onDrag = (e: DraggableEvent): void | false => {
+  /**
+   * The returned type of onDrag is a bit weird here. The Draggable component expects an onDrag that returns "void | false".
+   * In that component's internal code, it checks for the explicit "false" value. If onDrag returns false, the component
+   * cancels the dragging.
+   *
+   * That's why they use "void | false" as the returned type. However, in TypeScript, "void" is not supposed to be used
+   * like that. ESLint will complain "void is not valid as a constituent in a union type". Please check its documentation
+   * for the reason. In order to solve this problem, I changed the returned type to "undefined | false".
+   */
+  const onDrag = (e: DraggableEvent): undefined | false => {
     e.preventDefault();
     // bound to body
     if (
diff --git a/src/ui/React/RecoveryRoot.tsx b/src/ui/React/RecoveryRoot.tsx
index 536c0115aa..3d95af1bae 100644
--- a/src/ui/React/RecoveryRoot.tsx
+++ b/src/ui/React/RecoveryRoot.tsx
@@ -98,7 +98,7 @@ export function RecoveryRoot({ softReset, errorData, resetError }: IProps): Reac
       {sourceError && (
         <Box>
           <Typography variant="h6" color={Settings.theme.error}>
-            Error: {sourceError.toString()}
+            Error: {String(sourceError)}
           </Typography>
           <br />
         </Box>
diff --git a/src/ui/React/Snackbar.tsx b/src/ui/React/Snackbar.tsx
index e7bb63a043..e5072dc505 100644
--- a/src/ui/React/Snackbar.tsx
+++ b/src/ui/React/Snackbar.tsx
@@ -14,7 +14,7 @@ interface IProps {
 const useStyles = makeStyles()({
   snackbar: {
     // Log popup z-index increments, so let's add a padding to be well above them.
-    zIndex: `${logBoxBaseZIndex + 1000} !important` as any,
+    zIndex: `${logBoxBaseZIndex + 1000} !important`,
 
     "& .MuiAlert-icon": {
       alignSelf: "center",
diff --git a/src/utils/CompressionContracts.ts b/src/utils/CompressionContracts.ts
index 64040ff68d..8c19c2df0e 100644
--- a/src/utils/CompressionContracts.ts
+++ b/src/utils/CompressionContracts.ts
@@ -1,4 +1,4 @@
-// choose random character for generating plaintexts to compress
+// choose random characters for generating plaintext to compress
 export function comprGenChar(): string {
   const r = Math.random();
   if (r < 0.4) {
@@ -34,13 +34,13 @@ export function comprLZGenerate(): string {
   return plain.substring(0, length);
 }
 
-// compress plaintest string
+// compress plaintext string
 export function comprLZEncode(plain: string): string {
   // for state[i][j]:
   //      if i is 0, we're adding a literal of length j
   //      else, we're adding a backreference of offset i and length j
-  let cur_state: (string | null)[][] = Array.from(Array(10), () => Array(10).fill(null));
-  let new_state: (string | null)[][] = Array.from(Array(10), () => Array(10));
+  let cur_state: (string | null)[][] = Array.from(Array(10), () => Array<string | null>(10).fill(null));
+  let new_state: (string | null)[][] = Array.from(Array(10), () => Array<string | null>(10));
 
   function set(state: (string | null)[][], i: number, j: number, str: string): void {
     const current = state[i][j];
diff --git a/src/utils/DeprecationHelper.ts b/src/utils/DeprecationHelper.ts
index 593bc3eff6..194b3c95be 100644
--- a/src/utils/DeprecationHelper.ts
+++ b/src/utils/DeprecationHelper.ts
@@ -3,7 +3,7 @@ import { Terminal } from "../Terminal";
 const deprecatedWarningsGiven = new Set();
 export function setDeprecatedProperties(
   obj: object,
-  properties: Record<string, { identifier: string; message: string; value: any }>,
+  properties: Record<string, { identifier: string; message: string; value: unknown }>,
 ) {
   for (const [name, info] of Object.entries(properties)) {
     Object.defineProperty(obj, name, {
@@ -11,7 +11,7 @@ export function setDeprecatedProperties(
         deprecationWarning(info.identifier, info.message);
         return info.value;
       },
-      set: (value: any) => (info.value = value),
+      set: (value: unknown) => (info.value = value),
       enumerable: true,
     });
   }
diff --git a/src/utils/EnumHelper.ts b/src/utils/EnumHelper.ts
index 350574cac7..723b184134 100644
--- a/src/utils/EnumHelper.ts
+++ b/src/utils/EnumHelper.ts
@@ -5,6 +5,7 @@ import * as allEnums from "../Enums";
 import { assertString } from "../Netscript/TypeAssertion";
 import { errorMessage } from "../Netscript/ErrorMessages";
 import { getRandomIntInclusive } from "./helpers/getRandomIntInclusive";
+import { getRecordValues } from "../Types/Record";
 
 interface GetMemberOptions {
   /** Whether to use fuzzy matching on the input (case insensitive, ignore spaces and dashes) */
@@ -22,7 +23,7 @@ class EnumHelper<EnumObj extends object, EnumMember extends Member<EnumObj> & st
   constructor(obj: EnumObj, name: string) {
     this.name = name;
     this.defaultArgName = name.charAt(0).toLowerCase() + name.slice(1);
-    this.valueArray = Object.values(obj);
+    this.valueArray = getRecordValues(obj);
     this.valueSet = new Set(this.valueArray);
     this.fuzzMap = new Map(this.valueArray.map((val) => [val.toLowerCase().replace(/[ -]+/g, ""), val]));
   }
diff --git a/src/utils/HammingCodeTools.ts b/src/utils/HammingCodeTools.ts
index 12a61754b1..d55ed75444 100644
--- a/src/utils/HammingCodeTools.ts
+++ b/src/utils/HammingCodeTools.ts
@@ -1,10 +1,10 @@
 export function HammingEncode(data: number): string {
   const enc: number[] = [0];
-  const data_bits: any[] = data.toString(2).split("").reverse();
-
-  data_bits.forEach((e, i, a) => {
-    a[i] = parseInt(e);
-  });
+  const data_bits: number[] = data
+    .toString(2)
+    .split("")
+    .reverse()
+    .map((value) => parseInt(value));
 
   let k = data_bits.length;
 
@@ -18,35 +18,36 @@ export function HammingEncode(data: number): string {
     }
   }
 
-  let parity: any = 0;
+  let parityNumber = 0;
 
   /* Figure out the subsection parities */
   for (let i = 0; i < enc.length; i++) {
     if (enc[i]) {
-      parity ^= i;
+      parityNumber ^= i;
     }
   }
 
-  parity = parity.toString(2).split("").reverse();
-  parity.forEach((e: any, i: any, a: any) => {
-    a[i] = parseInt(e);
-  });
+  const parityArray = parityNumber
+    .toString(2)
+    .split("")
+    .reverse()
+    .map((value) => parseInt(value));
 
   /* Set the parity bits accordingly */
-  for (let i = 0; i < parity.length; i++) {
-    enc[2 ** i] = parity[i] ? 1 : 0;
+  for (let i = 0; i < parityArray.length; i++) {
+    enc[2 ** i] = parityArray[i] ? 1 : 0;
   }
 
-  parity = 0;
+  parityNumber = 0;
   /* Figure out the overall parity for the entire block */
   for (let i = 0; i < enc.length; i++) {
     if (enc[i]) {
-      parity++;
+      parityNumber++;
     }
   }
 
   /* Finally set the overall parity bit */
-  enc[0] = parity % 2 == 0 ? 0 : 1;
+  enc[0] = parityNumber % 2 == 0 ? 0 : 1;
 
   return enc.join("");
 }
@@ -68,11 +69,11 @@ export function HammingEncodeProperly(data: number): string {
   const k: number = 2 ** m - m - 1;
 
   const enc: number[] = [0];
-  const data_bits: any[] = data.toString(2).split("").reverse();
-
-  data_bits.forEach((e, i, a) => {
-    a[i] = parseInt(e);
-  });
+  const data_bits: number[] = data
+    .toString(2)
+    .split("")
+    .reverse()
+    .map((value) => parseInt(value));
 
   /* Flip endianness as in the original implementation by Hedrauta
    * and write the data back to front
@@ -83,35 +84,36 @@ export function HammingEncodeProperly(data: number): string {
     }
   }
 
-  let parity: any = 0;
+  let parityNumber = 0;
 
   /* Figure out the subsection parities */
   for (let i = 0; i < n; i++) {
     if (enc[i]) {
-      parity ^= i;
+      parityNumber ^= i;
     }
   }
 
-  parity = parity.toString(2).split("").reverse();
-  parity.forEach((e: any, i: any, a: any) => {
-    a[i] = parseInt(e);
-  });
+  const parityArray = parityNumber
+    .toString(2)
+    .split("")
+    .reverse()
+    .map((value) => parseInt(value));
 
   /* Set the parity bits accordingly */
   for (let i = 0; i < m; i++) {
-    enc[2 ** i] = parity[i] ? 1 : 0;
+    enc[2 ** i] = parityArray[i] ? 1 : 0;
   }
 
-  parity = 0;
+  parityNumber = 0;
   /* Figure out the overall parity for the entire block */
   for (let i = 0; i < n; i++) {
     if (enc[i]) {
-      parity++;
+      parityNumber++;
     }
   }
 
   /* Finally set the overall parity bit */
-  enc[0] = parity % 2 == 0 ? 0 : 1;
+  enc[0] = parityNumber % 2 == 0 ? 0 : 1;
 
   return enc.join("");
 }
@@ -121,8 +123,9 @@ export function HammingDecode(data: string): number {
   const bits: number[] = [];
 
   /* TODO why not just work with an array of digits from the start? */
-  for (const i in data.split("")) {
-    const bit = parseInt(data[i]);
+  const bitStringArray = data.split("");
+  for (let i = 0; i < bitStringArray.length; ++i) {
+    const bit = parseInt(bitStringArray[i]);
     bits[i] = bit;
 
     if (bit) {
diff --git a/src/utils/StringHelperFunctions.ts b/src/utils/StringHelperFunctions.ts
index f0a4e7b00d..0c00766c45 100644
--- a/src/utils/StringHelperFunctions.ts
+++ b/src/utils/StringHelperFunctions.ts
@@ -125,3 +125,9 @@ export function getNsApiDocumentationUrl(isDevBranch: boolean = CONSTANTS.isDevB
     isDevBranch ? "dev" : "stable"
   }/markdown/bitburner.ns.md`;
 }
+
+export function getKeyFromReactElements(a: string | React.JSX.Element, b: string | React.JSX.Element): string {
+  const keyOfA = typeof a === "string" ? a : a.key ?? "";
+  const keyOfb = typeof b === "string" ? b : b.key ?? "";
+  return keyOfA + keyOfb;
+}
diff --git a/src/utils/helpers/throwIfReachable.ts b/src/utils/helpers/throwIfReachable.ts
new file mode 100644
index 0000000000..fe33b13454
--- /dev/null
+++ b/src/utils/helpers/throwIfReachable.ts
@@ -0,0 +1,3 @@
+export function throwIfReachable(missingCase: never) {
+  throw new Error(`The case of ${missingCase} was not handled.`);
+}