diff --git a/src/Bladeburner/data/Constants.ts b/src/Bladeburner/data/Constants.ts
index 27a1e413c..96151f7fc 100644
--- a/src/Bladeburner/data/Constants.ts
+++ b/src/Bladeburner/data/Constants.ts
@@ -1,33 +1,5 @@
 import { CityName } from "./../../Locations/data/CityNames";
-export const BladeburnerConstants: {
-  CityNames: string[];
-  CyclesPerSecond: number;
-  StaminaGainPerSecond: number;
-  BaseStaminaLoss: number;
-  MaxStaminaToGainFactor: number;
-  DifficultyToTimeFactor: number;
-  DiffMultExponentialFactor: number;
-  DiffMultLinearFactor: number;
-  EffAgiLinearFactor: number;
-  EffDexLinearFactor: number;
-  EffAgiExponentialFactor: number;
-  EffDexExponentialFactor: number;
-  BaseRecruitmentTimeNeeded: number;
-  PopulationThreshold: number;
-  PopulationExponent: number;
-  ChaosThreshold: number;
-  BaseStatGain: number;
-  BaseIntGain: number;
-  ActionCountGrowthPeriod: number;
-  RankToFactionRepFactor: number;
-  RankNeededForFaction: number;
-  ContractSuccessesPerLevel: number;
-  OperationSuccessesPerLevel: number;
-  RanksPerSkillPoint: number;
-  ContractBaseMoneyGain: number;
-  HrcHpGain: number;
-  HrcStaminaGain: number;
-} = {
+export const BladeburnerConstants = {
   CityNames: [
     CityName.Aevum,
     CityName.Chongqing,
diff --git a/src/Bladeburner/data/SkillNames.ts b/src/Bladeburner/data/SkillNames.ts
index 866ecac1f..7a0750633 100644
--- a/src/Bladeburner/data/SkillNames.ts
+++ b/src/Bladeburner/data/SkillNames.ts
@@ -1,19 +1,4 @@
-export const SkillNames: {
-  BladesIntuition: string;
-  Cloak: string;
-  Marksman: string;
-  WeaponProficiency: string;
-  ShortCircuit: string;
-  DigitalObserver: string;
-  Tracer: string;
-  Overclock: string;
-  Reaper: string;
-  EvasiveSystem: string;
-  Datamancer: string;
-  CybersEdge: string;
-  HandsOfMidas: string;
-  Hyperdrive: string;
-} = {
+export const SkillNames = {
   BladesIntuition: "Blade's Intuition",
   Cloak: "Cloak",
   Marksman: "Marksman",
diff --git a/src/Corporation/data/Constants.ts b/src/Corporation/data/Constants.ts
index e3ef5757e..776e50f3d 100644
--- a/src/Corporation/data/Constants.ts
+++ b/src/Corporation/data/Constants.ts
@@ -1,39 +1,7 @@
 import { CityName } from "./../../Locations/data/CityNames";
 const CyclesPerMarketCycle = 50;
 const AllCorporationStates = ["START", "PURCHASE", "PRODUCTION", "SALE", "EXPORT"];
-export const CorporationConstants: {
-  INITIALSHARES: number;
-  SHARESPERPRICEUPDATE: number;
-  IssueNewSharesCooldown: number;
-  SellSharesCooldown: number;
-  CyclesPerMarketCycle: number;
-  CyclesPerIndustryStateCycle: number;
-  SecsPerMarketCycle: number;
-  Cities: string[];
-  WarehouseInitialCost: number;
-  WarehouseInitialSize: number;
-  WarehouseUpgradeBaseCost: number;
-  OfficeInitialCost: number;
-  OfficeInitialSize: number;
-  OfficeUpgradeBaseCost: number;
-  BribeThreshold: number;
-  BribeToRepRatio: number;
-  ProductProductionCostRatio: number;
-  DividendMaxRate: number;
-  EmployeeSalaryMultiplier: number;
-  CyclesPerEmployeeRaise: number;
-  EmployeeRaiseAmount: number;
-  BaseMaxProducts: number;
-  AllCorporationStates: string[];
-  AllMaterials: string[];
-  AllIndustryTypes: string[];
-  AllUnlocks: string[];
-  AllUpgrades: string[];
-  AllResearch: string[];
-  FundingRoundShares: number[];
-  FundingRoundMultiplier: number[];
-  ValuationLength: number;
-} = {
+export const CorporationConstants = {
   INITIALSHARES: 1e9, //Total number of shares you have at your company
   SHARESPERPRICEUPDATE: 1e6, //When selling large number of shares, price is dynamically updated for every batch of this amount
   IssueNewSharesCooldown: 216e3, // 12 Hour in terms of game cycles
diff --git a/src/Corporation/ui/Context.ts b/src/Corporation/ui/Context.ts
index 42bcfcf72..5563110d5 100644
--- a/src/Corporation/ui/Context.ts
+++ b/src/Corporation/ui/Context.ts
@@ -2,10 +2,7 @@ import React, { useContext } from "react";
 import { Corporation } from "../Corporation";
 import { Industry } from "../Industry";
 
-export const Context: {
-  Corporation: React.Context<Corporation>;
-  Division: React.Context<Industry>;
-} = {
+export const Context = {
   Corporation: React.createContext<Corporation>({} as Corporation),
   Division: React.createContext<Industry>({} as Industry),
 };
diff --git a/src/CotMG/data/Constants.ts b/src/CotMG/data/Constants.ts
index c8e42eb0b..578aac1e1 100644
--- a/src/CotMG/data/Constants.ts
+++ b/src/CotMG/data/Constants.ts
@@ -1,8 +1,4 @@
-export const StanekConstants: {
-  RAMBonus: number;
-  BaseSize: number;
-  MaxSize: number;
-} = {
+export const StanekConstants = {
   RAMBonus: 0.1,
   BaseSize: 9,
   MaxSize: 25,
diff --git a/src/Gang/Gang.ts b/src/Gang/Gang.ts
index 1e29d2cd8..3f7449d02 100644
--- a/src/Gang/Gang.ts
+++ b/src/Gang/Gang.ts
@@ -25,9 +25,8 @@ import { GangMember } from "./GangMember";
 import { WorkerScript } from "../Netscript/WorkerScript";
 import { Player } from "../Player";
 import { PowerMultiplier } from "./data/power";
-import { IGang } from "./IGang";
 
-export class Gang implements IGang {
+export class Gang {
   facName: string;
   members: GangMember[];
   wanted: number;
diff --git a/src/Gang/GangMember.ts b/src/Gang/GangMember.ts
index 80c745e64..177b10f8d 100644
--- a/src/Gang/GangMember.ts
+++ b/src/Gang/GangMember.ts
@@ -4,7 +4,7 @@ import { GangMemberUpgrade } from "./GangMemberUpgrade";
 import { GangMemberUpgrades } from "./GangMemberUpgrades";
 import { IAscensionResult } from "./IAscensionResult";
 import { Player } from "../Player";
-import { IGang } from "./IGang";
+import { Gang } from "./Gang";
 import { Generic_fromJSON, Generic_toJSON, IReviverValue, Reviver } from "../utils/JSONReviver";
 import {
   calculateRespectGain,
@@ -111,7 +111,7 @@ export class GangMember {
     return GangMemberTasks["Unassigned"];
   }
 
-  calculateRespectGain(gang: IGang): number {
+  calculateRespectGain(gang: Gang): number {
     const task = this.getTask();
     const g = {
       respect: gang.respect,
@@ -121,7 +121,7 @@ export class GangMember {
     return calculateRespectGain(g, this, task);
   }
 
-  calculateWantedLevelGain(gang: IGang): number {
+  calculateWantedLevelGain(gang: Gang): number {
     const task = this.getTask();
     const g = {
       respect: gang.respect,
@@ -131,7 +131,7 @@ export class GangMember {
     return calculateWantedLevelGain(g, this, task);
   }
 
-  calculateMoneyGain(gang: IGang): number {
+  calculateMoneyGain(gang: Gang): number {
     const task = this.getTask();
     const g = {
       respect: gang.respect,
@@ -191,7 +191,7 @@ export class GangMember {
       this.calculateAscensionMult(this.cha_asc_points);
   }
 
-  recordEarnedRespect(numCycles = 1, gang: IGang): void {
+  recordEarnedRespect(numCycles = 1, gang: Gang): void {
     this.earnedRespect += this.calculateRespectGain(gang) * numCycles;
   }
 
diff --git a/src/Gang/IGang.ts b/src/Gang/IGang.ts
deleted file mode 100644
index e2037534d..000000000
--- a/src/Gang/IGang.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-import { GangMemberUpgrade } from "./GangMemberUpgrade";
-import { GangMember } from "./GangMember";
-import { WorkerScript } from "../Netscript/WorkerScript";
-import { IAscensionResult } from "./IAscensionResult";
-import { IReviverValue } from "src/utils/JSONReviver";
-
-export interface IGang {
-  facName: string;
-  members: GangMember[];
-  wanted: number;
-  respect: number;
-
-  isHackingGang: boolean;
-
-  respectGainRate: number;
-  wantedGainRate: number;
-  moneyGainRate: number;
-
-  storedCycles: number;
-
-  storedTerritoryAndPowerCycles: number;
-
-  territoryClashChance: number;
-  territoryWarfareEngaged: boolean;
-
-  notifyMemberDeath: boolean;
-
-  getPower(): number;
-  getTerritory(): number;
-  process(numCycles: number): void;
-  processGains(numCycles: number): void;
-  processTerritoryAndPowerGains(numCycles: number): void;
-  processExperienceGains(numCycles: number): void;
-  clash(won: boolean): void;
-  canRecruitMember(): boolean;
-  getRespectNeededToRecruitMember(): number;
-  recruitMember(name: string): boolean;
-  getWantedPenalty(): number;
-  calculatePower(): number;
-  killMember(member: GangMember): void;
-  ascendMember(member: GangMember, workerScript?: WorkerScript): IAscensionResult;
-  getDiscount(): number;
-  getAllTaskNames(): string[];
-  getUpgradeCost(upg: GangMemberUpgrade): number;
-  toJSON(): IReviverValue;
-}
diff --git a/src/Gang/data/Constants.ts b/src/Gang/data/Constants.ts
index 6d3ada486..fb4eaea00 100644
--- a/src/Gang/data/Constants.ts
+++ b/src/Gang/data/Constants.ts
@@ -1,13 +1,6 @@
 import { FactionNames } from "../../Faction/data/FactionNames";
 
-export const GangConstants: {
-  GangRespectToReputationRatio: number;
-  MaximumGangMembers: number;
-  CyclesPerTerritoryAndPowerUpdate: number;
-  AscensionMultiplierRatio: number;
-  Names: string[];
-  GangKarmaRequirement: number;
-} = {
+export const GangConstants = {
   // Respect is divided by this to get rep gain
   GangRespectToReputationRatio: 75,
   MaximumGangMembers: 12,
diff --git a/src/Gang/ui/Context.ts b/src/Gang/ui/Context.ts
index 267cf43d5..a968e90e8 100644
--- a/src/Gang/ui/Context.ts
+++ b/src/Gang/ui/Context.ts
@@ -1,10 +1,8 @@
 import React, { useContext } from "react";
-import { IGang } from "../IGang";
+import { Gang } from "../Gang";
 
-export const Context: {
-  Gang: React.Context<IGang>;
-} = {
-  Gang: React.createContext<IGang>({} as IGang),
+export const Context = {
+  Gang: React.createContext<Gang>({} as Gang),
 };
 
-export const useGang = (): IGang => useContext(Context.Gang);
+export const useGang = (): Gang => useContext(Context.Gang);
diff --git a/src/Hacknet/data/Constants.ts b/src/Hacknet/data/Constants.ts
index 9d675eaea..db7b2f24f 100644
--- a/src/Hacknet/data/Constants.ts
+++ b/src/Hacknet/data/Constants.ts
@@ -1,23 +1,4 @@
-export const HacknetNodeConstants: {
-  // Constants for Hacknet Node production
-  MoneyGainPerLevel: number;
-
-  // Constants for Hacknet Node purchase/upgrade costs
-  BaseCost: number;
-  LevelBaseCost: number;
-  RamBaseCost: number;
-  CoreBaseCost: number;
-
-  PurchaseNextMult: number;
-  UpgradeLevelMult: number;
-  UpgradeRamMult: number;
-  UpgradeCoreMult: number;
-
-  // Constants for max upgrade levels for Hacknet Nodes
-  MaxLevel: number;
-  MaxRam: number;
-  MaxCores: number;
-} = {
+export const HacknetNodeConstants = {
   MoneyGainPerLevel: 1.5,
 
   BaseCost: 1000,
@@ -48,29 +29,7 @@ export const PurchaseMultipliers: {
   MAX: "MAX",
 };
 
-export const HacknetServerConstants: {
-  // Constants for Hacknet Server stats/production
-  HashesPerLevel: number;
-
-  // Constants for Hacknet Server purchase/upgrade costs
-  BaseCost: number;
-  RamBaseCost: number;
-  CoreBaseCost: number;
-  CacheBaseCost: number;
-
-  PurchaseMult: number; // Multiplier for puchasing an additional Hacknet Server
-  UpgradeLevelMult: number; // Multiplier for cost when upgrading level
-  UpgradeRamMult: number; // Multiplier for cost when upgrading RAM
-  UpgradeCoreMult: number; // Multiplier for cost when buying another core
-  UpgradeCacheMult: number; // Multiplier for cost when upgrading cache
-  MaxServers: number; // Max number of Hacknet Servers you can own
-
-  // Constants for max upgrade levels for Hacknet Server
-  MaxLevel: number;
-  MaxRam: number;
-  MaxCores: number;
-  MaxCache: number;
-} = {
+export const HacknetServerConstants = {
   HashesPerLevel: 0.001,
 
   BaseCost: 50e3,
diff --git a/src/InteractiveTutorial.ts b/src/InteractiveTutorial.ts
index 2d7b16848..aec7c03ac 100644
--- a/src/InteractiveTutorial.ts
+++ b/src/InteractiveTutorial.ts
@@ -39,43 +39,7 @@ enum iTutorialSteps {
   End,
 }
 
-const ITutorial: {
-  currStep: iTutorialSteps;
-  isRunning: boolean;
-  stepIsDone: {
-    [iTutorialSteps.Start]: boolean;
-    [iTutorialSteps.NSSelection]: boolean;
-    [iTutorialSteps.GoToCharacterPage]: boolean;
-    [iTutorialSteps.CharacterPage]: boolean;
-    [iTutorialSteps.CharacterGoToTerminalPage]: boolean;
-    [iTutorialSteps.TerminalIntro]: boolean;
-    [iTutorialSteps.TerminalHelp]: boolean;
-    [iTutorialSteps.TerminalLs]: boolean;
-    [iTutorialSteps.TerminalScan]: boolean;
-    [iTutorialSteps.TerminalScanAnalyze1]: boolean;
-    [iTutorialSteps.TerminalScanAnalyze2]: boolean;
-    [iTutorialSteps.TerminalConnect]: boolean;
-    [iTutorialSteps.TerminalAnalyze]: boolean;
-    [iTutorialSteps.TerminalNuke]: boolean;
-    [iTutorialSteps.TerminalManualHack]: boolean;
-    [iTutorialSteps.TerminalHackingMechanics]: boolean;
-    [iTutorialSteps.TerminalGoHome]: boolean;
-    [iTutorialSteps.TerminalCreateScript]: boolean;
-    [iTutorialSteps.TerminalTypeScript]: boolean;
-    [iTutorialSteps.TerminalFree]: boolean;
-    [iTutorialSteps.TerminalRunScript]: boolean;
-    [iTutorialSteps.TerminalGoToActiveScriptsPage]: boolean;
-    [iTutorialSteps.ActiveScriptsPage]: boolean;
-    [iTutorialSteps.ActiveScriptsToTerminal]: boolean;
-    [iTutorialSteps.TerminalTailScript]: boolean;
-    [iTutorialSteps.GoToHacknetNodesPage]: boolean;
-    [iTutorialSteps.HacknetNodesIntroduction]: boolean;
-    [iTutorialSteps.HacknetNodesGoToWorldPage]: boolean;
-    [iTutorialSteps.WorldDescription]: boolean;
-    [iTutorialSteps.TutorialPageInfo]: boolean;
-    [iTutorialSteps.End]: boolean;
-  };
-} = {
+const ITutorial = {
   currStep: iTutorialSteps.Start,
   isRunning: false,
 
@@ -141,7 +105,9 @@ function iTutorialPrevStep(): void {
 function iTutorialEnd(): void {
   ITutorial.isRunning = false;
   ITutorial.currStep = iTutorialSteps.Start;
-  Player.getHomeComputer().messages.push(LiteratureNames.HackersStartingHandbook);
+  const messages = Player.getHomeComputer().messages;
+  const handbook = LiteratureNames.HackersStartingHandbook;
+  if (!messages.includes(handbook)) messages.push(handbook);
   ITutorialEvents.emit();
 }
 
diff --git a/src/PersonObjects/Player/PlayerObject.ts b/src/PersonObjects/Player/PlayerObject.ts
index 0dff3a48f..d193e13f1 100644
--- a/src/PersonObjects/Player/PlayerObject.ts
+++ b/src/PersonObjects/Player/PlayerObject.ts
@@ -8,13 +8,13 @@ import * as workMethods from "./PlayerObjectWorkMethods";
 
 import { IMap } from "../../types";
 import { Sleeve } from "../Sleeve/Sleeve";
-import { IPlayerOwnedSourceFile } from "../../SourceFile/PlayerOwnedSourceFile";
+import { PlayerOwnedSourceFile } from "../../SourceFile/PlayerOwnedSourceFile";
 import { Exploit } from "../../Exploits/Exploit";
 
 import { LocationName } from "../../Locations/data/LocationNames";
 import { IPlayerOwnedAugmentation } from "../../Augmentation/PlayerOwnedAugmentation";
 import { Corporation } from "../../Corporation/Corporation";
-import { IGang } from "../../Gang/IGang";
+import { Gang } from "../../Gang/Gang";
 import { Bladeburner } from "../../Bladeburner/Bladeburner";
 import { HacknetNode } from "../../Hacknet/HacknetNode";
 
@@ -33,7 +33,7 @@ export class PlayerObject extends Person {
   // Player-specific properties
   bitNodeN = 1; //current bitnode
   corporation: Corporation | null = null;
-  gang: IGang | null = null;
+  gang: Gang | null = null;
   bladeburner: Bladeburner | null = null;
   currentServer = "";
   factions: string[] = [];
@@ -58,7 +58,7 @@ export class PlayerObject extends Person {
   scriptProdSinceLastAug = 0;
   sleeves: Sleeve[] = [];
   sleevesFromCovenant = 0;
-  sourceFiles: IPlayerOwnedSourceFile[] = [];
+  sourceFiles: PlayerOwnedSourceFile[] = [];
   exploits: Exploit[] = [];
   achievements: PlayerAchievement[] = [];
   terminalCommandHistory: string[] = [];
diff --git a/src/SourceFile/PlayerOwnedSourceFile.ts b/src/SourceFile/PlayerOwnedSourceFile.ts
index 1d6374c1b..55d99667f 100644
--- a/src/SourceFile/PlayerOwnedSourceFile.ts
+++ b/src/SourceFile/PlayerOwnedSourceFile.ts
@@ -10,8 +10,3 @@ export class PlayerOwnedSourceFile {
     this.lvl = level;
   }
 }
-
-export interface IPlayerOwnedSourceFile {
-  lvl: number;
-  n: number;
-}