Added nullable to most Content.Shared files (#3238)

* Add nullable to some Content.Shared files.

* Use [NotNullWhen(true)]

* Undo adding now redundant !'s

* Forgot one

* Add a ton more nullable

* You can guess

* Fix some issues

* It actually compiles now

* Auto stash before merge of "null2" and "origin/master"

* I lied

* enable annotations -> enable

* Revert ActionBlockerSystem.cs to original

* Fix ActionBlockerSystem.cs

* More nullable

* Undo some added exclamation marks

* Fix issues

* Update Content.Shared/Maps/ContentTileDefinition.cs

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

* Resolve some issues

* Remove unused method

* Fix more issues

* Fix more issues

* Fix more issues

* Fix more issues

* Fix issue, rollback SharedGhostComponent.cs

* Update submodule

* Fix issue, invert some if-statements to reduce nesting

* Revert RobustToolbox

* FIx things broken by merge

* Some fixes

- Replaced with string.Empty
- Remove some exclamation marks
- Revert file

* Some fixes

* Trivial #nullable enable

* Fix null ables

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Shared/GameObjects/Components/Access/SharedIdCardConsoleComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using System.Collections.Generic;
 using Robust.Shared.GameObjects;
@@ -49,16 +50,16 @@ namespace Content.Shared.GameObjects.Components.Access
             public readonly bool IsPrivilegedIdAuthorized;
             public readonly bool IsTargetIdPresent;
             public readonly string TargetIdName;
-            public readonly string TargetIdFullName;
-            public readonly string TargetIdJobTitle;
-            public readonly string[] TargetIdAccessList;
+            public readonly string? TargetIdFullName;
+            public readonly string? TargetIdJobTitle;
+            public readonly string[]? TargetIdAccessList;
 
             public IdCardConsoleBoundUserInterfaceState(bool isPrivilegedIdPresent,
                 bool isPrivilegedIdAuthorized,
                 bool isTargetIdPresent,
-                string targetIdFullName,
-                string targetIdJobTitle,
-                string[] targetIdAccessList, string privilegedIdName, string targetIdName)
+                string? targetIdFullName,
+                string? targetIdJobTitle,
+                string[]? targetIdAccessList, string privilegedIdName, string targetIdName)
             {
                 IsPrivilegedIdPresent = isPrivilegedIdPresent;
                 IsPrivilegedIdAuthorized = isPrivilegedIdAuthorized;

Content.Shared/GameObjects/Components/ActionBlocking/SharedHandcuffComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 
@@ -12,9 +13,9 @@ namespace Content.Shared.GameObjects.Components.ActionBlocking
         [Serializable, NetSerializable]
         protected sealed class HandcuffedComponentState : ComponentState
         {
-            public string IconState { get; }
+            public string? IconState { get; }
 
-            public HandcuffedComponentState(string iconState) : base(ContentNetIDs.HANDCUFFS)
+            public HandcuffedComponentState(string? iconState) : base(ContentNetIDs.HANDCUFFS)
             {
                 IconState = iconState;
             }

Content.Shared/GameObjects/Components/Actor/SharedCharacterInfoComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.Objectives;
 using Robust.Shared.GameObjects;

Content.Shared/GameObjects/Components/Arcade/SharedSpaceVillainArcadeComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/GasTank/GasTankBoundUserInterfaceState.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/GasTank/GasTankSetPressureMessage.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/GasTank/GasTankToggleInternalsMessage.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/GasTank/SharedGasTankComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Atmos.GasTank
 {

Content.Shared/GameObjects/Components/Atmos/GasTank/SharedGasTankUiKey.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Atmos.GasTank

Content.Shared/GameObjects/Components/Atmos/SharedFlammableComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/SharedGasAnalyzerComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.Serialization;
+#nullable enable
+using Robust.Shared.Serialization;
 using System;
 
 namespace Content.Shared.GameObjects.Components.Atmos

Content.Shared/GameObjects/Components/Atmos/SharedGasCanisterComponent.cs

@@ -1,4 +1,4 @@
-#nullable enable annotations
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Atmos/SharedPipeComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.Maths;
 using Robust.Shared.Serialization;
 using System;

Content.Shared/GameObjects/Components/Atmos/SharedPumpComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Atmos/SharedSiphonComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Atmos

Content.Shared/GameObjects/Components/Atmos/SharedVentComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Atmos

Content.Shared/GameObjects/Components/Body/Networks/SharedBloodstreamComponent.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Chemistry;
+#nullable enable
+using Content.Shared.Chemistry;
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Body.Networks

Content.Shared/GameObjects/Components/Body/Part/BodyPartCompatibility.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part

Content.Shared/GameObjects/Components/Body/Part/BodyPartSymmetry.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part

Content.Shared/GameObjects/Components/Body/Part/BodyPartType.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part

Content.Shared/GameObjects/Components/Body/Part/IBodyPartAdded.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Body.Part

Content.Shared/GameObjects/Components/Body/Part/IBodyPartContainer.cs

@@ -1,4 +1,6 @@
-namespace Content.Shared.GameObjects.Components.Body.Part
+#nullable enable
+
+namespace Content.Shared.GameObjects.Components.Body.Part
 {
     /// <summary>
     ///     Defines a component as being capable of containing parts.

Content.Shared/GameObjects/Components/Body/Part/IBodyPartRemoved.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 
 namespace Content.Shared.GameObjects.Components.Body.Part
 {

Content.Shared/GameObjects/Components/Body/Part/Property/BodyPartPropertyComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part.Property

Content.Shared/GameObjects/Components/Body/Part/Property/ExtensionComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part.Property

Content.Shared/GameObjects/Components/Body/Part/Property/GraspComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Body.Part.Property
 {

Content.Shared/GameObjects/Components/Body/Part/Property/IBodyPartProperty.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Body.Part.Property
 {

Content.Shared/GameObjects/Components/Body/Part/Property/LegComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Part.Property

Content.Shared/GameObjects/Components/Body/Preset/BodyPresetPrototype.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.GameObjects.Components.Body.Part;
 using Robust.Shared.Prototypes;
@@ -15,9 +16,9 @@ namespace Content.Shared.GameObjects.Components.Body.Preset
     [Serializable, NetSerializable]
     public class BodyPresetPrototype : IPrototype
     {
-        private string _id;
-        private string _name;
-        private Dictionary<string, string> _partIDs;
+        private string _id = string.Empty;
+        private string _name = string.Empty;
+        private Dictionary<string, string> _partIDs = new();
 
         [ViewVariables] public string ID => _id;
 

Content.Shared/GameObjects/Components/Body/Surgery/SurgeryType.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Surgery

Content.Shared/GameObjects/Components/Body/Surgery/SurgeryUIKey.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Body.Surgery

Content.Shared/GameObjects/Components/Body/Surgery/SurgeryUIMessages.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Body/Template/BodyTemplatePrototype.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Content.Shared.GameObjects.Components.Body.Part;
@@ -16,13 +17,13 @@ namespace Content.Shared.GameObjects.Components.Body.Template
     [Serializable, NetSerializable]
     public class BodyTemplatePrototype : IPrototype
     {
-        private string _id;
-        private string _name;
-        private string _centerSlot;
-        private Dictionary<string, BodyPartType> _slots;
-        private Dictionary<string, List<string>> _connections;
-        private Dictionary<string, string> _layers;
-        private Dictionary<string, string> _mechanismLayers;
+        private string _id = string.Empty;
+        private string _name = string.Empty;
+        private string _centerSlot = string.Empty;
+        private Dictionary<string, BodyPartType> _slots = new();
+        private Dictionary<string, List<string>> _connections = new();
+        private Dictionary<string, string> _layers = new();
+        private Dictionary<string, string> _mechanismLayers = new();
 
         [ViewVariables] public string ID => _id;
 

Content.Shared/GameObjects/Components/Botany/PlantHolderVisuals.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Botany

Content.Shared/GameObjects/Components/Buckle/SharedBuckleComponent.cs

@@ -44,7 +44,7 @@ namespace Content.Shared.GameObjects.Components.Buckle
 
         public bool DontCollide { get; set; }
 
-        public abstract bool TryBuckle(IEntity user, IEntity to);
+        public abstract bool TryBuckle(IEntity? user, IEntity to);
 
         bool ICollideSpecial.PreventCollide(IPhysBody collidedwith)
         {

Content.Shared/GameObjects/Components/Cargo/SharedCargoConsoleComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Prototypes;

Content.Shared/GameObjects/Components/Cargo/SharedCargoOrderDatabaseComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.Prototypes.Cargo;
 using Robust.Shared.GameObjects;

Content.Shared/GameObjects/Components/Cargo/SharedGalacticMarketComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using Content.Shared.Prototypes.Cargo;
@@ -35,10 +36,10 @@ namespace Content.Shared.GameObjects.Components.Cargo
         ///     Returns a product from the string id;
         /// </summary>
         /// <returns>Product</returns>
-        public CargoProductPrototype GetProduct(string productId)
+        public CargoProductPrototype? GetProduct(string productId)
         {
             var prototypeManager = IoCManager.Resolve<IPrototypeManager>();
-            if (!prototypeManager.TryIndex(productId, out CargoProductPrototype product) || !_products.Contains(product))
+            if (!prototypeManager.TryIndex(productId, out CargoProductPrototype? product) || !_products.Contains(product))
             {
                 return null;
             }
@@ -75,7 +76,7 @@ namespace Content.Shared.GameObjects.Components.Cargo
                     _products.Clear();
                     foreach (var id in products)
                     {
-                        if (!prototypeManager.TryIndex(id, out CargoProductPrototype product))
+                        if (!prototypeManager.TryIndex(id, out CargoProductPrototype? product))
                         {
                             continue;
                         }

Content.Shared/GameObjects/Components/Chemistry/ISolutionInteractionsComponent.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Chemistry;
+#nullable enable
+using Content.Shared.Chemistry;
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Chemistry

Content.Shared/GameObjects/Components/Chemistry/ReagentDispenser/ReagentDispenserInventoryPrototype.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;
@@ -15,8 +16,8 @@ namespace Content.Shared.GameObjects.Components.Chemistry.ReagentDispenser
     [Serializable, NetSerializable, Prototype("reagentDispenserInventory")]
     public class ReagentDispenserInventoryPrototype : IPrototype
     {
-        private string _id;
-        private List<string> _inventory;
+        private string _id = string.Empty;
+        private List<string> _inventory = new();
 
         public string ID => _id;
         public List<string> Inventory => _inventory;

Content.Shared/GameObjects/Components/Chemistry/ReagentDispenser/SharedReagentDispenserComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.Chemistry;
 using Robust.Shared.GameObjects;
@@ -36,12 +37,12 @@ namespace Content.Shared.GameObjects.Components.Chemistry.ReagentDispenser
             /// <summary>
             /// A list of the reagents and their amounts within the beaker/reagent container, if applicable.
             /// </summary>
-            public readonly List<Solution.ReagentQuantity> ContainerReagents;
+            public readonly List<Solution.ReagentQuantity>? ContainerReagents;
             public readonly string DispenserName;
             public readonly ReagentUnit SelectedDispenseAmount;
 
             public ReagentDispenserBoundUserInterfaceState(bool hasPower, bool hasBeaker, ReagentUnit beakerCurrentVolume, ReagentUnit beakerMaxVolume, string containerName,
-                List<ReagentDispenserInventoryEntry> inventory, string dispenserName, List<Solution.ReagentQuantity> containerReagents, ReagentUnit selectedDispenseAmount)
+                List<ReagentDispenserInventoryEntry> inventory, string dispenserName, List<Solution.ReagentQuantity>? containerReagents, ReagentUnit selectedDispenseAmount)
             {
                 HasPower = hasPower;
                 HasBeaker = hasBeaker;

Content.Shared/GameObjects/Components/Chemistry/SharedHyposprayComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Content.Shared.Chemistry;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Chemistry/SharedInjectorComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Content.Shared.Chemistry;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Command/SharedCommunicationsConsoleComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Construction/MachineFrameVisuals.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.Serialization;
+#nullable enable
+using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Construction
 {

Content.Shared/GameObjects/Components/Context/HideContextMenuComponent.cs

@@ -1,4 +1,5 @@
-using Content.Shared.GameObjects.Verbs;
+#nullable enable
+using Content.Shared.GameObjects.Verbs;
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Context

Content.Shared/GameObjects/Components/Conveyor/SharedConveyorComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Conveyor

Content.Shared/GameObjects/Components/Damage/DamageChangeData.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Damage;
+#nullable enable
+using Content.Shared.Damage;
 
 namespace Content.Shared.GameObjects.Components.Damage
 {

Content.Shared/GameObjects/Components/Damage/DamageChangeParams.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Content.Shared.GameObjects.Components.Body;
 
 namespace Content.Shared.GameObjects.Components.Damage

Content.Shared/GameObjects/Components/Damage/DamageChangedEventArgs.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.Damage;
 

Content.Shared/GameObjects/Components/Damage/DamageChangedMessage.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+#nullable enable
+using System.Collections.Generic;
 using Content.Shared.Damage;
 using Robust.Shared.GameObjects;
 

Content.Shared/GameObjects/Components/Damage/DamageFlag.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Damage

Content.Shared/GameObjects/Components/Disposal/SharedDisposalMailingUnitComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
@@ -37,10 +38,10 @@ namespace Content.Shared.GameObjects.Components.Disposal
             public readonly bool Engaged;
             public readonly string Tag;
             public readonly List<string> Tags;
-            public readonly string Target;
+            public readonly string? Target;
 
             public DisposalMailingUnitBoundUserInterfaceState(string unitName, string unitState, float pressure, bool powered,
-                bool engaged, string tag, List<string> tags, string target)
+                bool engaged, string tag, List<string> tags, string? target)
             {
                 UnitName = unitName;
                 UnitState = unitState;
@@ -57,7 +58,7 @@ namespace Content.Shared.GameObjects.Components.Disposal
                 return new DisposalMailingUnitBoundUserInterfaceState(UnitName, UnitState, Pressure, Powered, Engaged, Tag, (List<string>)Tags.Clone(), Target);
             }
 
-            public bool Equals(DisposalMailingUnitBoundUserInterfaceState other)
+            public bool Equals(DisposalMailingUnitBoundUserInterfaceState? other)
             {
                 if (other is null) return false;
                 if (ReferenceEquals(this, other)) return true;
@@ -91,9 +92,9 @@ namespace Content.Shared.GameObjects.Components.Disposal
         [Serializable, NetSerializable]
         public class UiTargetUpdateMessage : BoundUserInterfaceMessage
         {
-            public readonly string Target;
+            public readonly string? Target;
 
-            public UiTargetUpdateMessage(string target)
+            public UiTargetUpdateMessage(string? target)
             {
                 Target = target;
             }

Content.Shared/GameObjects/Components/Disposal/SharedDisposalRouterComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Text.RegularExpressions;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Disposal/SharedDisposalTubeComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Disposal

Content.Shared/GameObjects/Components/Doors/AirlockWireStatus.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Doors

Content.Shared/GameObjects/Components/Explosion/SharedClusterFlashComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/ExtinguisherCabinet.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components

Content.Shared/GameObjects/Components/Fluids/SharedSprayComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/GUI/SharedStrippableComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.GameObjects.Components.Items;
 using Content.Shared.GameObjects.EntitySystems.ActionBlocker;

Content.Shared/GameObjects/Components/Gravity/SharedGravityGeneratorComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Instruments/SharedInstrumentComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.Audio.Midi;
 using Robust.Shared.GameObjects;

Content.Shared/GameObjects/Components/Interactable/SharedToolComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Inventory/EquipmentSlotDefinitions.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using JetBrains.Annotations;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Inventory/InventoryTemplates.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+#nullable enable
+using System.Collections.Generic;
 using JetBrains.Annotations;
 using static Content.Shared.GameObjects.Components.Inventory.EquipmentSlotDefines;
 

Content.Shared/GameObjects/Components/Items/ClothingComponentState.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Items

Content.Shared/GameObjects/Components/Items/IItemComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Items

Content.Shared/GameObjects/Components/Items/ISharedHandsComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Items
 {

Content.Shared/GameObjects/Components/Items/ItemComponentState.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Items/ItemCooldownComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Players;
 using Robust.Shared.Serialization;
@@ -61,7 +62,7 @@ namespace Content.Shared.GameObjects.Components.Items
             };
         }
 
-        public override void HandleComponentState(ComponentState curState, ComponentState nextState)
+        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
         {
             base.HandleComponentState(curState, nextState);
 

Content.Shared/GameObjects/Components/MachineLinking/TwoWayLeverSignal.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.MachineLinking

Content.Shared/GameObjects/Components/Markers/SharedSpawnPointComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.GameObjects;
 
 namespace Content.Shared.GameObjects.Components.Markers

Content.Shared/GameObjects/Components/Medical/SharedCloningPodComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Medical/SharedMedicalScannerComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using System.Collections.Generic;
 using Content.Shared.Damage;

Content.Shared/GameObjects/Components/Mobs/DamageStateHelpers.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 
 namespace Content.Shared.GameObjects.Components.Mobs

Content.Shared/GameObjects/Components/Mobs/DamageStateVisuals.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Mobs/ExaminerComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;

Content.Shared/GameObjects/Components/Mobs/IActionAttempt.cs

@@ -1,5 +1,4 @@
 #nullable enable
-
 using Content.Shared.Actions;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Input.Binding;

Content.Shared/GameObjects/Components/Mobs/SharedAlertsComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using Content.Shared.Alert;
 using Robust.Shared.GameObjects;
@@ -24,7 +25,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
 
         [ViewVariables] private Dictionary<AlertKey, AlertState> _alerts = new();
 
-        public override void HandleComponentState(ComponentState curState, ComponentState nextState)
+        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
         {
             base.HandleComponentState(curState, nextState);
 

Content.Shared/GameObjects/Components/Mobs/SharedCameraRecoilComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Maths;

Content.Shared/GameObjects/Components/Mobs/SharedCombatModeComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Players;
@@ -36,7 +37,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
             }
         }
 
-        public override void HandleComponentState(ComponentState curState, ComponentState nextState)
+        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
         {
             base.HandleComponentState(curState, nextState);
 

Content.Shared/GameObjects/Components/Mobs/SharedHumanoidAppearanceComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Content.Shared.Preferences;
 using Robust.Shared.Enums;
@@ -10,7 +11,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
 {
     public abstract class SharedHumanoidAppearanceComponent : Component
     {
-        private HumanoidCharacterAppearance _appearance;
+        private HumanoidCharacterAppearance _appearance = default!;
         private Sex _sex;
         private Gender _gender;
 
@@ -55,7 +56,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
             return new HumanoidAppearanceComponentState(Appearance, Sex, Gender);
         }
 
-        public override void HandleComponentState(ComponentState curState, ComponentState nextState)
+        public override void HandleComponentState(ComponentState? curState, ComponentState? nextState)
         {
             base.HandleComponentState(curState, nextState);
 

Content.Shared/GameObjects/Components/Mobs/SharedStunnableComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using System.Threading;
 using Content.Shared.Alert;
@@ -40,7 +41,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
         protected float KnockdownTimer;
         protected float SlowdownTimer;
 
-        private string _stunAlertId;
+        private string _stunAlertId = string.Empty;
 
         protected CancellationTokenSource StatusRemoveCancellation = new();
 
@@ -182,7 +183,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
             SlowdownTimer = seconds;
             LastStun = _gameTiming.CurTime;
 
-            if (Owner.TryGetComponent(out MovementSpeedModifierComponent movement))
+            if (Owner.TryGetComponent(out MovementSpeedModifierComponent? movement))
                 movement.RefreshMovementSpeedModifiers();
 
             SetAlert();
@@ -191,7 +192,7 @@ namespace Content.Shared.GameObjects.Components.Mobs
 
         private void SetAlert()
         {
-            if (!Owner.TryGetComponent(out SharedAlertsComponent status))
+            if (!Owner.TryGetComponent(out SharedAlertsComponent? status))
             {
                 return;
             }

Content.Shared/GameObjects/Components/Mobs/Speech/SharedEmotingComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Mobs/Speech/SharedSpeechComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Mobs/State/BaseMobState.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 
 namespace Content.Shared.GameObjects.Components.Mobs.State

Content.Shared/GameObjects/Components/Mobs/State/IMobState.cs

@@ -1,4 +1,5 @@
-using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
+#nullable enable
+using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Mobs/State/SharedCriticalMobState.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Alert;
+#nullable enable
+using Content.Shared.Alert;
 using Content.Shared.GameObjects.EntitySystems;
 using Robust.Shared.GameObjects;
 
@@ -15,7 +16,7 @@ namespace Content.Shared.GameObjects.Components.Mobs.State
         {
             base.EnterState(entity);
 
-            if (entity.TryGetComponent(out SharedAlertsComponent status))
+            if (entity.TryGetComponent(out SharedAlertsComponent? status))
             {
                 status.ShowAlert(AlertType.HumanCrit); // TODO: combine humancrit-0 and humancrit-1 into a gif and display it
             }

Content.Shared/GameObjects/Components/Mobs/State/SharedDeadMobState.cs

@@ -1,4 +1,5 @@
-namespace Content.Shared.GameObjects.Components.Mobs.State
+#nullable enable
+namespace Content.Shared.GameObjects.Components.Mobs.State
 {
     public abstract class SharedDeadMobState : BaseMobState
     {

Content.Shared/GameObjects/Components/Mobs/State/SharedNormalMobState.cs

@@ -1,4 +1,6 @@
-namespace Content.Shared.GameObjects.Components.Mobs.State
+#nullable enable
+
+namespace Content.Shared.GameObjects.Components.Mobs.State
 {
     /// <summary>
     ///     The standard state an entity is in; no negative effects.

Content.Shared/GameObjects/Components/Mobs/TargetingZone.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using System;
 using Robust.Shared.Serialization;
 

Content.Shared/GameObjects/Components/Movement/IMoverComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.GameObjects;
+#nullable enable
+using Robust.Shared.GameObjects;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 

Content.Shared/GameObjects/Components/Movement/IRelayMoveInput.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.Players;
 
 namespace Content.Shared.GameObjects.Components.Movement

Content.Shared/GameObjects/Components/Movement/MovementSpeedModifierComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.Containers;
+#nullable enable
+using Robust.Shared.Containers;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;
 using Robust.Shared.ViewVariables;
@@ -58,7 +59,7 @@ namespace Content.Shared.GameObjects.Components.Movement
         public static void RefreshItemModifiers(IEntity item)
         {
             if (item.TryGetContainer(out var container) &&
-                container.Owner.TryGetComponent(out MovementSpeedModifierComponent mod))
+                container.Owner.TryGetComponent(out MovementSpeedModifierComponent? mod))
             {
                 mod.RefreshMovementSpeedModifiers();
             }

Content.Shared/GameObjects/Components/Movement/SharedClimbableComponent.cs

@@ -1,4 +1,5 @@
-using Content.Shared.GameObjects.EntitySystems;
+#nullable enable
+using Content.Shared.GameObjects.EntitySystems;
 using Content.Shared.Interfaces.GameObjects.Components;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;

Content.Shared/GameObjects/Components/Movement/SharedClimbingComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Content.Shared.GameObjects.EntitySystems.ActionBlocker;
 using Content.Shared.Physics;
 using Robust.Shared.GameObjects;
@@ -12,14 +13,14 @@ namespace Content.Shared.GameObjects.Components.Movement
         public sealed override string Name => "Climbing";
         public sealed override uint? NetID => ContentNetIDs.CLIMBING;
 
-        protected IPhysicsComponent Body;
-        protected bool IsOnClimbableThisFrame = false;
+        protected IPhysicsComponent? Body;
+        protected bool IsOnClimbableThisFrame;
 
         protected bool OwnerIsTransitioning
         {
             get
             {
-                if (Body.TryGetController<ClimbController>(out var controller))
+                if (Body != null && Body.TryGetController<ClimbController>(out var controller))
                 {
                     return controller.IsActive;
                 }

Content.Shared/GameObjects/Components/Movement/SharedDummyInputMoverComponent.cs

@@ -1,3 +1,4 @@
+#nullable enable
 using Robust.Shared.GameObjects;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;

Content.Shared/GameObjects/Components/Movement/SharedSlipperyComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using Content.Shared.GameObjects.Components.Mobs;
@@ -57,9 +58,9 @@ namespace Content.Shared.GameObjects.Components.Movement
             if (!Slippery
                 || Owner.IsInContainer()
                 ||  _slipped.Contains(entity.Uid)
-                ||  !entity.TryGetComponent(out SharedStunnableComponent stun)
-                ||  !entity.TryGetComponent(out IPhysicsComponent otherBody)
-                ||  !Owner.TryGetComponent(out IPhysicsComponent body))
+                ||  !entity.TryGetComponent(out SharedStunnableComponent? stun)
+                ||  !entity.TryGetComponent(out IPhysicsComponent? otherBody)
+                ||  !Owner.TryGetComponent(out IPhysicsComponent? body))
             {
                 return false;
             }
@@ -81,7 +82,7 @@ namespace Content.Shared.GameObjects.Components.Movement
                 return false;
             }
 
-            if (entity.TryGetComponent(out IPhysicsComponent physics))
+            if (entity.TryGetComponent(out IPhysicsComponent? physics))
             {
                 var controller = physics.EnsureController<SlipController>();
                 controller.LinearVelocity = physics.LinearVelocity * LaunchForwardsMultiplier;

Content.Shared/GameObjects/Components/Nutrition/SharedCreamPiedComponent.cs

@@ -1,4 +1,5 @@
-using System;
+#nullable enable
+using System;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Serialization;