enable nullable annotations by default (#837)

This adds `#nullable disable` to all existing code (except where null is impossible like enum files), so it can be migrated incrementally.

173 files changed, 346 insertions, 2 deletions

diff --git a/src/SMAPI/Framework/Command.cs b/src/SMAPI/Framework/Command.cs
index 8c9df47d..776ba238 100644
--- a/src/SMAPI/Framework/Command.cs
+++ b/src/SMAPI/Framework/Command.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework
diff --git a/src/SMAPI/Framework/CommandManager.cs b/src/SMAPI/Framework/CommandManager.cs
index 0c0f6685..df798b0c 100644
--- a/src/SMAPI/Framework/CommandManager.cs
+++ b/src/SMAPI/Framework/CommandManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs b/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
index 643267ce..fcfa928e 100644
--- a/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
+++ b/src/SMAPI/Framework/Commands/HarmonySummaryCommand.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Commands/HelpCommand.cs b/src/SMAPI/Framework/Commands/HelpCommand.cs
index baf3116e..eb6c74f5 100644
--- a/src/SMAPI/Framework/Commands/HelpCommand.cs
+++ b/src/SMAPI/Framework/Commands/HelpCommand.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Linq;
 
 namespace StardewModdingAPI.Framework.Commands
diff --git a/src/SMAPI/Framework/Commands/IInternalCommand.cs b/src/SMAPI/Framework/Commands/IInternalCommand.cs
index abf105b6..32e3e9f1 100644
--- a/src/SMAPI/Framework/Commands/IInternalCommand.cs
+++ b/src/SMAPI/Framework/Commands/IInternalCommand.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Commands
 {
     /// <summary>A core SMAPI console command.</summary>
diff --git a/src/SMAPI/Framework/Commands/ReloadI18nCommand.cs b/src/SMAPI/Framework/Commands/ReloadI18nCommand.cs
index 12328bb6..2043b35e 100644
--- a/src/SMAPI/Framework/Commands/ReloadI18nCommand.cs
+++ b/src/SMAPI/Framework/Commands/ReloadI18nCommand.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.Commands
diff --git a/src/SMAPI/Framework/Content/AssetData.cs b/src/SMAPI/Framework/Content/AssetData.cs
index 05be8a3b..be4a7ce6 100644
--- a/src/SMAPI/Framework/Content/AssetData.cs
+++ b/src/SMAPI/Framework/Content/AssetData.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.Content
diff --git a/src/SMAPI/Framework/Content/AssetDataForDictionary.cs b/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
index 735b651c..06dbe259 100644
--- a/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForDictionary.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/Content/AssetDataForImage.cs b/src/SMAPI/Framework/Content/AssetDataForImage.cs
index b0f1b5c7..8e59cd27 100644
--- a/src/SMAPI/Framework/Content/AssetDataForImage.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForImage.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/Content/AssetDataForMap.cs b/src/SMAPI/Framework/Content/AssetDataForMap.cs
index 5986e797..0425e195 100644
--- a/src/SMAPI/Framework/Content/AssetDataForMap.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForMap.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Content/AssetDataForObject.cs b/src/SMAPI/Framework/Content/AssetDataForObject.cs
index bafd8941..4a6df64b 100644
--- a/src/SMAPI/Framework/Content/AssetDataForObject.cs
+++ b/src/SMAPI/Framework/Content/AssetDataForObject.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/Content/AssetEditOperation.cs b/src/SMAPI/Framework/Content/AssetEditOperation.cs
index 818209fa..1b7d0c93 100644
--- a/src/SMAPI/Framework/Content/AssetEditOperation.cs
+++ b/src/SMAPI/Framework/Content/AssetEditOperation.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Content/AssetInfo.cs b/src/SMAPI/Framework/Content/AssetInfo.cs
index f5da5d69..51dcc61f 100644
--- a/src/SMAPI/Framework/Content/AssetInfo.cs
+++ b/src/SMAPI/Framework/Content/AssetInfo.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/Content/AssetInterceptorChange.cs b/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
index 03d6da5a..7f53db9b 100644
--- a/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
+++ b/src/SMAPI/Framework/Content/AssetInterceptorChange.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 using StardewModdingAPI.Internal;
diff --git a/src/SMAPI/Framework/Content/AssetLoadOperation.cs b/src/SMAPI/Framework/Content/AssetLoadOperation.cs
index b12958d6..73e60e24 100644
--- a/src/SMAPI/Framework/Content/AssetLoadOperation.cs
+++ b/src/SMAPI/Framework/Content/AssetLoadOperation.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Content/AssetName.cs b/src/SMAPI/Framework/Content/AssetName.cs
index 4973b444..4d583d82 100644
--- a/src/SMAPI/Framework/Content/AssetName.cs
+++ b/src/SMAPI/Framework/Content/AssetName.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Toolkit.Utilities;
 using StardewValley;
diff --git a/src/SMAPI/Framework/Content/AssetOperationGroup.cs b/src/SMAPI/Framework/Content/AssetOperationGroup.cs
index a2fcb722..e3c3f92c 100644
--- a/src/SMAPI/Framework/Content/AssetOperationGroup.cs
+++ b/src/SMAPI/Framework/Content/AssetOperationGroup.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Content
 {
     /// <summary>A set of operations to apply to an asset for a given <see cref="IAssetEditor"/> or <see cref="IAssetLoader"/> implementation.</summary>
diff --git a/src/SMAPI/Framework/Content/ContentCache.cs b/src/SMAPI/Framework/Content/ContentCache.cs
index 8e0c6228..4e620d28 100644
--- a/src/SMAPI/Framework/Content/ContentCache.cs
+++ b/src/SMAPI/Framework/Content/ContentCache.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.Contracts;
diff --git a/src/SMAPI/Framework/Content/TilesheetReference.cs b/src/SMAPI/Framework/Content/TilesheetReference.cs
index 0339b802..cdc4bc62 100644
--- a/src/SMAPI/Framework/Content/TilesheetReference.cs
+++ b/src/SMAPI/Framework/Content/TilesheetReference.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using xTile.Dimensions;
 
 namespace StardewModdingAPI.Framework.Content
diff --git a/src/SMAPI/Framework/ContentCoordinator.cs b/src/SMAPI/Framework/ContentCoordinator.cs
index 88ed96da..bfde649a 100644
--- a/src/SMAPI/Framework/ContentCoordinator.cs
+++ b/src/SMAPI/Framework/ContentCoordinator.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/ContentManagers/BaseContentManager.cs b/src/SMAPI/Framework/ContentManagers/BaseContentManager.cs
index c803905a..4594d235 100644
--- a/src/SMAPI/Framework/ContentManagers/BaseContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/BaseContentManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/ContentManagers/GameContentManager.cs b/src/SMAPI/Framework/ContentManagers/GameContentManager.cs
index cad5f6db..f4e1bda4 100644
--- a/src/SMAPI/Framework/ContentManagers/GameContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/GameContentManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Globalization;
diff --git a/src/SMAPI/Framework/ContentManagers/GameContentManagerForAssetPropagation.cs b/src/SMAPI/Framework/ContentManagers/GameContentManagerForAssetPropagation.cs
index 3f7188da..46d5d24e 100644
--- a/src/SMAPI/Framework/ContentManagers/GameContentManagerForAssetPropagation.cs
+++ b/src/SMAPI/Framework/ContentManagers/GameContentManagerForAssetPropagation.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Globalization;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/ContentManagers/IContentManager.cs b/src/SMAPI/Framework/ContentManagers/IContentManager.cs
index 90095492..c4625761 100644
--- a/src/SMAPI/Framework/ContentManagers/IContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/IContentManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Content;
diff --git a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
index e0c85265..8051c296 100644
--- a/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
+++ b/src/SMAPI/Framework/ContentManagers/ModContentManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Globalization;
 using System.IO;
diff --git a/src/SMAPI/Framework/ContentPack.cs b/src/SMAPI/Framework/ContentPack.cs
index e02ef88b..2d33a22e 100644
--- a/src/SMAPI/Framework/ContentPack.cs
+++ b/src/SMAPI/Framework/ContentPack.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.IO;
 using StardewModdingAPI.Framework.ModHelpers;
diff --git a/src/SMAPI/Framework/CursorPosition.cs b/src/SMAPI/Framework/CursorPosition.cs
index 107481e7..8f36a554 100644
--- a/src/SMAPI/Framework/CursorPosition.cs
+++ b/src/SMAPI/Framework/CursorPosition.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Microsoft.Xna.Framework;
 using StardewValley;
 
diff --git a/src/SMAPI/Framework/DeprecationManager.cs b/src/SMAPI/Framework/DeprecationManager.cs
index ad6a3677..fe1b623f 100644
--- a/src/SMAPI/Framework/DeprecationManager.cs
+++ b/src/SMAPI/Framework/DeprecationManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/DeprecationWarning.cs b/src/SMAPI/Framework/DeprecationWarning.cs
index 5201b06c..f155358b 100644
--- a/src/SMAPI/Framework/DeprecationWarning.cs
+++ b/src/SMAPI/Framework/DeprecationWarning.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework
 {
     /// <summary>A deprecation warning for a mod.</summary>
diff --git a/src/SMAPI/Framework/Events/EventManager.cs b/src/SMAPI/Framework/Events/EventManager.cs
index 41540047..c977e73d 100644
--- a/src/SMAPI/Framework/Events/EventManager.cs
+++ b/src/SMAPI/Framework/Events/EventManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using StardewModdingAPI.Events;
 
 namespace StardewModdingAPI.Framework.Events
diff --git a/src/SMAPI/Framework/Events/IManagedEvent.cs b/src/SMAPI/Framework/Events/IManagedEvent.cs
index e4e3ca08..57277576 100644
--- a/src/SMAPI/Framework/Events/IManagedEvent.cs
+++ b/src/SMAPI/Framework/Events/IManagedEvent.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Events
 {
     /// <summary>Metadata for an event raised by SMAPI.</summary>
diff --git a/src/SMAPI/Framework/Events/ManagedEvent.cs b/src/SMAPI/Framework/Events/ManagedEvent.cs
index 1c8b9d04..8fa31165 100644
--- a/src/SMAPI/Framework/Events/ManagedEvent.cs
+++ b/src/SMAPI/Framework/Events/ManagedEvent.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Events/ManagedEventHandler.cs b/src/SMAPI/Framework/Events/ManagedEventHandler.cs
index 97040f76..f31bc04d 100644
--- a/src/SMAPI/Framework/Events/ManagedEventHandler.cs
+++ b/src/SMAPI/Framework/Events/ManagedEventHandler.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModContentEvents.cs b/src/SMAPI/Framework/Events/ModContentEvents.cs
index beb96031..f198b793 100644
--- a/src/SMAPI/Framework/Events/ModContentEvents.cs
+++ b/src/SMAPI/Framework/Events/ModContentEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModDisplayEvents.cs b/src/SMAPI/Framework/Events/ModDisplayEvents.cs
index 48f55324..b2110cce 100644
--- a/src/SMAPI/Framework/Events/ModDisplayEvents.cs
+++ b/src/SMAPI/Framework/Events/ModDisplayEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModEvents.cs b/src/SMAPI/Framework/Events/ModEvents.cs
index 1fb3482c..e8f8885d 100644
--- a/src/SMAPI/Framework/Events/ModEvents.cs
+++ b/src/SMAPI/Framework/Events/ModEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using StardewModdingAPI.Events;
 
 namespace StardewModdingAPI.Framework.Events
diff --git a/src/SMAPI/Framework/Events/ModEventsBase.cs b/src/SMAPI/Framework/Events/ModEventsBase.cs
index 77708fc1..295caa0d 100644
--- a/src/SMAPI/Framework/Events/ModEventsBase.cs
+++ b/src/SMAPI/Framework/Events/ModEventsBase.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Events
 {
     /// <summary>An internal base class for event API classes.</summary>
diff --git a/src/SMAPI/Framework/Events/ModGameLoopEvents.cs b/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
index 5f0db369..51803daf 100644
--- a/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
+++ b/src/SMAPI/Framework/Events/ModGameLoopEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModInputEvents.cs b/src/SMAPI/Framework/Events/ModInputEvents.cs
index 40edf806..6af79c59 100644
--- a/src/SMAPI/Framework/Events/ModInputEvents.cs
+++ b/src/SMAPI/Framework/Events/ModInputEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModMultiplayerEvents.cs b/src/SMAPI/Framework/Events/ModMultiplayerEvents.cs
index b90f64fa..7d3ce510 100644
--- a/src/SMAPI/Framework/Events/ModMultiplayerEvents.cs
+++ b/src/SMAPI/Framework/Events/ModMultiplayerEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModPlayerEvents.cs b/src/SMAPI/Framework/Events/ModPlayerEvents.cs
index b2d89e9a..dac8f05b 100644
--- a/src/SMAPI/Framework/Events/ModPlayerEvents.cs
+++ b/src/SMAPI/Framework/Events/ModPlayerEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModSpecialisedEvents.cs b/src/SMAPI/Framework/Events/ModSpecialisedEvents.cs
index 7980208b..4b438034 100644
--- a/src/SMAPI/Framework/Events/ModSpecialisedEvents.cs
+++ b/src/SMAPI/Framework/Events/ModSpecialisedEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Events/ModWorldEvents.cs b/src/SMAPI/Framework/Events/ModWorldEvents.cs
index a7b7d799..614945c7 100644
--- a/src/SMAPI/Framework/Events/ModWorldEvents.cs
+++ b/src/SMAPI/Framework/Events/ModWorldEvents.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Events;
 
diff --git a/src/SMAPI/Framework/Exceptions/SAssemblyLoadFailedException.cs b/src/SMAPI/Framework/Exceptions/SAssemblyLoadFailedException.cs
index ec9279f1..4e03a687 100644
--- a/src/SMAPI/Framework/Exceptions/SAssemblyLoadFailedException.cs
+++ b/src/SMAPI/Framework/Exceptions/SAssemblyLoadFailedException.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.Exceptions
diff --git a/src/SMAPI/Framework/Exceptions/SContentLoadException.cs b/src/SMAPI/Framework/Exceptions/SContentLoadException.cs
index 85d85e3d..c21a6b0e 100644
--- a/src/SMAPI/Framework/Exceptions/SContentLoadException.cs
+++ b/src/SMAPI/Framework/Exceptions/SContentLoadException.cs
@@ -1,4 +1,6 @@
-using System;
+#nullable disable
+
+using System;
 using Microsoft.Xna.Framework.Content;
 
 namespace StardewModdingAPI.Framework.Exceptions
diff --git a/src/SMAPI/Framework/GameVersion.cs b/src/SMAPI/Framework/GameVersion.cs
index b69c6757..aa91d8f3 100644
--- a/src/SMAPI/Framework/GameVersion.cs
+++ b/src/SMAPI/Framework/GameVersion.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/IModMetadata.cs b/src/SMAPI/Framework/IModMetadata.cs
index cb876ee4..800b198a 100644
--- a/src/SMAPI/Framework/IModMetadata.cs
+++ b/src/SMAPI/Framework/IModMetadata.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using StardewModdingAPI.Framework.ModHelpers;
diff --git a/src/SMAPI/Framework/Input/GamePadStateBuilder.cs b/src/SMAPI/Framework/Input/GamePadStateBuilder.cs
index ad254828..21168b7a 100644
--- a/src/SMAPI/Framework/Input/GamePadStateBuilder.cs
+++ b/src/SMAPI/Framework/Input/GamePadStateBuilder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Xna.Framework;
diff --git a/src/SMAPI/Framework/Input/IInputStateBuilder.cs b/src/SMAPI/Framework/Input/IInputStateBuilder.cs
index 28d62439..3fb62686 100644
--- a/src/SMAPI/Framework/Input/IInputStateBuilder.cs
+++ b/src/SMAPI/Framework/Input/IInputStateBuilder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 
 namespace StardewModdingAPI.Framework.Input
diff --git a/src/SMAPI/Framework/Input/KeyboardStateBuilder.cs b/src/SMAPI/Framework/Input/KeyboardStateBuilder.cs
index 09bc48b6..81ca0ebb 100644
--- a/src/SMAPI/Framework/Input/KeyboardStateBuilder.cs
+++ b/src/SMAPI/Framework/Input/KeyboardStateBuilder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Xna.Framework.Input;
diff --git a/src/SMAPI/Framework/Input/MouseStateBuilder.cs b/src/SMAPI/Framework/Input/MouseStateBuilder.cs
index c2a0891b..85b38d32 100644
--- a/src/SMAPI/Framework/Input/MouseStateBuilder.cs
+++ b/src/SMAPI/Framework/Input/MouseStateBuilder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Microsoft.Xna.Framework.Input;
 
diff --git a/src/SMAPI/Framework/Input/SInputState.cs b/src/SMAPI/Framework/Input/SInputState.cs
index 72adca02..37b3c8ef 100644
--- a/src/SMAPI/Framework/Input/SInputState.cs
+++ b/src/SMAPI/Framework/Input/SInputState.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/InternalExtensions.cs b/src/SMAPI/Framework/InternalExtensions.cs
index 54aeffd7..a1d87487 100644
--- a/src/SMAPI/Framework/InternalExtensions.cs
+++ b/src/SMAPI/Framework/InternalExtensions.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Logging/InterceptingTextWriter.cs b/src/SMAPI/Framework/Logging/InterceptingTextWriter.cs
index bad69a2a..a0957b90 100644
--- a/src/SMAPI/Framework/Logging/InterceptingTextWriter.cs
+++ b/src/SMAPI/Framework/Logging/InterceptingTextWriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.IO;
 using System.Text;
diff --git a/src/SMAPI/Framework/Logging/LogFileManager.cs b/src/SMAPI/Framework/Logging/LogFileManager.cs
index 6ab2bdfb..0b6f9ad2 100644
--- a/src/SMAPI/Framework/Logging/LogFileManager.cs
+++ b/src/SMAPI/Framework/Logging/LogFileManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.IO;
 
diff --git a/src/SMAPI/Framework/Logging/LogManager.cs b/src/SMAPI/Framework/Logging/LogManager.cs
index a8a8b6ee..dab7f554 100644
--- a/src/SMAPI/Framework/Logging/LogManager.cs
+++ b/src/SMAPI/Framework/Logging/LogManager.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/ModHelpers/BaseHelper.cs b/src/SMAPI/Framework/ModHelpers/BaseHelper.cs
index 5a3d4bed..1cd1a6b3 100644
--- a/src/SMAPI/Framework/ModHelpers/BaseHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/BaseHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.ModHelpers
 {
     /// <summary>The common base class for mod helpers.</summary>
diff --git a/src/SMAPI/Framework/ModHelpers/CommandHelper.cs b/src/SMAPI/Framework/ModHelpers/CommandHelper.cs
index 69382009..c2b5092e 100644
--- a/src/SMAPI/Framework/ModHelpers/CommandHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/CommandHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.ModHelpers
diff --git a/src/SMAPI/Framework/ModHelpers/ContentHelper.cs b/src/SMAPI/Framework/ModHelpers/ContentHelper.cs
index 14aa74c2..e72e397e 100644
--- a/src/SMAPI/Framework/ModHelpers/ContentHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ContentHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
diff --git a/src/SMAPI/Framework/ModHelpers/ContentPackHelper.cs b/src/SMAPI/Framework/ModHelpers/ContentPackHelper.cs
index d39abc7d..336214e2 100644
--- a/src/SMAPI/Framework/ModHelpers/ContentPackHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ContentPackHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModHelpers/DataHelper.cs b/src/SMAPI/Framework/ModHelpers/DataHelper.cs
index 4cbfd73f..86a34ee8 100644
--- a/src/SMAPI/Framework/ModHelpers/DataHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/DataHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModHelpers/GameContentHelper.cs b/src/SMAPI/Framework/ModHelpers/GameContentHelper.cs
index 0eb385d4..ed0c46d5 100644
--- a/src/SMAPI/Framework/ModHelpers/GameContentHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/GameContentHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Linq;
 using StardewModdingAPI.Framework.Content;
diff --git a/src/SMAPI/Framework/ModHelpers/InputHelper.cs b/src/SMAPI/Framework/ModHelpers/InputHelper.cs
index 88caf4c3..29f80d87 100644
--- a/src/SMAPI/Framework/ModHelpers/InputHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/InputHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewModdingAPI.Framework.Input;
 using StardewModdingAPI.Utilities;
diff --git a/src/SMAPI/Framework/ModHelpers/ModContentHelper.cs b/src/SMAPI/Framework/ModHelpers/ModContentHelper.cs
index 7468cda1..90064354 100644
--- a/src/SMAPI/Framework/ModHelpers/ModContentHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ModContentHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework.Content;
 using StardewModdingAPI.Framework.Content;
diff --git a/src/SMAPI/Framework/ModHelpers/ModHelper.cs b/src/SMAPI/Framework/ModHelpers/ModHelper.cs
index 5b567ee0..2a8aeb3a 100644
--- a/src/SMAPI/Framework/ModHelpers/ModHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ModHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.IO;
 using StardewModdingAPI.Events;
diff --git a/src/SMAPI/Framework/ModHelpers/ModRegistryHelper.cs b/src/SMAPI/Framework/ModHelpers/ModRegistryHelper.cs
index 09a392a6..e277e6fa 100644
--- a/src/SMAPI/Framework/ModHelpers/ModRegistryHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ModRegistryHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using StardewModdingAPI.Framework.Reflection;
 
diff --git a/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs b/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
index a7ce8692..96b074e2 100644
--- a/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/MultiplayerHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using StardewModdingAPI.Framework.Networking;
 using StardewValley;
diff --git a/src/SMAPI/Framework/ModHelpers/ReflectionHelper.cs b/src/SMAPI/Framework/ModHelpers/ReflectionHelper.cs
index 5a4ea742..24cbd01c 100644
--- a/src/SMAPI/Framework/ModHelpers/ReflectionHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/ReflectionHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 using StardewModdingAPI.Framework.Reflection;
diff --git a/src/SMAPI/Framework/ModHelpers/TranslationHelper.cs b/src/SMAPI/Framework/ModHelpers/TranslationHelper.cs
index 869664fe..37345a76 100644
--- a/src/SMAPI/Framework/ModHelpers/TranslationHelper.cs
+++ b/src/SMAPI/Framework/ModHelpers/TranslationHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using StardewValley;
 
diff --git a/src/SMAPI/Framework/ModLinked.cs b/src/SMAPI/Framework/ModLinked.cs
index 8cfe6f5f..5a3e38ca 100644
--- a/src/SMAPI/Framework/ModLinked.cs
+++ b/src/SMAPI/Framework/ModLinked.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework
 {
     /// <summary>A generic tuple which links something to a mod.</summary>
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyDefinitionResolver.cs b/src/SMAPI/Framework/ModLoading/AssemblyDefinitionResolver.cs
index 8e2f5ef3..1d4ddf72 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyDefinitionResolver.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyDefinitionResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Mono.Cecil;
 
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyLoadStatus.cs b/src/SMAPI/Framework/ModLoading/AssemblyLoadStatus.cs
index 11be19fc..d2d5d83b 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyLoadStatus.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyLoadStatus.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.ModLoading
 {
     /// <summary>Indicates the result of an assembly load.</summary>
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
index 24214c96..070ee803 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyLoader.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModLoading/AssemblyParseResult.cs b/src/SMAPI/Framework/ModLoading/AssemblyParseResult.cs
index b56a776c..56bd5a8b 100644
--- a/src/SMAPI/Framework/ModLoading/AssemblyParseResult.cs
+++ b/src/SMAPI/Framework/ModLoading/AssemblyParseResult.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.IO;
 using Mono.Cecil;
 
diff --git a/src/SMAPI/Framework/ModLoading/Finders/EventFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/EventFinder.cs
index 124951a5..7c94beb7 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/EventFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/EventFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/FieldFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/FieldFinder.cs
index 68415123..96b4098a 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/FieldFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/FieldFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/MethodFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/MethodFinder.cs
index d2340f01..7d3c1fd7 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/MethodFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/MethodFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Mono.Cecil;
 using Mono.Cecil.Cil;
 using StardewModdingAPI.Framework.ModLoading.Framework;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/PropertyFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/PropertyFinder.cs
index 99344848..b2f2e193 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/PropertyFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/PropertyFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Mono.Cecil;
 using Mono.Cecil.Cil;
 using StardewModdingAPI.Framework.ModLoading.Framework;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMemberWithUnexpectedTypeFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMemberWithUnexpectedTypeFinder.cs
index 8c1cae2b..81f90498 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMemberWithUnexpectedTypeFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMemberWithUnexpectedTypeFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMissingMemberFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMissingMemberFinder.cs
index d305daf4..001d1986 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMissingMemberFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/ReferenceToMissingMemberFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/TypeAssemblyFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/TypeAssemblyFinder.cs
index 24ab2eca..4c589ed8 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/TypeAssemblyFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/TypeAssemblyFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Mono.Cecil;
 using StardewModdingAPI.Framework.ModLoading.Framework;
diff --git a/src/SMAPI/Framework/ModLoading/Finders/TypeFinder.cs b/src/SMAPI/Framework/ModLoading/Finders/TypeFinder.cs
index 260a8df8..04a5b970 100644
--- a/src/SMAPI/Framework/ModLoading/Finders/TypeFinder.cs
+++ b/src/SMAPI/Framework/ModLoading/Finders/TypeFinder.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Framework/BaseInstructionHandler.cs b/src/SMAPI/Framework/ModLoading/Framework/BaseInstructionHandler.cs
index d5d1b38e..bea786cd 100644
--- a/src/SMAPI/Framework/ModLoading/Framework/BaseInstructionHandler.cs
+++ b/src/SMAPI/Framework/ModLoading/Framework/BaseInstructionHandler.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs b/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
index 4f14a579..09ff78f7 100644
--- a/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Framework/RecursiveRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/ModLoading/Framework/RewriteHelper.cs b/src/SMAPI/Framework/ModLoading/Framework/RewriteHelper.cs
index d7cb2471..8f47fbdd 100644
--- a/src/SMAPI/Framework/ModLoading/Framework/RewriteHelper.cs
+++ b/src/SMAPI/Framework/ModLoading/Framework/RewriteHelper.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Linq;
 using System.Reflection;
diff --git a/src/SMAPI/Framework/ModLoading/IInstructionHandler.cs b/src/SMAPI/Framework/ModLoading/IInstructionHandler.cs
index d41732f8..126504e3 100644
--- a/src/SMAPI/Framework/ModLoading/IInstructionHandler.cs
+++ b/src/SMAPI/Framework/ModLoading/IInstructionHandler.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/IncompatibleInstructionException.cs b/src/SMAPI/Framework/ModLoading/IncompatibleInstructionException.cs
index 1f9add30..29406f2a 100644
--- a/src/SMAPI/Framework/ModLoading/IncompatibleInstructionException.cs
+++ b/src/SMAPI/Framework/ModLoading/IncompatibleInstructionException.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.ModLoading
diff --git a/src/SMAPI/Framework/ModLoading/InvalidModStateException.cs b/src/SMAPI/Framework/ModLoading/InvalidModStateException.cs
index 075e237a..9dca9bc4 100644
--- a/src/SMAPI/Framework/ModLoading/InvalidModStateException.cs
+++ b/src/SMAPI/Framework/ModLoading/InvalidModStateException.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.ModLoading
diff --git a/src/SMAPI/Framework/ModLoading/ModMetadata.cs b/src/SMAPI/Framework/ModLoading/ModMetadata.cs
index 9e6bc61f..0e698bfd 100644
--- a/src/SMAPI/Framework/ModLoading/ModMetadata.cs
+++ b/src/SMAPI/Framework/ModLoading/ModMetadata.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModLoading/ModResolver.cs b/src/SMAPI/Framework/ModLoading/ModResolver.cs
index d52cdbb4..51463048 100644
--- a/src/SMAPI/Framework/ModLoading/ModResolver.cs
+++ b/src/SMAPI/Framework/ModLoading/ModResolver.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModLoading/PlatformAssemblyMap.cs b/src/SMAPI/Framework/ModLoading/PlatformAssemblyMap.cs
index d4366294..0898f095 100644
--- a/src/SMAPI/Framework/ModLoading/PlatformAssemblyMap.cs
+++ b/src/SMAPI/Framework/ModLoading/PlatformAssemblyMap.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/ModLoading/RewriteFacades/AccessToolsFacade.cs b/src/SMAPI/Framework/ModLoading/RewriteFacades/AccessToolsFacade.cs
index be2a1c58..c05005b8 100644
--- a/src/SMAPI/Framework/ModLoading/RewriteFacades/AccessToolsFacade.cs
+++ b/src/SMAPI/Framework/ModLoading/RewriteFacades/AccessToolsFacade.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceFacade.cs b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceFacade.cs
index 135bd218..fea8c100 100644
--- a/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceFacade.cs
+++ b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyInstanceFacade.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyMethodFacade.cs b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyMethodFacade.cs
index 5162dda4..93124591 100644
--- a/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyMethodFacade.cs
+++ b/src/SMAPI/Framework/ModLoading/RewriteFacades/HarmonyMethodFacade.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
diff --git a/src/SMAPI/Framework/ModLoading/RewriteFacades/SpriteBatchFacade.cs b/src/SMAPI/Framework/ModLoading/RewriteFacades/SpriteBatchFacade.cs
index 5f68f8d9..20a30f8f 100644
--- a/src/SMAPI/Framework/ModLoading/RewriteFacades/SpriteBatchFacade.cs
+++ b/src/SMAPI/Framework/ModLoading/RewriteFacades/SpriteBatchFacade.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/ArchitectureAssemblyRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/ArchitectureAssemblyRewriter.cs
index cc830216..4985d72a 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/ArchitectureAssemblyRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/ArchitectureAssemblyRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Mono.Cecil;
 using StardewModdingAPI.Framework.ModLoading.Framework;
 
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/FieldReplaceRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/FieldReplaceRewriter.cs
index 857a2230..806fca62 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/FieldReplaceRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/FieldReplaceRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Reflection;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/HarmonyRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/HarmonyRewriter.cs
index f715fb6b..92397c58 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/HarmonyRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/HarmonyRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using HarmonyLib;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicFieldRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicFieldRewriter.cs
index 2eee8ff9..fc06e779 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicFieldRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicFieldRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicMethodRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicMethodRewriter.cs
index 89de437e..4860072c 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicMethodRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/HeuristicMethodRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/MethodParentRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/MethodParentRewriter.cs
index 9933e2ca..00daf337 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/MethodParentRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/MethodParentRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Linq;
 using Mono.Cecil;
diff --git a/src/SMAPI/Framework/ModLoading/Rewriters/TypeReferenceRewriter.cs b/src/SMAPI/Framework/ModLoading/Rewriters/TypeReferenceRewriter.cs
index ad5cb96f..bdc4c4f3 100644
--- a/src/SMAPI/Framework/ModLoading/Rewriters/TypeReferenceRewriter.cs
+++ b/src/SMAPI/Framework/ModLoading/Rewriters/TypeReferenceRewriter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Mono.Cecil;
 using StardewModdingAPI.Framework.ModLoading.Framework;
diff --git a/src/SMAPI/Framework/ModLoading/Symbols/SymbolReader.cs b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReader.cs
index 2171895d..55b7e0c8 100644
--- a/src/SMAPI/Framework/ModLoading/Symbols/SymbolReader.cs
+++ b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReader.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.IO;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
diff --git a/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs
index d28c4a22..4af7c1e7 100644
--- a/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs
+++ b/src/SMAPI/Framework/ModLoading/Symbols/SymbolReaderProvider.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/ModLoading/Symbols/SymbolWriterProvider.cs b/src/SMAPI/Framework/ModLoading/Symbols/SymbolWriterProvider.cs
index 8f7e05d1..c2ac4cd6 100644
--- a/src/SMAPI/Framework/ModLoading/Symbols/SymbolWriterProvider.cs
+++ b/src/SMAPI/Framework/ModLoading/Symbols/SymbolWriterProvider.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.IO;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
diff --git a/src/SMAPI/Framework/ModLoading/TypeReferenceComparer.cs b/src/SMAPI/Framework/ModLoading/TypeReferenceComparer.cs
index a4ac54e2..248c29fc 100644
--- a/src/SMAPI/Framework/ModLoading/TypeReferenceComparer.cs
+++ b/src/SMAPI/Framework/ModLoading/TypeReferenceComparer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/ModRegistry.cs b/src/SMAPI/Framework/ModRegistry.cs
index c0f8d537..cae38637 100644
--- a/src/SMAPI/Framework/ModRegistry.cs
+++ b/src/SMAPI/Framework/ModRegistry.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
diff --git a/src/SMAPI/Framework/Models/SConfig.cs b/src/SMAPI/Framework/Models/SConfig.cs
index 1e78f316..e74d73b5 100644
--- a/src/SMAPI/Framework/Models/SConfig.cs
+++ b/src/SMAPI/Framework/Models/SConfig.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Monitor.cs b/src/SMAPI/Framework/Monitor.cs
index 6b53daff..de145d1d 100644
--- a/src/SMAPI/Framework/Monitor.cs
+++ b/src/SMAPI/Framework/Monitor.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Networking/ModMessageModel.cs b/src/SMAPI/Framework/Networking/ModMessageModel.cs
index 4f694f9c..4e7d01eb 100644
--- a/src/SMAPI/Framework/Networking/ModMessageModel.cs
+++ b/src/SMAPI/Framework/Networking/ModMessageModel.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Linq;
 using Newtonsoft.Json.Linq;
 
diff --git a/src/SMAPI/Framework/Networking/MultiplayerPeer.cs b/src/SMAPI/Framework/Networking/MultiplayerPeer.cs
index 3923700f..8ee5c309 100644
--- a/src/SMAPI/Framework/Networking/MultiplayerPeer.cs
+++ b/src/SMAPI/Framework/Networking/MultiplayerPeer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Networking/MultiplayerPeerMod.cs b/src/SMAPI/Framework/Networking/MultiplayerPeerMod.cs
index 8087dc7e..6fdb9e54 100644
--- a/src/SMAPI/Framework/Networking/MultiplayerPeerMod.cs
+++ b/src/SMAPI/Framework/Networking/MultiplayerPeerMod.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Networking
 {
     internal class MultiplayerPeerMod : IMultiplayerPeerMod
diff --git a/src/SMAPI/Framework/Networking/RemoteContextModModel.cs b/src/SMAPI/Framework/Networking/RemoteContextModModel.cs
index 9795d971..0383576c 100644
--- a/src/SMAPI/Framework/Networking/RemoteContextModModel.cs
+++ b/src/SMAPI/Framework/Networking/RemoteContextModModel.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Networking
 {
     /// <summary>Metadata about an installed mod exchanged with connected computers.</summary>
diff --git a/src/SMAPI/Framework/Networking/RemoteContextModel.cs b/src/SMAPI/Framework/Networking/RemoteContextModel.cs
index 7befb151..37fafa67 100644
--- a/src/SMAPI/Framework/Networking/RemoteContextModel.cs
+++ b/src/SMAPI/Framework/Networking/RemoteContextModel.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.Networking
 {
     /// <summary>Metadata about the game, SMAPI, and installed mods exchanged with connected computers.</summary>
diff --git a/src/SMAPI/Framework/Networking/SGalaxyNetClient.cs b/src/SMAPI/Framework/Networking/SGalaxyNetClient.cs
index 01095c66..8e19b4a7 100644
--- a/src/SMAPI/Framework/Networking/SGalaxyNetClient.cs
+++ b/src/SMAPI/Framework/Networking/SGalaxyNetClient.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Galaxy.Api;
 using StardewValley.Network;
diff --git a/src/SMAPI/Framework/Networking/SGalaxyNetServer.cs b/src/SMAPI/Framework/Networking/SGalaxyNetServer.cs
index 71e11576..07a004a2 100644
--- a/src/SMAPI/Framework/Networking/SGalaxyNetServer.cs
+++ b/src/SMAPI/Framework/Networking/SGalaxyNetServer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
diff --git a/src/SMAPI/Framework/Networking/SLidgrenClient.cs b/src/SMAPI/Framework/Networking/SLidgrenClient.cs
index 39876744..ecf18cbd 100644
--- a/src/SMAPI/Framework/Networking/SLidgrenClient.cs
+++ b/src/SMAPI/Framework/Networking/SLidgrenClient.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using StardewValley.Network;
 
diff --git a/src/SMAPI/Framework/Networking/SLidgrenServer.cs b/src/SMAPI/Framework/Networking/SLidgrenServer.cs
index ff871e64..c0b247c8 100644
--- a/src/SMAPI/Framework/Networking/SLidgrenServer.cs
+++ b/src/SMAPI/Framework/Networking/SLidgrenServer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
diff --git a/src/SMAPI/Framework/Reflection/CacheEntry.cs b/src/SMAPI/Framework/Reflection/CacheEntry.cs
index 912662e3..6b18d204 100644
--- a/src/SMAPI/Framework/Reflection/CacheEntry.cs
+++ b/src/SMAPI/Framework/Reflection/CacheEntry.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Reflection;
 
 namespace StardewModdingAPI.Framework.Reflection
diff --git a/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs b/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs
index 40adde8e..4c49e219 100644
--- a/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs
+++ b/src/SMAPI/Framework/Reflection/InterfaceProxyFactory.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Reflection;
 using System.Reflection.Emit;
 using Nanoray.Pintail;
diff --git a/src/SMAPI/Framework/Reflection/ReflectedField.cs b/src/SMAPI/Framework/Reflection/ReflectedField.cs
index 3c4da4fc..921876b9 100644
--- a/src/SMAPI/Framework/Reflection/ReflectedField.cs
+++ b/src/SMAPI/Framework/Reflection/ReflectedField.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 
diff --git a/src/SMAPI/Framework/Reflection/ReflectedMethod.cs b/src/SMAPI/Framework/Reflection/ReflectedMethod.cs
index 26112806..50f89b40 100644
--- a/src/SMAPI/Framework/Reflection/ReflectedMethod.cs
+++ b/src/SMAPI/Framework/Reflection/ReflectedMethod.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 
diff --git a/src/SMAPI/Framework/Reflection/ReflectedProperty.cs b/src/SMAPI/Framework/Reflection/ReflectedProperty.cs
index 42d7bb59..a6d8c75c 100644
--- a/src/SMAPI/Framework/Reflection/ReflectedProperty.cs
+++ b/src/SMAPI/Framework/Reflection/ReflectedProperty.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Reflection;
 
diff --git a/src/SMAPI/Framework/Reflection/Reflector.cs b/src/SMAPI/Framework/Reflection/Reflector.cs
index 3a93ab5d..d5938c3f 100644
--- a/src/SMAPI/Framework/Reflection/Reflector.cs
+++ b/src/SMAPI/Framework/Reflection/Reflector.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Linq;
 using System.Reflection;
diff --git a/src/SMAPI/Framework/Rendering/SDisplayDevice.cs b/src/SMAPI/Framework/Rendering/SDisplayDevice.cs
index 85e69ae6..8718bcb1 100644
--- a/src/SMAPI/Framework/Rendering/SDisplayDevice.cs
+++ b/src/SMAPI/Framework/Rendering/SDisplayDevice.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Content;
diff --git a/src/SMAPI/Framework/Rendering/SXnaDisplayDevice.cs b/src/SMAPI/Framework/Rendering/SXnaDisplayDevice.cs
index cb499c6b..21edaedd 100644
--- a/src/SMAPI/Framework/Rendering/SXnaDisplayDevice.cs
+++ b/src/SMAPI/Framework/Rendering/SXnaDisplayDevice.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/RequestExitDelegate.cs b/src/SMAPI/Framework/RequestExitDelegate.cs
index 810c399b..93ef1cf9 100644
--- a/src/SMAPI/Framework/RequestExitDelegate.cs
+++ b/src/SMAPI/Framework/RequestExitDelegate.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework
 {
     /// <summary>A delegate which requests that SMAPI immediately exit the game. This should only be invoked when an irrecoverable fatal error happens that risks save corruption or game-breaking bugs.</summary>
diff --git a/src/SMAPI/Framework/SChatBox.cs b/src/SMAPI/Framework/SChatBox.cs
index e000d1cd..d6286c12 100644
--- a/src/SMAPI/Framework/SChatBox.cs
+++ b/src/SMAPI/Framework/SChatBox.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using StardewValley;
 using StardewValley.Menus;
 
diff --git a/src/SMAPI/Framework/SCore.cs b/src/SMAPI/Framework/SCore.cs
index b471c383..8a5c10f6 100644
--- a/src/SMAPI/Framework/SCore.cs
+++ b/src/SMAPI/Framework/SCore.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
diff --git a/src/SMAPI/Framework/SGame.cs b/src/SMAPI/Framework/SGame.cs
index 989b59d8..7ca89eec 100644
--- a/src/SMAPI/Framework/SGame.cs
+++ b/src/SMAPI/Framework/SGame.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.ObjectModel;
 using System.Diagnostics.CodeAnalysis;
diff --git a/src/SMAPI/Framework/SGameRunner.cs b/src/SMAPI/Framework/SGameRunner.cs
index 81cac145..dae314af 100644
--- a/src/SMAPI/Framework/SGameRunner.cs
+++ b/src/SMAPI/Framework/SGameRunner.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/SModHooks.cs b/src/SMAPI/Framework/SModHooks.cs
index 101e022a..7941e102 100644
--- a/src/SMAPI/Framework/SModHooks.cs
+++ b/src/SMAPI/Framework/SModHooks.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Threading.Tasks;
 using StardewValley;
diff --git a/src/SMAPI/Framework/SMultiplayer.cs b/src/SMAPI/Framework/SMultiplayer.cs
index bcf97006..de3c25a5 100644
--- a/src/SMAPI/Framework/SMultiplayer.cs
+++ b/src/SMAPI/Framework/SMultiplayer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/SMAPI/Framework/Serialization/ColorConverter.cs b/src/SMAPI/Framework/Serialization/ColorConverter.cs
index 3b3720b5..8fb6cd9c 100644
--- a/src/SMAPI/Framework/Serialization/ColorConverter.cs
+++ b/src/SMAPI/Framework/Serialization/ColorConverter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Newtonsoft.Json.Linq;
diff --git a/src/SMAPI/Framework/Serialization/KeybindConverter.cs b/src/SMAPI/Framework/Serialization/KeybindConverter.cs
index 7c5db3ad..9cf52228 100644
--- a/src/SMAPI/Framework/Serialization/KeybindConverter.cs
+++ b/src/SMAPI/Framework/Serialization/KeybindConverter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
diff --git a/src/SMAPI/Framework/Serialization/PointConverter.cs b/src/SMAPI/Framework/Serialization/PointConverter.cs
index 21d1f845..b48d757a 100644
--- a/src/SMAPI/Framework/Serialization/PointConverter.cs
+++ b/src/SMAPI/Framework/Serialization/PointConverter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Newtonsoft.Json.Linq;
diff --git a/src/SMAPI/Framework/Serialization/RectangleConverter.cs b/src/SMAPI/Framework/Serialization/RectangleConverter.cs
index 31f3ad77..7f060e3a 100644
--- a/src/SMAPI/Framework/Serialization/RectangleConverter.cs
+++ b/src/SMAPI/Framework/Serialization/RectangleConverter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Text.RegularExpressions;
 using Microsoft.Xna.Framework;
diff --git a/src/SMAPI/Framework/Serialization/Vector2Converter.cs b/src/SMAPI/Framework/Serialization/Vector2Converter.cs
index 589febf8..bcd483d3 100644
--- a/src/SMAPI/Framework/Serialization/Vector2Converter.cs
+++ b/src/SMAPI/Framework/Serialization/Vector2Converter.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using Microsoft.Xna.Framework;
 using Newtonsoft.Json.Linq;
diff --git a/src/SMAPI/Framework/Singleton.cs b/src/SMAPI/Framework/Singleton.cs
index 1bf318c4..da16c48e 100644
--- a/src/SMAPI/Framework/Singleton.cs
+++ b/src/SMAPI/Framework/Singleton.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework
 {
     /// <summary>Provides singleton instances of a given type.</summary>
diff --git a/src/SMAPI/Framework/SnapshotDiff.cs b/src/SMAPI/Framework/SnapshotDiff.cs
index 5b6288ff..eb2aebe1 100644
--- a/src/SMAPI/Framework/SnapshotDiff.cs
+++ b/src/SMAPI/Framework/SnapshotDiff.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using StardewModdingAPI.Framework.StateTracking;
 
 namespace StardewModdingAPI.Framework
diff --git a/src/SMAPI/Framework/SnapshotItemListDiff.cs b/src/SMAPI/Framework/SnapshotItemListDiff.cs
index e8ab1b1e..97942783 100644
--- a/src/SMAPI/Framework/SnapshotItemListDiff.cs
+++ b/src/SMAPI/Framework/SnapshotItemListDiff.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using StardewModdingAPI.Events;
diff --git a/src/SMAPI/Framework/SnapshotListDiff.cs b/src/SMAPI/Framework/SnapshotListDiff.cs
index 1c3ebfba..1d585c15 100644
--- a/src/SMAPI/Framework/SnapshotListDiff.cs
+++ b/src/SMAPI/Framework/SnapshotListDiff.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using StardewModdingAPI.Framework.StateTracking;
 
diff --git a/src/SMAPI/Framework/StateTracking/ChestTracker.cs b/src/SMAPI/Framework/StateTracking/ChestTracker.cs
index 56aeeb3c..28335200 100644
--- a/src/SMAPI/Framework/StateTracking/ChestTracker.cs
+++ b/src/SMAPI/Framework/StateTracking/ChestTracker.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/StateTracking/Comparers/EquatableComparer.cs b/src/SMAPI/Framework/StateTracking/Comparers/EquatableComparer.cs
index a96ffdb6..987e1820 100644
--- a/src/SMAPI/Framework/StateTracking/Comparers/EquatableComparer.cs
+++ b/src/SMAPI/Framework/StateTracking/Comparers/EquatableComparer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
diff --git a/src/SMAPI/Framework/StateTracking/Comparers/GenericEqualsComparer.cs b/src/SMAPI/Framework/StateTracking/Comparers/GenericEqualsComparer.cs
index cc1d6553..f6b04583 100644
--- a/src/SMAPI/Framework/StateTracking/Comparers/GenericEqualsComparer.cs
+++ b/src/SMAPI/Framework/StateTracking/Comparers/GenericEqualsComparer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 
diff --git a/src/SMAPI/Framework/StateTracking/Comparers/ObjectReferenceComparer.cs b/src/SMAPI/Framework/StateTracking/Comparers/ObjectReferenceComparer.cs
index ef9adafb..8d3a7eb9 100644
--- a/src/SMAPI/Framework/StateTracking/Comparers/ObjectReferenceComparer.cs
+++ b/src/SMAPI/Framework/StateTracking/Comparers/ObjectReferenceComparer.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/BaseDisposableWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/BaseDisposableWatcher.cs
index 60006c51..03bf84d9 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/BaseDisposableWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/BaseDisposableWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableListWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableListWatcher.cs
index 256370ce..52e1dbad 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableListWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableListWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableWatcher.cs
index 5ca4b9f4..4f94294c 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/ComparableWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/ImmutableCollectionWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/ImmutableCollectionWatcher.cs
index 84340fbf..94ce0c8e 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/ImmutableCollectionWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/ImmutableCollectionWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetCollectionWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetCollectionWatcher.cs
index 676c9fb4..e662c433 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetCollectionWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetCollectionWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Netcode;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetDictionaryWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetDictionaryWatcher.cs
index e6882f7e..0d7f2ad2 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetDictionaryWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetDictionaryWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Netcode;
 
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetListWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetListWatcher.cs
index 0b4d3030..a97e754c 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetListWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetListWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Netcode;
 using StardewModdingAPI.Framework.StateTracking.Comparers;
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetValueWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetValueWatcher.cs
index 48d5d681..26641750 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/NetValueWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/NetValueWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Netcode;
 
 namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/ObservableCollectionWatcher.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/ObservableCollectionWatcher.cs
index 3e9fa8b1..82e5387e 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/ObservableCollectionWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/ObservableCollectionWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
diff --git a/src/SMAPI/Framework/StateTracking/FieldWatchers/WatcherFactory.cs b/src/SMAPI/Framework/StateTracking/FieldWatchers/WatcherFactory.cs
index bde43486..0b99914c 100644
--- a/src/SMAPI/Framework/StateTracking/FieldWatchers/WatcherFactory.cs
+++ b/src/SMAPI/Framework/StateTracking/FieldWatchers/WatcherFactory.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
diff --git a/src/SMAPI/Framework/StateTracking/ICollectionWatcher.cs b/src/SMAPI/Framework/StateTracking/ICollectionWatcher.cs
index 7a7759e3..74c9313b 100644
--- a/src/SMAPI/Framework/StateTracking/ICollectionWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/ICollectionWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 
 namespace StardewModdingAPI.Framework.StateTracking
diff --git a/src/SMAPI/Framework/StateTracking/IDictionaryWatcher.cs b/src/SMAPI/Framework/StateTracking/IDictionaryWatcher.cs
index 691ed377..81fb7460 100644
--- a/src/SMAPI/Framework/StateTracking/IDictionaryWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/IDictionaryWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 
 namespace StardewModdingAPI.Framework.StateTracking
diff --git a/src/SMAPI/Framework/StateTracking/IValueWatcher.cs b/src/SMAPI/Framework/StateTracking/IValueWatcher.cs
index 4afca972..7d46053c 100644
--- a/src/SMAPI/Framework/StateTracking/IValueWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/IValueWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 namespace StardewModdingAPI.Framework.StateTracking
 {
     /// <summary>A watcher which tracks changes to a value.</summary>
diff --git a/src/SMAPI/Framework/StateTracking/IWatcher.cs b/src/SMAPI/Framework/StateTracking/IWatcher.cs
index 8c7fa51c..3603b6f8 100644
--- a/src/SMAPI/Framework/StateTracking/IWatcher.cs
+++ b/src/SMAPI/Framework/StateTracking/IWatcher.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 
 namespace StardewModdingAPI.Framework.StateTracking
diff --git a/src/SMAPI/Framework/StateTracking/LocationTracker.cs b/src/SMAPI/Framework/StateTracking/LocationTracker.cs
index f86f86ee..9c2ff7f0 100644
--- a/src/SMAPI/Framework/StateTracking/LocationTracker.cs
+++ b/src/SMAPI/Framework/StateTracking/LocationTracker.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/StateTracking/PlayerTracker.cs b/src/SMAPI/Framework/StateTracking/PlayerTracker.cs
index 3d470b5c..367eafea 100644
--- a/src/SMAPI/Framework/StateTracking/PlayerTracker.cs
+++ b/src/SMAPI/Framework/StateTracking/PlayerTracker.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/StateTracking/Snapshots/LocationSnapshot.cs b/src/SMAPI/Framework/StateTracking/Snapshots/LocationSnapshot.cs
index 2563d10c..3d13f92b 100644
--- a/src/SMAPI/Framework/StateTracking/Snapshots/LocationSnapshot.cs
+++ b/src/SMAPI/Framework/StateTracking/Snapshots/LocationSnapshot.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using Microsoft.Xna.Framework;
 using StardewValley;
diff --git a/src/SMAPI/Framework/StateTracking/Snapshots/PlayerSnapshot.cs b/src/SMAPI/Framework/StateTracking/Snapshots/PlayerSnapshot.cs
index e113d27c..bf81a35e 100644
--- a/src/SMAPI/Framework/StateTracking/Snapshots/PlayerSnapshot.cs
+++ b/src/SMAPI/Framework/StateTracking/Snapshots/PlayerSnapshot.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs b/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs
index afea7fb4..1d43ef26 100644
--- a/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs
+++ b/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using Microsoft.Xna.Framework;
 using StardewValley;
 using StardewValley.Menus;
diff --git a/src/SMAPI/Framework/StateTracking/Snapshots/WorldLocationsSnapshot.cs b/src/SMAPI/Framework/StateTracking/Snapshots/WorldLocationsSnapshot.cs
index 7dee09ca..88aac0df 100644
--- a/src/SMAPI/Framework/StateTracking/Snapshots/WorldLocationsSnapshot.cs
+++ b/src/SMAPI/Framework/StateTracking/Snapshots/WorldLocationsSnapshot.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Linq;
 using StardewModdingAPI.Framework.StateTracking.Comparers;
diff --git a/src/SMAPI/Framework/StateTracking/WorldLocationsTracker.cs b/src/SMAPI/Framework/StateTracking/WorldLocationsTracker.cs
index e968d79c..ab02d7d5 100644
--- a/src/SMAPI/Framework/StateTracking/WorldLocationsTracker.cs
+++ b/src/SMAPI/Framework/StateTracking/WorldLocationsTracker.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Linq;
diff --git a/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs b/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs
index c0f119f1..5f0ecfa0 100644
--- a/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs
+++ b/src/SMAPI/Framework/TemporaryHacks/MiniMonoModHotfix.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 // This temporary utility fixes an esoteric issue in XNA Framework where deserialization depends on
 // the order of fields returned by Type.GetFields, but that order changes after Harmony/MonoMod use
 // reflection to access the fields due to an issue in .NET Framework.
diff --git a/src/SMAPI/Framework/Translator.cs b/src/SMAPI/Framework/Translator.cs
index 4492b17f..144b043c 100644
--- a/src/SMAPI/Framework/Translator.cs
+++ b/src/SMAPI/Framework/Translator.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/SMAPI/Framework/Utilities/ContextHash.cs b/src/SMAPI/Framework/Utilities/ContextHash.cs
index 6c0fdc90..46b9099e 100644
--- a/src/SMAPI/Framework/Utilities/ContextHash.cs
+++ b/src/SMAPI/Framework/Utilities/ContextHash.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/Utilities/Countdown.cs b/src/SMAPI/Framework/Utilities/Countdown.cs
index 342b4258..94c69e73 100644
--- a/src/SMAPI/Framework/Utilities/Countdown.cs
+++ b/src/SMAPI/Framework/Utilities/Countdown.cs
@@ -1,4 +1,4 @@
-namespace StardewModdingAPI.Framework.Utilities
+namespace StardewModdingAPI.Framework.Utilities
 {
     /// <summary>Counts down from a baseline value.</summary>
     internal class Countdown
diff --git a/src/SMAPI/Framework/Utilities/TickCacheDictionary.cs b/src/SMAPI/Framework/Utilities/TickCacheDictionary.cs
index d0f276d2..94ce0069 100644
--- a/src/SMAPI/Framework/Utilities/TickCacheDictionary.cs
+++ b/src/SMAPI/Framework/Utilities/TickCacheDictionary.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System;
 using System.Collections.Generic;
 
diff --git a/src/SMAPI/Framework/WatcherCore.cs b/src/SMAPI/Framework/WatcherCore.cs
index a1612e75..bd8d3367 100644
--- a/src/SMAPI/Framework/WatcherCore.cs
+++ b/src/SMAPI/Framework/WatcherCore.cs
@@ -1,3 +1,5 @@
+#nullable disable
+
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using Microsoft.Xna.Framework;