Modding:Migrate to SMAPI 2.0

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In rare cases, SMAPI needs to change the interfaces it exposes to mods. (This doesn't happen often, because SMAPI strives to expose abstract interfaces that aren't tightly coupled to changes in the game.) When an interface does need to change, the old interface is deprecated and supported long enough to let mods update at their own pace.

How to update your mod

You don't need to comb through your code; SMAPI can tell you if you're using a deprecated interface:

1. Use the latest SMAPI for developers download. This will show all deprecation messages in the console:
   
2. When you look at the code, you'll see a deprecation warning with a hint of how to fix it:
   
3. Optionally, you can refer to the following sections on how to replace specific interfaces.

How deprecated interfaces are phased out

Deprecated interfaces are fully supported until their removal. They'll slowly move through these phases:

severity	description
notice	The interface is deprecated, but mod authors have time to update their mods. Nothing is reported to the console, though deprecation messages are shown in the log file.
info	Mods should no longer use the interface. Debug-level deprecation messages are shown in the console.
pending removal	Mods should no longer use the interface. Warning-level deprecation messages in the console indicate the mod will break soon if it doesn't update.

The interface will then be removed entirely.

Deprecated interfaces

These are currently deprecated:

since	interfaces	severity	replacement
1.0	Config class	info	see mod configuration.
1.0	Mod.BaseConfigPath	info	see mod configuration.
1.0	Mod.PathOnDisk	info	see mod configuration or use this.Helper.DirectoryPath.
1.0	Mod.PerSaveConfigFolder	info	use per-save JSON files instead.
1.0	Mod.PerSaveConfigPath	info	use per-save JSON files instead.
1.0	Mod.Entry(object[])	info	see mod entry method.
1.1	Log class	info	use the this.Monitor.Log mod method.
1.6	PlayerEvents.FarmerChanged	info	serves no purpose.
1.6	PlayerEvents.LoadedGame	info	use SaveEvents.AfterLoad.
1.6	TimeEvents.OnNewDay	info	unreliable and doesn't do what you think; use TimeEvents.DayOfMonthChanged to detect a day change, and SaveEvents.BeforeSave + SaveEvents.AfterSave to detect saves.
1.9	Command class	info	use this.Helper.ConsoleCommands.
1.10	GameEvents.Initialize	info	move any code into your Entry method.
1.10	GameEvents.LoadContent	info	move any code into your Entry method.

These have been removed:

deprecated	removed	interfaces	replacement
0.39.3	1.9¹	SObject class	reimplement if needed.
0.39.3	1.9¹	Extensions.ToSingular(…)	use string.Join.
1.0	1.9¹	Authour in manifest.json	use Author.
1.0	1.9¹	Extensions class	reimplement if needed, or use an extensions library.
1.0	1.9¹	LogWriter class	use this.Monitor.Log.
1.0	1.9¹	SPlayer class	use Game1.player.
1.1	1.9¹	Command.CallCommand(string)	use this.Helper.ConsoleCommands.
1.1	1.9¹	Mod.Entry(ModHelper)	change ModHelper to IModHelper.
1.5	1.9¹	Version class	use SemanticVersion.
1.5	1.9¹	Mod.Manifest	use Mod.ModManifest (changes type from Manifest to IManifest).
1.5	1.9¹	Constants.Version	use Constants.ApiVersion (changes type from Version to ISemanticVersion).
1.0 experimental API	1.9¹	IConfigFile and ConfigFile	reimplement if needed.

¹ Stardew Valley 1.2 broke many existing mods, so SMAPI 1.9 used the opportunity to remove the most rarely-used deprecated APIs.

Migration guides

This section provides more information for some migrations mentioned in the previous section.

Mod entry method

For the latest documentation, see Modding:Creating a SMAPI mod#Writing your mod code.

Change your mod's entry class from this:

/// <summary>Initialise the mod.</summary>
public override void Entry(params object[] objects)
{
    // your code
}

to this:

/// <summary>The mod entry point, called after the mod is first loaded.</summary>
/// <param name="helper">Provides simplified APIs for writing mods.</param>
public override void Entry(IModHelper helper)
{
    // your code
}

Mod configuration

For the latest documentation, see Modding:Creating a SMAPI mod#Configuration.

If you use config.json, it's much easier in 1.0.

1. Find your subclass of StardewModdingAPI.Config, which probably looks something like this:

   class SampleConfig : StardewModdingAPI.Config
   {
      public bool ExampleBoolean { get; set; }
      public float ExampleFloat { get; set; }
   
      public override T GenerateDefaultConfig<T>()
      {
         this.ExampleBoolean = true;
         this.ExampleFloat = 0.5;
         return this as T;
      }
   }
   

2. Edit this class as follows:
   • Move default values into the constructor or property setters.
   • Remove StardewModdingAPI.Config.
   • Remove all override methods.
3. Your class should now look something like this:

   class SampleConfig
   {
      public bool ExampleBoolean { get; set; } = true;
      public float ExampleFloat { get; set; } = 0.5;
   }
   

   or like this if you used a constructor:

   class SampleConfig
   {
      public bool ExampleBoolean { get; set; }
      public float ExampleFloat { get; set; }
   
      public SampleConfig()
      {
         this.ExampleBoolean = true;
         this.ExampleFloat = 0.5;
      }
   }
   

4. In your Mod class, change anything that looks like this:

   var config = new SampleConfig().InitializeConfig(this.BaseConfigPath);
   

   to this:

   var config = helper.ReadConfig<SampleConfig>();
   

5. If you use other methods, here's how to migrate them:

   before 1.0	after 1.0
   new SampleConfig().GenerateDefaultConfig() new SampleConfig().Instance()	new SampleConfig()
   new SampleConfig().InitializeConfig(this.BaseConfigPath) config.UpdateConfig() config.LoadConfig(this.BaseConfigPath) config.ReloadConfig()	helper.ReadConfig<SampleConfig>()
   config.WriteConfig()	helper.WriteConfig(config)

For more information, see Modding:Creating a SMAPI mod#Configuration.