Initial

resources/app/client/apps/forms/default-sheets-config.js

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+/**
+ * An Application responsible for allowing GMs to configure the default sheets that are used for the Documents in their
+ * world.
+ */
+class DefaultSheetsConfig extends PackageConfiguration {
+  /** @inheritdoc */
+  static get defaultOptions() {
+    return foundry.utils.mergeObject(super.defaultOptions, {
+      title: game.i18n.localize("SETTINGS.DefaultSheetsL"),
+      id: "default-sheets-config",
+      categoryTemplate: "templates/sidebar/apps/default-sheets-config.html",
+      submitButton: true
+    });
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  _prepareCategoryData() {
+    let total = 0;
+    const categories = [];
+    for ( const cls of Object.values(foundry.documents) ) {
+      const documentName = cls.documentName;
+      if ( !cls.hasTypeData ) continue;
+      const subTypes = game.documentTypes[documentName].filter(t => t !== CONST.BASE_DOCUMENT_TYPE);
+      if ( !subTypes.length ) continue;
+      const title = game.i18n.localize(cls.metadata.labelPlural);
+      categories.push({
+        title,
+        id: documentName,
+        count: subTypes.length,
+        subTypes: subTypes.map(t => {
+          const typeLabel = CONFIG[documentName].typeLabels?.[t];
+          const name = typeLabel ? game.i18n.localize(typeLabel) : t;
+          const {defaultClasses, defaultClass} = DocumentSheetConfig.getSheetClassesForSubType(documentName, t);
+          return {type: t, name, defaultClasses, defaultClass};
+        })
+      });
+      total += subTypes.length;
+    }
+    return {categories, total};
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  async _updateObject(event, formData) {
+    const current = game.settings.get("core", "sheetClasses");
+    const settings = Object.entries(formData).reduce((obj, [name, sheetId]) => {
+      const [documentName, ...rest] = name.split(".");
+      const subType = rest.join(".");
+      const cfg = CONFIG[documentName].sheetClasses?.[subType]?.[sheetId];
+      // Do not create an entry in the settings object if the class is already the default.
+      if ( cfg?.default && !current[documentName]?.[subType] ) return obj;
+      const entry = obj[documentName] ??= {};
+      entry[subType] = sheetId;
+      return obj;
+    }, {});
+    return game.settings.set("core", "sheetClasses", settings);
+  }
+
+  /* -------------------------------------------- */
+
+  /** @inheritdoc */
+  async _onResetDefaults(event) {
+    event.preventDefault();
+    await game.settings.set("core", "sheetClasses", {});
+    return SettingsConfig.reloadConfirm({world: true});
+  }
+}