refactor: use subclasses for different item types

src/item/armor/armor-data-properties.ts

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+// SPDX-FileCopyrightText: 2022 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
+import { DS4ItemDataPropertiesDataRollable } from "../item-data-properties-base";
+import { DS4ArmorDataSourceData } from "./armor-data-source";
+
+export interface DS4ArmorDataProperties {
+    type: "armor";
+    data: DS4ArmorDataPropertiesData;
+}
+
+interface DS4ArmorDataPropertiesData extends DS4ArmorDataSourceData, DS4ItemDataPropertiesDataRollable {}

src/item/armor/armor-data-source.ts

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+// SPDX-FileCopyrightText: 2022 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
+import { DS4 } from "../../config";
+import {
+    DS4ItemDataSourceDataBase,
+    DS4ItemDataSourceDataEquipable,
+    DS4ItemDataSourceDataPhysical,
+    DS4ItemDataSourceDataProtective,
+} from "../item-data-source-base";
+
+export interface DS4ArmorDataSource {
+    type: "armor";
+    data: DS4ArmorDataSourceData;
+}
+
+export interface DS4ArmorDataSourceData
+    extends DS4ItemDataSourceDataBase,
+        DS4ItemDataSourceDataPhysical,
+        DS4ItemDataSourceDataEquipable,
+        DS4ItemDataSourceDataProtective {
+    armorMaterialType: keyof typeof DS4.i18n.armorMaterialTypes;
+    armorType: keyof typeof DS4.i18n.armorTypes;
+}

src/item/armor/armor.ts

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+// SPDX-FileCopyrightText: 2022 Johannes Loher
+//
+// SPDX-License-Identifier: MIT
+
+import { DS4Item } from "../item";
+
+export class DS4Armor extends DS4Item {}
+
+export interface DS4Armor {
+    data: foundry.data.ItemData & { type: "armor"; _source: { type: "armor" } };
+}