switch to using TypeScript

src/module/actor/actor.ts

@@ -0,0 +1,38 @@
+/**
+ * Extend the base Actor entity by defining a custom roll data structure which is ideal for the Simple system.
+ * @extends {Actor}
+ */
+export class DS4Actor extends Actor {
+    /** @override */
+    prepareDerivedData() {
+        const data = this.data;
+        this._prepareCombatValues(data);
+    }
+
+    _prepareCombatValues(data) {
+        const hitPointsModifier = getProperty(data, "data.combatValues.hitPoints.modifier") || 0;
+        setProperty(
+            data,
+            "data.combatValues.hitPoints.max",
+            data.data.attributes.body.initial + data.data.traits.constitution.initial + 10 + hitPointsModifier
+        );
+
+        const defenseModifier = getProperty(data, "data.combatValues.defense.modifier") || 0;
+        setProperty(
+            data,
+            "data.combatValues.defense.value",
+            data.data.attributes.body.initial +
+                data.data.traits.constitution.initial +
+                this._getArmorValue() +
+                defenseModifier
+        );
+    }
+
+    _getArmorValue() {
+        return this.data["items"]
+            .filter((item) => ["armor", "shield"].includes(item.type))
+            .filter((item) => item.data.equipped)
+            .map((item) => item.data.armorValue)
+            .reduce((a, b) => a + b, 0);
+    }
+}