feat: migrate JavaScript files to TypeScript, enhancing type safety and maintainability across the codebase

src/systems/HealthRegenerationSystem.ts

@@ -0,0 +1,32 @@
+import { System } from '../core/System.ts';
+import { SystemName, ComponentType } from '../core/Constants.ts';
+import type { Entity } from '../core/Entity.ts';
+import type { Health } from '../components/Health.ts';
+
+/**
+ * System responsible for managing health regeneration for entities over time.
+ */
+export class HealthRegenerationSystem extends System {
+  constructor() {
+    super(SystemName.HEALTH_REGEN);
+    this.requiredComponents = [ComponentType.HEALTH];
+    this.priority = 35;
+  }
+
+  /**
+   * Process health regeneration for entities that haven't been damaged recently.
+   * @param deltaTime - Time elapsed since last frame in seconds
+   * @param entities - Entities matching system requirements
+   */
+  process(deltaTime: number, entities: Entity[]): void {
+    entities.forEach((entity) => {
+      const health = entity.getComponent<Health>(ComponentType.HEALTH);
+      if (!health || health.regeneration <= 0) return;
+
+      const timeSinceDamage = (Date.now() - health.lastDamageTime) / 1000;
+      if (timeSinceDamage > 5) {
+        health.heal(health.regeneration * deltaTime);
+      }
+    });
+  }
+}