Cooldown

src/common/rpg/components/cooldown.ts

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+import { component } from "../core/registry";
+import { Component } from "../core/world";
+import { action, variable } from "../utils/decorators";
+
+@component
+export class Cooldown extends Component<{
+    remaining: number;
+    duration: number;
+}> {
+    constructor(duration: number) {
+        super({ remaining: duration, duration });
+    }
+
+    @variable('.')
+    get ready(): boolean {
+        return this.state.remaining <= 0;
+    }
+
+    @action
+    reset(duration?: number): void {
+        if (duration != null) this.state.duration = duration;
+        this.state.remaining = this.state.duration;
+    }
+
+    @action
+    clear(): void {
+        if (this.state.remaining <= 0) return;
+        this.state.remaining = 0;
+        this.emit('ready');
+    }
+
+    @action
+    update(dt: number): void {
+        if (this.state.remaining <= 0) return;
+        this.state.remaining -= dt;
+        if (this.state.remaining <= 0) {
+            this.state.remaining = 0;
+            this.emit('ready');
+        }
+    }
+}

src/common/rpg/systems/cooldownSystem.ts

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+import { Cooldown } from "../components/cooldown";
+import { System, type World } from "../core/world";
+
+export class CooldownSystem extends System {
+    override update(world: World, dt: number): void {
+        for (const [, , cooldown] of world.query(Cooldown)) {
+            cooldown.update(dt);
+        }
+    }
+}