chore: init clean tree

src/renderer/lazy-resource.ts

@@ -0,0 +1,45 @@
+export type LazyResource<T> = {
+	load: () => Promise<T>;
+	unload: () => void;
+	isLoaded: () => boolean;
+};
+
+export function createLazyResource<T>(
+	loader: () => Promise<T>,
+	dispose?: (value: T) => void
+): LazyResource<T> {
+	let cached: T | null = null;
+	let inflight: Promise<T> | null = null;
+
+	const load = async (): Promise<T> => {
+		if (cached) return cached;
+		if (inflight) return inflight;
+
+		inflight = (async () => {
+			const value = await loader();
+			cached = value;
+			inflight = null;
+			return value;
+		})();
+
+		return inflight;
+	};
+
+	const unload = () => {
+		if (cached && dispose) {
+			try {
+				dispose(cached);
+			} catch (error) {
+				console.error("[lazy-resource] failed to dispose resource", error);
+			}
+		}
+		cached = null;
+		inflight = null;
+	};
+
+	return {
+		load,
+		unload,
+		isLoaded: () => cached !== null
+	};
+}