just so much groundwork

lib/resources.ts

@@ -0,0 +1,38 @@
+export class ResourceManager {
+  private resources: Map<string, unknown> = new Map();
+  private statuses: Map<string, Promise<boolean>> = new Map();
+
+  get<T>(name: string): T {
+    if (!this.resources.has(name)) {
+      throw new Error(`Resource ${name} not found`);
+    }
+    return this.resources.get(name) as T;
+  }
+
+  set(name: string, value: unknown) {
+    if (typeof (value as EventSource).addEventListener === "function") {
+      this.statuses.set(
+        name,
+        new Promise((resolve) => {
+          const onload = () => {
+            this.resources.set(name, value);
+            resolve(true);
+            (value as EventSource).removeEventListener("load", onload);
+          };
+          (value as EventSource).addEventListener("load", onload);
+        }),
+      );
+    } else {
+      console.warn("Resource added was not a loadable resource");
+    }
+    this.resources.set(name, value);
+  }
+
+  delete(name: string) {
+    this.resources.delete(name);
+  }
+
+  ready() {
+    return Promise.all(Array.from(this.statuses.values()));
+  }
+}