fix typings and edge config key issue

www/app/lib/edgeConfig.ts

@@ -0,0 +1,31 @@
+import { get } from "@vercel/edge-config";
+
+type EdgeConfig = {
+  [domainWithDash: string]: {
+    features: {
+      [featureName in "requireLogin" | "privacy" | "browse"]: boolean;
+    };
+    auth_callback_url: string;
+    api_url: string;
+  };
+};
+
+export type DomainConfig = EdgeConfig["domainWithDash"];
+
+// Edge config main keys can only be alphanumeric and _ or -
+export function edgeKeyToDomain(key: string) {
+  return key.replaceAll(".", "_");
+}
+
+export function edgeDomainToKey(domain: string) {
+  return domain.replaceAll("_", ".");
+}
+
+// get edge config server-side (prefer DomainContext when available), domain is the hostname
+export async function getConfig(domain: string) {
+  const config = await get(edgeDomainToKey(domain));
+
+  if (typeof config !== "object") throw Error("Error fetchig config");
+
+  return config as DomainConfig;
+}