Port the rest of the code

src/utils/region.ts

@@ -0,0 +1,30 @@
+import { getPref, Preferences, PrefKey } from "../modules/preferences";
+
+
+declare var States: BxStates;
+
+export function getPreferredServerRegion(shortName = false) {
+    let preferredRegion = getPref(PrefKey.SERVER_REGION);
+    if (preferredRegion in States.serverRegions) {
+        if (shortName && States.serverRegions[preferredRegion].shortName) {
+            return States.serverRegions[preferredRegion].shortName;
+        } else {
+            return preferredRegion;
+        }
+    }
+
+    for (let regionName in States.serverRegions) {
+        const region = States.serverRegions[regionName];
+        if (!region.isDefault) {
+            continue;
+        }
+
+        if (shortName && region.shortName) {
+            return region.shortName;
+        } else {
+            return regionName;
+        }
+    }
+
+    return '???';
+}