Custom Discriminator in EditUsernameModalBody

ts/types/Toast.tsx

@@ -48,6 +48,7 @@ export enum ToastType {
   UnsupportedMultiAttachment = 'UnsupportedMultiAttachment',
   UnsupportedOS = 'UnsupportedOS',
   UserAddedToGroup = 'UserAddedToGroup',
+  WhoCanFindMeReadOnly = 'WhoCanFindMeReadOnly',
 }
 
 export type AnyToast =
@@ -108,4 +109,5 @@ export type AnyToast =
   | {
       toastType: ToastType.UserAddedToGroup;
       parameters: { contact: string; group: string };
-    };
+    }
+  | { toastType: ToastType.WhoCanFindMeReadOnly };

ts/types/Username.ts

@@ -16,6 +16,9 @@ export enum ReserveUsernameError {
   TooManyCharacters = 'TooManyCharacters',
   CheckStartingCharacter = 'CheckStartingCharacter',
   CheckCharacters = 'CheckCharacters',
+  NotEnoughDiscriminator = 'NotEnoughDiscriminator',
+  AllZeroDiscriminator = 'AllZeroDiscriminator',
+  LeadingZeroDiscriminator = 'LeadingZeroDiscriminator',
 }
 
 export enum ConfirmUsernameResult {
@@ -41,11 +44,18 @@ export function getNickname(username: string): string | undefined {
   return match[1];
 }
 
-export function getDiscriminator(username: string): string {
-  const match = username.match(/(\..*)$/);
+export function getDiscriminator(username: string): string | undefined {
+  const match = username.match(/\.([0-9]*)$/);
   if (!match) {
-    return '';
+    return undefined;
   }
 
   return match[1];
 }
+
+export function isCaseChange({
+  previousUsername,
+  username,
+}: UsernameReservationType): boolean {
+  return previousUsername?.toLowerCase() === username.toLowerCase();
+}