add ERR_ERRONEUSNICKNAME handler

src/irc.ts

@@ -248,7 +248,28 @@ export class IRCConnectionWrapper
         }
         break;
       }
-      case '433': // ERR_NICKNAMEINUSE
+      case '432': {
+        // ERR_ERRONEUSNICKNAME
+        // No backing away from this, we don't know what is wrong exactly.
+        if (!this.authenticated) {
+          this.emit('error', {
+            error: new Error('Invalid nickname'),
+            fatal: true,
+          });
+          this.connection?.destroy();
+          return;
+        }
+
+        const resetNick = line.arguments[0];
+        this.emit('nick', {
+          oldNick: this.options.nick,
+          newNick: resetNick,
+        });
+        this.options.nick = resetNick;
+        break;
+      }
+      case '433': {
+        // ERR_NICKNAMEINUSE
         const newNick = this.options.nick + '_';
         this.write('NICK %s', newNick);
 
@@ -259,6 +280,7 @@ export class IRCConnectionWrapper
 
         this.options.nick = newNick;
         break;
+      }
       case '902': // ERR_NICKLOCKED
       case '904': // ERR_SASLFAIL
       case '905': // ERR_SASLTOOLONG