Fix bug

src/api/models/user.ts

@@ -8,9 +8,14 @@ const collection = db.get('users');
 export default collection as any; // fuck type definition
 
 export function validateUsername(username: string): boolean {
-	return /^[a-zA-Z0-9\-]{3,20}$/.test(username);
+	return typeof username == 'string' && /^[a-zA-Z0-9\-]{3,20}$/.test(username);
+}
+
+export function validatePassword(password: string): boolean {
+	return typeof password == 'string' && password != '';
 }
 
 export function isValidBirthday(birthday: string): boolean {
-	return /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday);
+	return typeof birthday == 'string' && /^([0-9]{4})\-([0-9]{2})-([0-9]{2})$/.test(birthday);
+}
 }