refactor: replace ignored numeric literals with constants

src/modules/auth/presentation/auth.dto.ts

@@ -7,6 +7,9 @@ import {
   ValidatorConstraint,
 } from 'class-validator';
 
+const EMAIL_PART_COUNT = 2;
+const FIRST_CHARACTER_INDEX = 0;
+
 const MAX_EMAIL_LENGTH = 254;
 const ASCII_SPACE = 32;
 const ASCII_DELETE = 127;
@@ -19,14 +22,14 @@ class EmailConstraint {
     return (
       typeof value === 'string' &&
       value.length <= MAX_EMAIL_LENGTH &&
-      value.split('@').length === 2 &&
+      value.split('@').length === EMAIL_PART_COUNT &&
       !value
         .split('')
         .some(
           (character) =>
             /\s/.test(character) ||
-            character.charCodeAt(0) < ASCII_SPACE ||
-            character.charCodeAt(0) === ASCII_DELETE,
+            character.charCodeAt(FIRST_CHARACTER_INDEX) < ASCII_SPACE ||
+            character.charCodeAt(FIRST_CHARACTER_INDEX) === ASCII_DELETE,
         ) &&
         value.split('@').every(Boolean)
     );