refactor: make Structure#deleted a getter to a WeakSet (#7074)

src/structures/Role.js

@@ -6,6 +6,13 @@ const Permissions = require('../util/Permissions');
 const SnowflakeUtil = require('../util/SnowflakeUtil');
 const Util = require('../util/Util');
 
+/**
+ * @type {WeakSet<Role>}
+ * @private
+ * @internal
+ */
+const deletedRoles = new WeakSet();
+
 /**
  * Represents a role on Discord.
  * @extends {Base}
@@ -32,12 +39,6 @@ class Role extends Base {
      */
     this.unicodeEmoji = null;
 
-    /**
-     * Whether the role has been deleted
-     * @type {boolean}
-     */
-    this.deleted = false;
-
     if (data) this._patch(data);
   }
 
@@ -146,6 +147,19 @@ class Role extends Base {
     return new Date(this.createdTimestamp);
   }
 
+  /**
+   * Whether or not the role has been deleted
+   * @type {boolean}
+   */
+  get deleted() {
+    return deletedRoles.has(this);
+  }
+
+  set deleted(value) {
+    if (value) deletedRoles.add(this);
+    else deletedRoles.delete(this);
+  }
+
   /**
    * The hexadecimal version of the role color, with a leading hashtag
    * @type {string}
@@ -462,7 +476,8 @@ class Role extends Base {
   }
 }
 
-module.exports = Role;
+exports.Role = Role;
+exports.deletedRoles = deletedRoles;
 
 /**
  * @external APIRole