fix: actually fix immutability

Author: yyxi

.eslintrc.js

@@ -8,6 +8,8 @@ module.exports = {
     'escapace'
   ],
   rules: {
+    '@typescript-eslint/method-signature-style': 0,
+    'prefer-object-spread': 0,
     '@typescript-eslint/no-explicit-any': 0,
     '@typescript-eslint/space-before-function-paren': 0
   }