Force curly if-statements

backend/.eslintrc

@@ -20,6 +20,7 @@
     "@typescript-eslint/no-this-alias": 1,
     "@typescript-eslint/no-var-requires": 1,
     "@typescript-eslint/explicit-function-return-type": 1,
+    "@typescript-eslint/no-unused-vars": 1,
     "no-console": 1,
     "no-constant-condition": 1,
     "no-dupe-else-if": 1,
@@ -32,6 +33,7 @@
     "prefer-rest-params": 1,
     "quotes": [1, "single", { "allowTemplateLiterals": true }],
     "semi": 1,
+    "curly": [1, "all"],
     "eqeqeq": 1
   }
 }