fix

.eslintrc.for-vscode.js

@@ -0,0 +1,9 @@
+module.exports = {
+  extends: [require.resolve("./.eslintrc.js")],
+  overrides: [
+    {
+      files: ["tests/lib/rules/*"],
+      extends: ["plugin:eslint-rule-tester/recommended-legacy"],
+    },
+  ],
+};

.vscode/settings.json

@@ -9,6 +9,9 @@
     "markdown",
     "yaml"
   ],
+  "eslint.options": {
+    "overrideConfigFile": "./.eslintrc.for-vscode.js"
+  },
   "typescript.validate.enable": true,
   "javascript.validate.enable": false,
   "vetur.validation.script": false,

package.json

@@ -99,6 +99,7 @@
     "eslint-config-prettier": "^9.0.0",
     "eslint-plugin-eslint-comments": "^3.2.0",
     "eslint-plugin-eslint-plugin": "^5.0.0",
+    "eslint-plugin-eslint-rule-tester": "^0.5.1",
     "eslint-plugin-json-schema-validator": "^4.6.1",
     "eslint-plugin-jsonc": "^2.0.0",
     "eslint-plugin-markdown": "^3.0.0",

tests/lib/rules/no-useless-escape.ts

@@ -15,17 +15,38 @@ tester.run("no-useless-escape", rule as any, {
     {
       filename: "test.json",
       code: '"hol\\a"',
-      errors: ["Unnecessary escape character: \\a."],
+      errors: [
+        {
+          message: "Unnecessary escape character: \\a.",
+          suggestions: [
+            { messageId: "removeEscape", output: `"hola"` },
+            { messageId: "escapeBackslash", output: String.raw`"hol\\a"` },
+          ],
+        },
+      ],
     },
     {
       filename: "test.vue",
       code: `<custom-block lang="json">"hol\\a"</custom-block>`,
-      errors: ["Unnecessary escape character: \\a."],
-      ...({
-        languageOptions: {
-          parser: vueParser,
+      errors: [
+        {
+          message: "Unnecessary escape character: \\a.",
+          suggestions: [
+            {
+              messageId: "removeEscape",
+              output: `<custom-block lang="json">"hola"</custom-block>`,
+            },
+            {
+              messageId: "escapeBackslash",
+              output: String.raw`<custom-block lang="json">"hol\\a"</custom-block>`,
+            },
+          ],
         },
-      } as any),
+      ],
+      // @ts-expect-error
+      languageOptions: {
+        parser: vueParser,
+      },
     },
   ],
 });