docs(readme): Add new configType option to readme

README.md

@@ -106,6 +106,25 @@ type cacheLocation = string;
 
 Specify the path to the cache location. Can be a file or a directory.
 
+### `configType`
+
+- Type:
+
+```ts
+type configType = "flat" | "eslintrc";
+```
+
+- Default: `eslintrc`
+
+Specify the type of configuration to use with ESLint.
+- `eslintrc` is the classic configuration format available in most ESLint versions.
+- `flat` is the new format introduced in ESLint 8.21.0.
+
+The new configuration format is explained in its [own documentation](https://eslint.org/docs/latest/use/configure/configuration-files-new).
+
+> This configuration format being considered as experimental, it is not exported in the main ESLint module in ESLint 8.
+> You need to set your `eslintPath` to `eslint/use-at-your-own-risk` for this config format to work.
+
 ### `context`
 
 - Type:

src/options.json

@@ -2,6 +2,10 @@
   "type": "object",
   "additionalProperties": true,
   "properties": {
+    "configType": {
+      "description": "Enable flat config by setting this value to `flat`.",
+      "type": "string"
+    },
     "context": {
       "description": "A string indicating the root of your files.",
       "type": "string"
@@ -58,10 +62,6 @@
       "description": "Will process and report errors only and ignore warnings, if set to `true`.",
       "type": "boolean"
     },
-    "configType": {
-      "description": "Enable flat config by setting this value to `flat`.",
-      "type": "string"
-    },
     "outputReport": {
       "description": "Write the output of the errors to a file, for example a checkstyle xml file for use for reporting on Jenkins CI",
       "anyOf": [