[all hosts] (Developer Experience) Adjust lint configuration for eslint v9 (#5006)

* Adjust lint configuration for eslint v9

* Correct terminology around plugins object

Author: AlexJerabek

docs/overview/set-up-your-dev-environment.md

@@ -1,7 +1,7 @@
 ---
 title: Set up your development environment
 description:  Set up your developer environment to build Office Add-ins.
-ms.date: 12/12/2024
+ms.date: 01/27/2025
 ms.topic: install-set-up-deploy
 ms.localizationpriority: medium
 ---
@@ -70,17 +70,25 @@ If you created your project manually, install and configure the linter with the
    npm install eslint-plugin-office-addins --save-dev
    ```
 
-1. In the root of the project, create a text file named **.eslintrc.json**, if there isn't one already there. Be sure it has properties named `plugins` and `extends`, both of type array. The `plugins` array should include `"office-addins"` and the `extends` array should include `"plugin:office-addins/recommended"`. The following is a simple example. Your **.eslintrc.json** file may have additional properties and additional members of the two arrays.
-
-   ```json
-   {
-     "plugins": [
-       "office-addins"
-     ],
-     "extends": [
-       "plugin:office-addins/recommended"
-     ]
-   }
+1. In the root of the project, create a text file named **eslint.config.js** (or **.mjs**), if there isn't one already there. Be sure to inherit the recommended configuration for `eslint-plugin-office-addins`. The `plugins` object should include a mapping to the `eslint-plugin-office-addins` plugin object. The following is a simple example that includes settings for TypeScript. Your **eslint.config.js** file may have additional properties and configurations.
+
+   ```js
+    const officeAddins = require("eslint-plugin-office-addins");
+    const tsParser = require("@typescript-eslint/parser");
+    const tsEsLint = require("typescript-eslint");
+    
+    export default [
+      ...tsEsLint.configs.recommended,
+      ...officeAddins.configs.recommended,
+      {
+        plugins: {
+          "office-addins": officeAddins,
+        },
+        languageOptions: {
+          parser: tsParser,
+        },
+      },
+    ];
    ```
 
 1. In the root of the project, open the **package.json** file and be sure that the `scripts` array has the following member.