.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node: [20.x, 19.x, 18.x, 17.x, 16.x, 14.x, 12.x, "12.22.0"]
+        node: [21.x, 20.x, 19.x, 18.x, 17.x, 16.x, 14.x, 12.x, "12.22.0"]
         include:
         - os: windows-latest
           node: "12.x"

CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## [2.1.3](https://github.com/eslint/eslintrc/compare/v2.1.2...v2.1.3) (2023-11-01)
+
+
+### Documentation
+
+* Add CommonJS example to README ([#134](https://github.com/eslint/eslintrc/issues/134)) ([ad511f8](https://github.com/eslint/eslintrc/commit/ad511f80971301199b74973fef196c8f6ebd36bc)), closes [#133](https://github.com/eslint/eslintrc/issues/133)
+
+
+### Chores
+
+* run tests in Node.js 21 ([#130](https://github.com/eslint/eslintrc/issues/130)) ([3b386f7](https://github.com/eslint/eslintrc/commit/3b386f790119553fb0d800b65454abf89b56a7aa))
+
 ## [2.1.2](https://github.com/eslint/eslintrc/compare/v2.1.1...v2.1.2) (2023-08-05)
 
 

README.md

@@ -16,7 +16,7 @@ npm install @eslint/eslintrc --save-dev
 yarn add @eslint/eslintrc -D
 ```
 
-## Usage
+## Usage (ESM)
 
 The primary class in this package is `FlatCompat`, which is a utility to translate ESLintRC-style configs into flat configs. Here's how you use it inside of your `eslint.config.js` file:
 
@@ -66,6 +66,50 @@ export default [
 ];
 ```
 
+## Usage (CommonJS)
+
+Using `FlatCompat` in CommonJS files is similar to ESM, but you'll use `require()` and `module.exports` instead of `import` and `export`. Here's how you use it inside of your `eslint.config.js` CommonJS file:
+
+```js
+const { FlatCompat } = require("@eslint/eslintrc");
+const js = require("@eslint/js");
+
+const compat = new FlatCompat({
+    baseDirectory: __dirname,                  // optional; default: process.cwd()
+    resolvePluginsRelativeTo: __dirname,       // optional
+    recommendedConfig: js.configs.recommended, // optional
+    allConfig: js.configs.all,                 // optional
+});
+
+module.exports = [
+
+    // mimic ESLintRC-style extends
+    ...compat.extends("standard", "example"),
+
+    // mimic environments
+    ...compat.env({
+        es2020: true,
+        node: true
+    }),
+
+    // mimic plugins
+    ...compat.plugins("airbnb", "react"),
+
+    // translate an entire config
+    ...compat.config({
+        plugins: ["airbnb", "react"],
+        extends: "standard",
+        env: {
+            es2020: true,
+            node: true
+        },
+        rules: {
+            semi: "error"
+        }
+    })
+];
+```
+
 ## License
 
 MIT License

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@eslint/eslintrc",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "The legacy ESLintRC config file format for ESLint",
   "type": "module",
   "main": "./dist/eslintrc.cjs",