Add flat config support

Author: tamiroh

packages/eslint-config-airbnb-base/README.md

@@ -62,6 +62,18 @@ Our default export contains all of our ESLint rules, including ECMAScript 6+. It
 
 2. Add `"extends": "airbnb-base"` to your .eslintrc.
 
+  If using flat config, you can import `"eslint-config-airbnb-base/flat"` on your `eslint.config.mjs` file like this:
+
+  ```javascript
+  import airbnbBase from "eslint-config-airbnb-base/flat";
+
+  export default [
+    ...airbnbBase,
+    // Add your own configs
+  ];
+  ```
+
+
 ### eslint-config-airbnb-base/legacy
 
 Lints ES5 and below. Requires `eslint` and `eslint-plugin-import`.

packages/eslint-config-airbnb-base/flat.js

@@ -0,0 +1,26 @@
+const index = require('./index');
+const bestPractices = require('./rules/best-practices');
+const errors = require('./rules/errors');
+const node = require('./rules/flat/node');
+const style = require('./rules/style');
+const variables = require('./rules/variables');
+const es6 = require('./rules/flat/es6');
+const imports = require('./rules/flat/imports');
+const strict = require('./rules/strict');
+
+module.exports = [
+  bestPractices,
+  errors,
+  node,
+  style,
+  variables,
+  es6,
+  imports,
+  strict,
+  {
+    languageOptions: {
+      parserOptions: index.parserOptions,
+    },
+    rules: {},
+  }
+];

packages/eslint-config-airbnb-base/package.json

@@ -5,6 +5,7 @@
   "main": "index.js",
   "exports": {
     ".": "./index.js",
+    "./flat": "./flat.js",
     "./legacy": "./legacy.js",
     "./whitespace": "./whitespace.js",
     "./rules/best-practices": "./rules/best-practices.js",
@@ -87,6 +88,7 @@
     "node": "^10.12.0 || >=12.0.0"
   },
   "dependencies": {
-    "confusing-browser-globals": "^1.0.11"
+    "confusing-browser-globals": "^1.0.11",
+    "globals": "^15.12.0"
   }
 }

packages/eslint-config-airbnb-base/rules/flat/es6.js

@@ -0,0 +1,12 @@
+const es6 = require('../es6');
+const globals = require('globals');
+
+module.exports = {
+  languageOptions: {
+    globals: {
+      ...globals.es2015,
+    },
+    parserOptions: es6.parserOptions,
+  },
+  rules: es6.rules,
+};

packages/eslint-config-airbnb-base/rules/flat/imports.js

@@ -0,0 +1,17 @@
+const importPlugin = require('eslint-plugin-import');
+const globals = require('globals');
+const imports = require('../imports');
+
+module.exports = {
+  languageOptions: {
+    globals: {
+      ...globals.es2015,
+    },
+    parserOptions: imports.parserOptions,
+  },
+  plugins: {
+    import: importPlugin
+  },
+  settings: imports.settings,
+  rules: imports.rules,
+};

packages/eslint-config-airbnb-base/rules/flat/node.js

@@ -0,0 +1,11 @@
+const globals = require('globals');
+const node = require('../node');
+
+module.exports = {
+  languageOptions: {
+    globals: {
+      ...globals.es2015,
+    }
+  },
+  rules: node.rules,
+};