[eslint-config] [*] [readme] add note about ESLint --ext

Author: prateekbisht23

package.json

@@ -8,7 +8,6 @@
     "install:config": "cd packages/eslint-config-airbnb && npm prune && npm install",
     "install:config:base": "cd packages/eslint-config-airbnb-base && npm prune && npm install",
     "lint": "markdownlint --config linters/.markdownlint.json README.md */README.md",
-    "lint:js": "eslint -c linters/.eslintrc . --ext .js --ext .jsx",
     "pretest": "npm run --silent lint",
     "test": "npm run --silent test:config && npm run --silent test:config:base",
     "test:config": "cd packages/eslint-config-airbnb; npm test",
@@ -41,7 +40,6 @@
   },
   "homepage": "https://github.com/airbnb/javascript",
   "devDependencies": {
-    "eslint": "^8.57.1",
     "markdownlint": "^0.29.0",
     "markdownlint-cli": "^0.35.0",
     "rimraf": "^6.0.1"

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

@@ -62,12 +62,12 @@ Our default export contains all of our ESLint rules, including ECMAScript 6+. It
 
 2. Add `"extends": "airbnb-base"` to your .eslintrc.
 
-⚠️ **Note**: ESLint only lints `.js` files by default.  
-  
-  If your project uses `.jsx` (or `.tsx` with TypeScript), you need to pass extensions to the CLI:  
+> **Note**: ESLint only lints `.js` files by default.
+
+  If your project uses `.jsx` (or `.tsx` with TypeScript), you need to pass extensions to the CLI:
 
   ```sh
-  eslint . --ext .js,.jsx
+  eslint . --ext .js, .jsx, .mjs
   ```
 
   Without this, JSX-related rules will not apply to `.jsx` files.

packages/eslint-config-airbnb/README.md

@@ -58,11 +58,11 @@ If you don't need React, see [eslint-config-airbnb-base](https://npmjs.com/eslin
 
 2. Add `"extends": "airbnb"` to your `.eslintrc`
 
-⚠️ **Note**: ESLint only lints `.js` files by default.  
-  If your project uses `.jsx` (or `.tsx` with TypeScript), you need to pass extensions to the CLI:  
+> **Note**: ESLint only lints `.js` files by default.
+  If your project uses `.jsx` (or `.tsx` with TypeScript), you need to pass extensions to the CLI:
 
   ```sh
-  eslint . --ext .js,.jsx
+  eslint . --ext .js, .jsx, .mjs
   ```
 
   Without this, JSX-related rules will not apply to `.jsx` files.