ci: add prettier linting

.husky/pre-commit

@@ -1 +1,2 @@
 npm run lint
+npm run format:check

.prettierignore

@@ -0,0 +1,11 @@
+# Add files here to ignore them from prettier formatting
+
+**/package-lock.json
+
+**/*.js
+**/*.?js
+**/*.ts
+**/*.?ts
+**/*.md
+
+test-project/cypress/

.prettierrc.json

@@ -0,0 +1,9 @@
+{
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": false,
+  "trailingComma": "all",
+  "arrowParens": "always",
+  "singleQuote": true
+}

CONTRIBUTING.md

@@ -32,6 +32,7 @@ To add a new rule:
 * Run `eslint-doc-generator` to generate automated documentation sections (see [Document generation](#document-generation) below)
 * Review documentation changes
 * Run `npm run lint`
+* Run `npm run format`
 * Run `npm test` to run [Vitest](https://vitest.dev/)
 * Make sure all tests are passing
 * Add the rule to [flat.js](https://github.com/cypress-io/eslint-plugin-cypress/blob/master/lib/flat.js)

circle.yml

@@ -48,8 +48,11 @@ jobs:
           name: Show ESLint version
           command: npx eslint --version
       - run:
-          name: Lint code
+          name: Lint code with ESLint
           command: npm run lint
+      - run:
+          name: Lint code with Prettier
+          command: npm run format:check
 
   test-v9:
     executor: docker-executor

package.json

@@ -39,12 +39,15 @@
     "eslint-plugin-eslint-plugin": "^6.4.0",
     "eslint-plugin-mocha": "^11.1.0",
     "husky": "^9.1.7",
+    "prettier": "^3.5.3",
     "semantic-release": "24.2.5",
     "vitest": "^3.1.4"
   },
   "scripts": {
     "lint": "eslint",
     "lint-fix": "eslint --fix",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
     "semantic-release": "semantic-release",
     "test": "vitest run",
     "prepare": "husky"