chore: add code format check on CI

Author: bahmutov

.circleci/config.yml

@@ -5,7 +5,20 @@ orbs:
   node: circleci/[email protected] # used to publish new NPM version
 
 jobs:
+  unit:
+    description: Checks the code formatting
+    executor:
+      name: node/default
+      tag: '12'
+    steps:
+      - checkout
+      - node/with-cache:
+          steps:
+            - run: npm ci
+      - run: npm run format:check
+
   publish:
+    description: Publishes the new version of the plugin to NPM
     executor:
       name: node/default
       tag: '12'
@@ -19,6 +32,8 @@ jobs:
 workflows:
   build:
     jobs:
+      - unit
+
       - cypress/install:
           post-steps:
             - run: npm run check:markdown

package.json

@@ -13,6 +13,7 @@
     "report:coverage": "nyc report --reporter=html",
     "dev:no:coverage": "start-test 1234 'cypress open --env coverage=false'",
     "format": "prettier --write '*.js'",
+    "format:check": "prettier --check '*.js'",
     "start:test:backend": "nyc --silent node test-backend",
     "cy:backend": "cypress open --config-file cypress-backend.json",
     "dev:backend": "start-test start:test:backend 3003 cy:backend",