chore: CircleCI linter and unit tests

.circleci/config.yml

@@ -0,0 +1,37 @@
+version: 2.1
+
+parameters:
+  NODE_IMAGE:
+    type: string
+    default: '16.14.2'
+
+jobs:
+  build:
+    docker:
+      - image: cimg/node:<< pipeline.parameters.NODE_IMAGE >>
+
+    working_directory: ~/repo
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          keys:
+            - dependencies-{{ checksum "package-lock.json" }}
+
+      - run:
+          name: Installing dependencies
+          command: npm install
+
+      - save_cache:
+          paths:
+            - node_modules
+          key: dependencies-{{ checksum "package-lock.json" }}
+
+      - run:
+          name: Running linters
+          command: npm run lint
+
+      - run:
+          name: Running unit tests
+          command: npm test