Update circleci config

- use orb and auto caching feature

.circleci/config.yml

@@ -1,49 +1,49 @@
 version: 2.1
+
+orbs:
+  node: circleci/node@5.0.2
+
 jobs:
   prepare:
-    working_directory: ~/app
-    docker:
-      - image: 'circleci/node:latest'
+    executor: node/default
     steps:
       - checkout
-      - restore_cache:
-          key: dependency-cache-{{ checksum "yarn.lock" }}
-      - run: yarn install --frozen-lockfile
-      - save_cache:
-          key: dependency-cache-{{ checksum "yarn.lock" }}
-          paths:
-            - node_modules
+      - node/install-packages:
+          pkg-manager: yarn
       - persist_to_workspace:
-          root: ~/app
+          root: ~/project
           paths:
             - node_modules
+
   build:
-    working_directory: ~/app
-    docker:
-      - image: 'circleci/node:latest'
+    executor: node/default
     steps:
       - checkout
       - attach_workspace:
-          at: ~/app
+          at: ~/project
       - run: yarn build
+      - persist_to_workspace:
+          root: ~/project
+          paths:
+            - node_modules
+            - build
+
   lint:
-    working_directory: ~/app
-    docker:
-      - image: 'circleci/node:latest'
+    executor: node/default
     steps:
       - checkout
       - attach_workspace:
-          at: ~/app
+          at: ~/project
       - run: yarn lint
+
   package:
-    working_directory: ~/app
-    docker:
-      - image: 'circleci/node:latest'
+    executor: node/default
     steps:
       - checkout
       - attach_workspace:
-          at: ~/app
+          at: ~/project
       - run: yarn package
+
 workflows:
   version: 2
   build-test:

.editorconfig

@@ -13,3 +13,6 @@ tab_width = 2
 [*.md]
 trim_trailing_whitespace = false
 insert_final_newline = false
+
+[*.yml]
+indent_size = 2