update node & yarn

.circleci/config.yml

@@ -7,7 +7,7 @@ jobs:
   build:
     docker:
       # specify the version you desire here
-       - image: circleci/ruby:2.4.2-node
+       - image: circleci/ruby:2.4.2-node-browsers
 
       # Specify service dependencies here if necessary
       # CircleCI maintains a library of pre-built images
@@ -42,6 +42,14 @@ jobs:
           key: v1-dependencies-{{ checksum "Gemfile.lock" }}
 
       # Frontend setup
+      - run:
+          name: "Node.js と npm を更新"
+          command: |
+            curl -sSL "https://nodejs.org/dist/v12.8.1/node-v12.8.1-linux-x64.tar.xz" | sudo tar --strip-components=2 -xJ -C /usr/local/bin/ node-v12.8.1-linux-x64/bin/node
+            curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -
+            echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
+            sudo apt-get update && sudo apt-get install yarn
+
       - run:
           name: build frontend
           working_directory: frontend