CircleCI v2 Yarn Configuration

config.yml

version: 2

jobs:
  build:
    working_directory: ~/my-github-project
    docker:
      - image: kkarczmarczyk/node-yarn
    steps:
      - checkout
      - restore_cache:
          key: my-github-project-{{ .Branch }}-{{ checksum "package.json" }}-{{ checksum "yarn.lock" }}
      - run:
          name: Install
          command: yarn
      - save_cache:
          key: my-github-project-{{ .Branch }}-{{ checksum "package.json" }}-{{ checksum "yarn.lock" }}
          paths:
            - ~/node_modules
      - run:
          name: Test
          command: yarn test
      - run:
          name: Release
          command: yarn run release

Make sure to replace my-github-project with the name of your project