version: 2

common_steps: &common_steps
    steps:
      - checkout

      - run:
          name: Install dependencies
          command: npm install

      - run:
          name: Run tests
          command: npm run mocha

      - run:
          name: Check Typescript types
          command: npm run check-types
          when: always

jobs:
  node-8:
    docker:
      - image: circleci/node:8

    <<: *common_steps

  node-10:
    docker:
      - image: circleci/node:10

    <<: *common_steps

  node-11:
    docker:
      - image: circleci/node:11

    <<: *common_steps

  node-12:
    docker:
      - image: circleci/node:12

    <<: *common_steps

workflows:
  version: 2

  on-commit:
    jobs:
      - node-8
      - node-10
      - node-11
      - node-12