An example CircleCI 2.0 config building with multiple versions of Node.js.

cci-node-multiversion-before-example.yml

workflows:
  version: 2
  main:
    jobs:
      - unit-node6
      - unit-node8
      - unit-node10
      - lint
      - integration
      - ui
      - prod_ui

version: 2
jobs:
  unit-node6:
    docker:
      - image: circleci/node:6
    steps:
      - checkout
      - restore_cache:
          name: Restore Yarn Package Cache
          keys:
            - yarn-packages-{{ checksum "yarn.lock" }}
      - run:
          name: "Unit test with Node.js 6"
          command: |
            yarn run bootstrap
            yarn jest -w 1
      - save_cache:
          name: Save Yarn Package Cache
          key: yarn-packages-{{ checksum "yarn.lock" }}
          paths:
            - ~/.cache/yarn

  unit-node8:
    docker:
      - image: circleci/node:8
    steps:
      - checkout
      - restore_cache:
          name: Restore Yarn Package Cache
          keys:
            - yarn-packages-{{ checksum "yarn.lock" }}
      - run:
          name: "Unit test with Node.js 8"
          command: |
            yarn run bootstrap
            yarn jest -w 1
      - save_cache:
          name: Save Yarn Package Cache
          key: yarn-packages-{{ checksum "yarn.lock" }}
          paths:
            - ~/.cache/yarn

  unit-node10:
    docker:
      - image: circleci/node:10
    steps:
      - checkout
      - restore_cache:
          name: Restore Yarn Package Cache
          keys:
            - yarn-packages-{{ checksum "yarn.lock" }}
      - run:
          name: "Unit test with Node.js 10"
          command: |
            yarn run bootstrap
            yarn jest -w 1
      - save_cache:
          name: Save Yarn Package Cache
          key: yarn-packages-{{ checksum "yarn.lock" }}
          paths:
            - ~/.cache/yarn

  lint:
    docker:
      - image: circleci/node:8
    steps:
      - checkout
      - run:
          name: "Lint Code"
          command: |
            yarn install
            yarn lint

  integration:
    docker:
      - image: circleci/node:8
    steps:
      - checkout
      - run:
          name: "Integration Tests"
          command: |
            yarn install
            yarn test:integration

  ui:
    docker:
      - image: circleci/node:8-browsers
    steps:
      - checkout
      - run:
          name: "UI Tests"
          command: |
            cd examples/my-js-repo
            yarn install
            yarn test

  prod_ui:
    docker:
      - image: circleci/node:8-browsers
    steps:
      - checkout
      - run:
          name: "UI Tests"
          command: |
            cd integration-tests/production-runtime
            yarn install
            yarn test