CircleCi setup for monorepo: https://tech.julienkarst.com/how-to-setup-circleci-inside-a-monorepo

config.yml

workflows:
  version: 2

  # The main workflow will trigger other workflow based on your changes
  trigger:
    when: << pipeline.parameters.trigger >>
    jobs:
      - trigger-workflows
      - new_version:
          requires:
            - trigger-workflows
          filters:
            branches:
              only:
                - master

  # Workflows defined for each package.
  core:
    when: << pipeline.parameters.core >>
    jobs:
      - lint:
          package_name: core

  components:
    when: << pipeline.parameters.components >>
    jobs:
      - test:
          package_name: components
      - lint:
          package_name: components