language: node_js
cache: npm

# Trigger a push build on master and greenkeeper branches + PRs build on every branches
# Avoid double build on PRs (See https://github.com/travis-ci/travis-ci/issues/1147)
branches:
  only:
    - master
    - /^greenkeeper.*$/
    - beta # semantic-release preview releases
    - next # semantic-release @next releases
    - /^\d+\.x$/ # semantic-release maintenance releases

stages:
  - lint
  - test
  - name: release
    if: branch =~ /^(\d+\.x|master|next|beta)$/ AND type IN (push)
  - name: update-prettier
    if: branch =~ ^greenkeeper/prettier

jobs:
  include:
    - stage: update-prettier
      node_js: lts/*
      script:
        - git checkout $TRAVIS_BRANCH
        - npm run prettier
        # commit changes and push back to branch on GitHub. If there are no changes then exit without error
        - 'git commit -a -m "style: prettier" && git push "https://${GH_TOKEN}@github.com/$TRAVIS_REPO_SLUG" ${TRAVIS_BRANCH} || true'
    - stage: lint
      node_js: lts/*
      env: linting
      # Show prettier errors, even if lint fails.
      script: run-s --silent --continue-on-error lint prettier:check dtslint
    - stage: test
      node_js: 12
    - node_js: 10
      # Avoid running lint and prettier again.
      script: npm run --silent unit
    - node_js: 8
      # Avoid running lint and prettier again.
      script: npm run --silent unit
    - stage: release
      node_js: lts/*
      env: semantic-release
      script: npm run semantic-release