Multiple deployments to multiple S3 buckets and single and final hook

.travis.yml

language: node_js
node_js:
  - 6

cache:
  directories:
    - dir_1/node_modules

before_install:
  - cd dir_1

install:
  # for invalidating CloudFront distribution
  - pip install --user awscli
  - npm install

script:
  - gulp
  - cd - # back to main directory

deploy:
  # access, secret keys, region are configured in TravisCI backend
  - provider: s3
    access_key_id: $AWS_ACCESS_KEY_ID
    secret_access_key: $AWS_SECRET_ACCESS_KEY
    region: $AWS_DEFAULT_REGION
    bucket: $AWS_S3_STATIC_BUCKET_NAME
    skip_cleanup: true
    local_dir: dir_1/dist
    on:
      branch: master

  - provider: s3
    access_key_id: $AWS_ACCESS_KEY_ID
    secret_access_key: $AWS_SECRET_ACCESS_KEY
    region: $AWS_DEFAULT_REGION
    bucket: $AWS_S3_WORLDWIDE_BUCKET_NAME
    skip_cleanup: true
    local_dir: dir_2
    on:
      branch: master

after_script:
  # allow `awscli` to make requests to CloudFront.
  - aws configure set preview.cloudfront true

  # invalidate all objects in the CloudFront distributions
  - aws cloudfront create-invalidation --distribution-id $AWS_CLOUDFRONT_1_DISTRIBUTION_ID --paths "/*"
  - aws cloudfront create-invalidation --distribution-id $AWS_CLOUDFRONT_2_DISTRIBUTION_ID --paths "/*"