language: node_js
node_js:
  - "4"
  - "6"
  - "8"
  - "9"

env:
  - CXX=g++-4.8

addons:
    apt:
      sources:
        - ubuntu-toolchain-r-test
      packages:
        - g++-4.8

cache:
  directories:
    - $HOME/.npm
    - node_modules

before_install:
  - npm install -g npm@4
  - npm install -g coveralls

install:
  - npm prune
  - npm install

script:
  # Both test & coverage.
  - npm run travis

after_install:
  - coveralls < ./coverage/lcov.info || true # ignore coveralls error

# Allow Travis tests to run in containers.
sudo: false