.travis.yml

# ensure running in a container for fast boot, travis has these requirements:
sudo: false
dist: "trusty"

# these are executed in order. each must pass for the next to be run
stages:
  - precache # warm up cache for default Node.js version
  - lint # lint code and docs
  - test # all tests

# defaults
language: node_js
node_js: "node" # equivalent to stable, node 10

# `nvm install` happens before the cache is restored, which means
# we must install our own npm elsewhere (`~/cached-bins`)
before_install: |
  # Evaluate with Bash if the npm in cached_bins path has NOT execution permission,
  [[ ! -x ~/cached-bins/node_modules/.bin/npm ]] && {
  # then we assume cache missed and install npm@latest and lerna
  # caching feature creates `~/cached-bins` for us, the private:true is to avoid annoying npm warnings about package.json
    cd ~/cached-bins && echo '{"private":true}' > package.json && npm install npm@latest lerna --no-package-lock
    cd -
  } || true
  # avoids bugs around https://github.com/travis-ci/travis-ci/issues/5092
  export PATH=~/cached-bins/node_modules/.bin:$PATH

install: npm run postinstall

cache:
  directories:
    - ~/.npm # cache npm's cache
    - ~/cached-bins # cache latest npm and lerna

jobs:
  include:
    - script: travis_wait 60 npm run coverage
      after_success: npm run coveralls
      env: "COVERAGE=true"

    - &node
      script: npm run test
      node_js: "lts/*"

    - stage: lint
      script: npm run lint

    - stage: precache
      script: true

notifications:
  email: false