text: function getTravisVariables () {
    // values from process.env are always string
    const getEnv = (name) => process.env[name]
  
    return {
      TRAVIS_BUILD_DIR: getEnv('TRAVIS_BUILD_DIR'),
      TRAVIS_TAG: getEnv('TRAVIS_TAG'),
      TRAVIS_COMMIT: getEnv('TRAVIS_COMMIT'),
      TRAVIS_REPO_SLUG: getEnv('TRAVIS_REPO_SLUG'),
      // encrypted variables
      REGISTRY_TOKEN: getEnv('REGISTRY_TOKEN')
    }
  }
  
  module.exports = getTravisVariables
  