#!/usr/bin/env node

/** Returns true if current environment is running inside CI. Otherwise returns false. */
function insideCi() {
  // Bail out if this is specifically overwritten to false.
  // Some users seem to wanna be able to do that
  if (process.env.CI === 'false') return false

  // Most CI use env.CI (travis, Gitlab, etc.)
  // There are some exceptions though:
  // CI_APP_ID is used by Appflow: https://ionic.io/docs/appflow/package/environments#predefined-environments
  // CI_NAME is used by Codeship:https://docs.cloudbees.com/docs/cloudbees-codeship/latest/pro-builds-and-configuration/environment-variables
  // BUILD_NUMBER is used by TeamCity: https://www.jetbrains.com/help/teamcity/predefined-build-parameters.html#Predefined+Server+Build+Parameters
  // RUN_ID is used by Taskcluster: https://docs.taskcluster.net/docs/reference/workers/docker-worker/environment
  return Boolean(['CI','CI_APP_ID','BUILD_NUMBER','CI_NAME','RUN_ID'].some(x => process.env[x]))
}

module.exports.insideCi = insideCi

if (require.main === module) {
  process.exit(insideCi() ? 0 : 1)
}