cross-ci/lib/envCi.d.ts

`cross-ci` standardizes environment variables for CI. For example, your can simply use `BUILD_BRANCH` variable in all CI runners instead of `CIRCLE_BRANCH` in CircleCI or `TRAVIS_PULL_REQUEST_BRANCH` in Travis.

import envCi = require('env-ci');
declare const _default: envCi.CiEnv;
export = _default;