/**
 * Gets executed after all workers got shut down and the process is about to exit. An error
 * thrown in the onComplete hook will result in the test run failing.
 * @param {Object} exitCode 0 - success, 1 - fail
 * @param {Object} config wdio configuration object
 * @param {Array.<Object>} capabilities list of capabilities details
 * @param {<Object>} results object containing test results
 */
export default function (exitCode: any, config: any, capabilities: any, results: any): Promise<void>;