/**
 * Logger.
 *
 * @example
 *     add = logger()
 *
 *     log = add({ name: 'rimraf', rawSpec: 'rimraf@2.5.1' })
 *     log('resolved', pkgData)
 *     log('downloading')
 *     log('downloading', { done: 1, total: 200 })
 *     log('depnedencies')
 *     log('error', err)
 */
export default function (): void;
