code: function refresh (env) {
      return safeWipe(env.dest, {
        force: true,
        parent: is.string(env.src) || is.array(env.src) ? g2b(env.src) : null,
        silent: true,
      })
        .then(() => mkdir(env.dest))
        .then(() => {
          env.logger.log(`Folder \`${env.displayDest}\` successfully refreshed.`)
        })
        .catch(err => {
          // Friendly error for already existing directory.
          throw new errors.SassDocError(err.message)
        })
    }
docs: Safely wipe and re-create the destination directory.
  @return {Promise}