src/cli/util.js/createIgnorerFromContextOrDie
function createIgnorerFromContextOrDie(context) {
  try {
    return createIgnorer.sync(
      context.argv["ignore-path"],
      context.argv["with-node-modules"]
    );
  } catch (e) {
    context.logger.error(e.message);
    process.exit(2);
  }
}