How to use the babel-core.util.arrayify function in babel-core

function shouldIgnoreBabelrc(filename, babelrc) {
  // Determine if we should ignore this babelrc file. We do this here instead of
  // letting babel-core handle it because this config might be merged with our
  // autogenerated one later which shouldn't be ignored.
  let ignore = babelUtils.arrayify(babelrc.ignore, babelUtils.regexify);
  let only =
    babelrc.only && babelUtils.arrayify(babelrc.only, babelUtils.regexify);
  return babelUtils.shouldIgnore(filename, ignore, only);
}

process.exit(2);
}

var opts = exports.opts = {};

(0, _keys2.default)(options).forEach(function (key) {
  var opt = options[key];
  if (commander[key] !== undefined && commander[key] !== opt.default) {
    opts[key] = commander[key];
  }
});

opts.ignore = util.arrayify(opts.ignore, util.regexify);

if (opts.only) {
  opts.only = util.arrayify(opts.only, util.regexify);
}

var fn = void 0;

if (commander.outDir) {
  fn = require("./dir");
} else {
  fn = require("./file");
}

fn(commander, filenames, exports.opts);

console.log();
  };

  outKeys("Transformers", transform.pipeline.transformers);
  outKeys("Module formatters", moduleFormatters);
});

var pkg = require("../../package.json");
commander.version(pkg.version);
commander.usage("[options] ");
commander.parse(process.argv);

//

if (commander.extensions) {
  commander.extensions = util.arrayify(commander.extensions);
}

//

var errors = [];

var filenames = commander.args.reduce(function (globbed, input) {
  var files = glob.sync(input);
  if (!files.length) files = [input];
  return globbed.concat(files);
}, []);

filenames = uniq(filenames);

each(filenames, function (filename) {
  if (!pathExists.sync(filename)) {

commander.option("-x, --extensions [extensions]", "List of extensions to compile when a directory has been input [.es6,.js,.es,.jsx]");
commander.option("-w, --watch", "Recompile files on changes");
commander.option("--skip-initial-build", "Do not compile files before watching");
commander.option("-o, --out-file [out]", "Compile all input files into a single file");
commander.option("-d, --out-dir [out]", "Compile an input directory of modules into an output directory");
commander.option("-D, --copy-files", "When compiling a directory copy over non-compilable files");
commander.option("-q, --quiet", "Don't log anything");


var pkg = require("../../package.json");
commander.version(pkg.version + " (babel-core " + require("babel-core").version + ")");
commander.usage("[options] ");
commander.parse(process.argv);

if (commander.extensions) {
  commander.extensions = util.arrayify(commander.extensions);
}

var errors = [];

var filenames = commander.args.reduce(function (globbed, input) {
  var files = glob.sync(input);
  if (!files.length) files = [input];
  return globbed.concat(files);
}, []);

filenames = uniq(filenames);

filenames.forEach(function (filename) {
  if (!fs.existsSync(filename)) {
    errors.push(filename + " doesn't exist");
  }

export default function (opts?: Object = {}) {
  if (opts.only != null) only = util.arrayify(opts.only, util.regexify);
  if (opts.ignore != null) ignore = util.arrayify(opts.ignore, util.regexify);

  if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));

  if (opts.cache === false) cache = null;

  delete opts.extensions;
  delete opts.ignore;
  delete opts.cache;
  delete opts.only;

  extend(transformOpts, opts);
}

export default function (opts?: Object = {}) {
  if (opts.only != null) only = util.arrayify(opts.only, util.regexify);
  if (opts.ignore != null) ignore = util.arrayify(opts.ignore, util.regexify);

  if (opts.extensions) hookExtensions(util.arrayify(opts.extensions));

  if (opts.cache === false) cache = null;

  delete opts.extensions;
  delete opts.ignore;
  delete opts.cache;
  delete opts.only;

  extend(transformOpts, opts);
}