code: function generateISO_639_1() {
    return fs.ensureDirAsync(OUTPUT_DIR)
      .then(logger('Ensured output directory exists.'))
      .then(() => scrapeUtil.scrapePages(configs))
      .then(({ wiki }) => {
        return wiki.iso_639_1;
      })
      .then(scrapeUtil.renderFiles(FORMATS, FILE_PREFIX, OUTPUT_DIR))
      .then(logger('Rendered output files.'))
      .catch(err => console.error(err));
  }
docs: eslint-disable-next-line camelcase