Detect language

lang.js

const LanguageDetect = require('languagedetect');
const lngDetector = new LanguageDetect();
const AlgoliaIndexTransform = require('algolia-index-transform');
const algoliaIndexTransform = new AlgoliaIndexTransform({
  sourceApplicationID: 'source_app_id',
  sourceApiKey: 'source_key_here',
  sourceIndexName: 'site-search',
  destinationApplicationID: 'dest_app_id',
  destinationApiKey: 'dest_key_here',
  destinationIndexName: 'site-search',
});

algoliaIndexTransform.map(item => {
  if (item.type !== 'PDF') {
    return {
      ...item,
    };
  }
  if (!item.content.length) {
    return {
      ...item,
    };
  }
  const lang = lngDetector.detect(item.content);
  if (!lang || !lang.length) {
    return {
      ...item,
    };
  }
  return {
    ...item,
    country: lang[0][0] === 'french' ? 'fr' : 'other',
    language: lang[0][0] === 'french' ? 'fr' : 'other',
  };
});