translate.js

const AWS = require('aws-sdk');
const BP = require('bluebird');
const fs = require('fs');
const util = require('util');
const mkdirp = require('mkdirp');
const getDirName = require('path').dirname;
const {languages, defaultLanguage} = require('./languages');

const readFile = util.promisify(fs.readFile);
const readdir = util.promisify(fs.readdir);
const writeFile = util.promisify(fs.writeFile);

const write = async (path, content) => {
  await mkdirp(getDirName(path));
  return writeFile(path, JSON.stringify(content, null, 2), 'utf8');
};

AWS.config.region = process.env.REGION || 'us-east-1';
const translate = new AWS.Translate();

async function main() {
  const files = await readdir(`locales/${defaultLanguage}`);
  await BP.map(files, async (filename) => {
    const data = await readFile(`locales/${defaultLanguage}/${filename}`, 'utf8');
    const translations = JSON.parse(data);

    const resultMap = {};
    await BP.map(
      languages,
      async (lng) => {
        if (lng === defaultLanguage) return;
        try {
          const localeData = await readFile(`locales/${lng}/${filename}`, 'utf8');
          resultMap[lng] = JSON.parse(localeData);
        } catch (error) {
          resultMap[lng] = {};
        }
        await BP.map(
          Object.keys(translations),
          async (key) => {
            if (key === '_t' || resultMap[lng][key]) return;
            const {TranslatedText} = await translate
              .translateText({
                Text: translations[key],
                SourceLanguageCode: defaultLanguage,
                TargetLanguageCode: lng
              })
              .promise();
            resultMap[lng][key] = TranslatedText;
          },
          {concurrency: 10}
        );
        console.log(`Translated: ${lng}`);
      },
      {concurrency: 10}
    );

    BP.map(Object.keys(resultMap), async (lng) => {
      return write(`locales/${lng}/${filename}`, resultMap[lng]);
    });
  });

  console.log('All done!');
}

main();