react-mapfilter/scripts/build-translations.js

#!/usr/bin/env node

const glob = require('glob')
const util = require('util')
const mkdirp = require('mkdirp')
const rimraf = require('rimraf')
const path = require('path')
const fs = require('fs')
const murmurHash = require('babel-plugin-react-intl-id-hash/lib/murmurHash')
  .default

const readFile = util.promisify(fs.readFile)
const writeFile = util.promisify(fs.writeFile)
const mkdirpPromise = util.promisify(mkdirp)

async function readJson(file) {
  return JSON.parse(await readFile(file))
}

async function writeJson(file, data) {
  await mkdirpPromise(path.dirname(file))
  await writeFile(file, JSON.stringify(data, null, 2))
}

rimraf.sync('translations/*')

// "shared" strings are included in translations for all components
glob('messages/**/*.json', async function(er, files) {
  const allMsgs = {}
  for (const file of files) {
    const lang = path.basename(file)
    const msgs = await readJson(file)
    if (!allMsgs[lang]) allMsgs[lang] = msgs
    else allMsgs[lang] = { ...allMsgs[lang], ...msgs }
  }
  for (const lang in allMsgs) {
    const translations = {}
    const msgs = allMsgs[lang]
    Object.keys(msgs).forEach(key => {
      // For production message ids are hashed, so we need to hash the ids of
      // translations too
      const hashedKey = murmurHash(key)
      translations[hashedKey] = msgs[key].message
    })
    const output = path.join(__dirname, '../translations', lang)
    await writeJson(output, translations)
  }
})