renameProps.js

const fs = require('fs')
const dir = require('node-dir')

const { GIT_HOME } = process.env
const SOURCE_DIR = `${GIT_HOME}/layers-config/layer-metadata/v1.0/`

const renameKeys = {
  period: 'layerPeriod'
}

const errCallback = (err) => {
  if (err) {
    console.log(err)
    throw err
  }
}

function processConfig (filePath) {
  const pathStrings = filePath.split('/')
  const fileName = pathStrings[pathStrings.length - 1]
  if (!fileName.includes('.json')) {
    return
  }
  const metadataJson = JSON.parse(fs.readFileSync(filePath, 'utf-8'))
  Object.keys(renameKeys).forEach((key) => {
    const entry = metadataJson
    const newKey = renameKeys[key]
    entry[newKey] = entry[key]
    delete entry[key]
  })
  fs.writeFile(`${filePath}`, JSON.stringify(metadataJson, null, 2), errCallback)
}

dir.files(SOURCE_DIR, (err, files) => {
  if (err) throw err
  files.forEach(processConfig)
})