Sort YAML keys using Node.js

sort.js

const fs = require('fs')
const yaml = require('js-yaml')

const transform = ({target, source, options}) => {
  fs.readFile(source, 'utf8', function(err, data) {
    if (err) throw err

    data = yaml.safeLoad(data)
    data = yaml.safeDump(data, options)

    fs.writeFile(target, data, function(err) {
      if (err) throw err
    })
  })
}

transform({
  source: 'source.yml',
  target: 'target.yml',
  options: {
    sortKeys: true,
    lineWidth: 1000
  }
})

verify.js

const fs = require('fs')
const yaml = require('js-yaml')
const traverse = require('traverse')
const equal = require('deep-equal')

const verify = ({target, source}) => {
  source = traverse(yaml.safeLoad(fs.readFileSync(source, 'utf8')))
  target = traverse(yaml.safeLoad(fs.readFileSync(target, 'utf8')))

  const measure = function(a, b) {
    if (a.length !== b.length) console.error('Length mismatch:', a.length, b.length)
  }

  const is = function(p) {
    const diff = !equal(source.get(p), target.get(p))
    if (diff) console.error('Value mismatch for path', JSON.stringify(p))
    return !diff
  }

  const report = function(array) {
    if (array.every(is)) console.log(array.length, 'verified')
  }

  measure(source.paths(), target.paths())
  report(source.paths().sort().reverse())
  report(target.paths().sort().reverse())
}

verify({
  source: 'source.yml',
  target: 'target.yml',
})

Uses js-yaml, traverse, deep-equal and Node filesystem.