yargs/lib/obj-filter.js

'use strict'
module.exports = function objFilter (original, filter) {
  const obj = {}
  filter = filter || ((k, v) => true)
  Object.keys(original || {}).forEach((key) => {
    if (filter(key, original[key])) {
      obj[key] = original[key]
    }
  })
  return obj
}