fill-keys/index.js

Fill keys in a destination that are defined on the source

'use strict'

const mergeDescriptors = require('merge-descriptors')
const isObject = require('is-object')

function fill (destination, source, merge) {
  if (destination && (isObject(source) || isFunction(source))) {
    merge(destination, source, false)
    if (isFunction(destination) && isFunction(source) && source.prototype) {
      merge(destination.prototype, source.prototype, false)
    }
  }
  return destination
}

module.exports = function fillKeys (destination, source) {
  return fill(destination, source, mergeDescriptors)
}

function isFunction (value) {
  return typeof value === 'function'
}