get a diff from 2 objects(Recursively)

object-diff.ts

function objectDiff (object, newObject, exclude) {
  const result = {}

  if (!exclude)	{
    exclude = []
  }

  for (const prop in newObject) {
    if (newObject.hasOwnProperty(prop) && prop != '__proto__' && exclude.indexOf(newObject[prop]) == -1) {
      if (
        // consider a diff if object didn't have the prop
        !object.hasOwnProperty(prop) ||
        // consider a diff if array didn't match between object and updated one
        (object[prop].length !== newObject[prop].length && typeof newObject[prop] === 'object')
      ) {
        result[prop] = newObject[prop]
      } else if (newObject[prop] === Object(newObject[prop])) {
        const difference = objectDiff(newObject[prop], object[prop])
        if (Object.keys(difference).length > 0) result[prop] = difference
      } else if (newObject[prop] !== object[prop]) {
        if (newObject[prop] === undefined) {
          result[prop] = 'undefined'
        }

        if (newObject[prop] === null) {
          result[prop] = undefined
        } else if (typeof newObject[prop] === 'function') {
          result[prop] = 'function'
        } else if (typeof newObject[prop] === 'object') {
          result[prop] = 'object'
        } else {
          result[prop] = newObject[prop]
        }
      }
    }
  }

  return result
}