vue-react-dnd/src/areOptionsEqual.js

Vue Drag and Drop Library based on react-dnd

let shallowEqual = function (objA, objB) {
  if (objA === objB) {
    return true
  }

  const keysA = Object.keys(objA)
  const keysB = Object.keys(objB)

  if (keysA.length !== keysB.length) {
    return false
  }

  // Test for A's keys different from B.
  const hasOwn = Object.prototype.hasOwnProperty
  for (let i = 0; i < keysA.length; i += 1) {
    if (!hasOwn.call(objB, keysA[i]) || objA[keysA[i]] !== objB[keysA[i]]) {
      return false
    }

    const valA = objA[keysA[i]]
    const valB = objB[keysA[i]]

    if (valA !== valB) {
      return false
    }
  }

  return true
}

export default function areOptionsEqual (nextOptions, currentOptions) {
  if (currentOptions === nextOptions) {
    return true
  }

  return (
    currentOptions !== null &&
            nextOptions !== null &&
            shallowEqual(currentOptions, nextOptions)
  )
}