simred/src/deep/ismergeable.js

A simple redux-like application state manager

// From https://github.com/TehShrike/is-mergeable-object
export default function isMergeableObject(value) {
  return isNonNullObject(value) &&
    !isSpecial(value)
}

function isNonNullObject(value) {
  return !!value && typeof value === 'object'
}

function isSpecial(value) {
  var stringValue = Object.prototype.toString.call(value)

  return stringValue === '[object RegExp]' ||
    stringValue === '[object Date]' ||
    isReactElement(value)
}

// see https://github.com/facebook/react/blob/b5ac963fb791d1298e7f396236383bc955f916c1/src/isomorphic/classic/element/ReactElement.js#L21-L25
var canUseSymbol = typeof Symbol === 'function' && Symbol.for
/* istanbul ignore next */
var REACT_ELEMENT_TYPE = canUseSymbol ? Symbol.for('react.element') : 0xeac7

function isReactElement(value) {
  return value.$$typeof === REACT_ELEMENT_TYPE
}