// https://github.com/TehShrike/is-mergeable-object/blob/master/index.js

export function isMergeableObject(value: any) {
	return isNonNullObject(value) && !isSpecial(value);
}

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

function isSpecial(value: any) {
	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;
var REACT_ELEMENT_TYPE = canUseSymbol ? Symbol.for('react.element') : 0xeac7;

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