deepmerge.js
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	import _extends from "@babel/runtime/helpers/esm/extends";
	import _typeof from "@babel/runtime/helpers/esm/typeof";
	export function isPlainObject(item) {
	return item !== null && _typeof(item) === 'object' && item.constructor === Object;
	}
	function deepClone(source) {
	if (!isPlainObject(source)) {
	return source;
	}
	var output = {};
	Object.keys(source).forEach(function (key) {
	output[key] = deepClone(source[key]);
	});
	return output;
	}
	export default function deepmerge(target, source) {
	var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {
	clone: true
	};
	var output = options.clone ? _extends({}, target) : target;
	if (isPlainObject(target) && isPlainObject(source)) {
	Object.keys(source).forEach(function (key) {
	// Avoid prototype pollution
	if (key === '__proto__') {
	return;
	}
	if (isPlainObject(source[key]) && key in target && isPlainObject(target[key])) {
	// Since `output` is a clone of `target` and we have narrowed `target` in this block we can cast to the same type.
	output[key] = deepmerge(target[key], source[key], options);
	} else if (options.clone) {
	output[key] = isPlainObject(source[key]) ? deepClone(source[key]) : source[key];
	} else {
	output[key] = source[key];
	}
	});
	}
	return output;
	}