deepmerge.js
No OneTemporary
Actions

Subscribers

None

File Metadata

	import _extends from "@babel/runtime/helpers/esm/extends";
	export function isPlainObject(item) {
	return item !== null && typeof item === 'object' && item.constructor === Object;
	}
	function deepClone(source) {
	if (!isPlainObject(source)) {
	return source;
	}
	const output = {};
	Object.keys(source).forEach(key => {
	output[key] = deepClone(source[key]);
	});
	return output;
	}
	export default function deepmerge(target, source, options = {
	clone: true
	}) {
	const output = options.clone ? _extends({}, target) : target;
	if (isPlainObject(target) && isPlainObject(source)) {
	Object.keys(source).forEach(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;
	}