JSON.stringify replacer function for having object keys sorted in output (supports deeply nested objects)

JSON.stringify-replacer-sort-keys.js

// Spec http://www.ecma-international.org/ecma-262/6.0/#sec-json.stringify
const replacer = (key, value) =>
	value instanceof Object && !(value instanceof Array) ? 
		Object.keys(value)
		.sort()
		.reduce((sorted, key) => {
			sorted[key] = value[key];
			return sorted 
		}, {}) :
		value;

// Usage

// JSON.stringify({c: 1, a: { d: 0, c: 1, e: {a: 0, 1: 4}}}, replacer);

It fails to handle the fundamental Object types, converting number, boolean, etc into object...

JSON.stringify({c: new Number(1), a: { d: 0, c: 1, e: {a: 0, 1: 4}}}, replacer,2); '{\n' + ' "a": {\n' + ' "c": 1,\n' + ' "d": 0,\n' + ' "e": {\n' + ' "1": 4,\n' + ' "a": 0\n' + ' }\n' + ' },\n' + ' "c": {}\n' + <<<<===== OOPS! '}'

const replacer = (key, value) => value instanceof Object && !(value instanceof Array) && !(value instanceof Function) && !(value instanceof Date) && !(value instanceof RegExp) && !(value instanceof Boolean) && !(value instanceof Number) && !(value instanceof String) ? Object.keys(value) .sort() .reduce((sorted, key) => { sorted[key] = value[key]; return sorted }, {}) : value;

@bcowgill A nice edge case! What about using this expression
value instanceof Object && !Array.isArray(value) && Object.keys(value).length > 0
to make it more succinct?