promiseAllRecursive.js

function promiseAllRecursive(value) {

	if (value instanceof Promise) {
		return value;
	}

	if (value instanceof Array) {
		return Promise.all(value.map(promiseAllRecursive));
	}

	if (typeof value === 'object' && value !== null) {
		return resolveObject(value);
	}

	return value;
}

function resolveObject(object) {
	const promises = Object.keys(object).map(key => {
		
		const mixed = promiseAllRecursive(object[key]);
		if(!(mixed instanceof Promise)){
			return new Promise((resolve)=>{
				resolve({ key, value: mixed });
			});
		}
		else{
			return mixed.then(value => ({ key, value }));
		}
		
	});

	return Promise.all(promises).then(results => {
		return results.reduce((obj, pair) => {
			obj[pair.key] = pair.value;
			return obj;
		}, {});
	});
}

export default promiseAllRecursive;