replaceEmptyStringsByNull.js

import cloneDeep from 'lodash/cloneDeep';

const replaceNull = (value) => (value === '') ? null : value;

const proxyHandler = {
	get(target, key, receiver) {
		const value = Reflect.get(target, key, receiver);
		const nullifiedValue = replaceNull(value);

		if (typeof nullifiedValue === 'object' && nullifiedValue !== null) {
			return new Proxy(nullifiedValue, proxyHandler);
		}

		return nullifiedValue;
	},
};

const replaceEmptyStringsByNull = (initialObject) => {
	const proxy = new Proxy(initialObject, proxyHandler);

	return cloneDeep(proxy);
};

export default replaceEmptyStringsByNull;