react-material-overlay/src/utils/mergeClasses.ts

A fully featured Material UI implementation of overlays like modals, alert dialogs, lightboxes, and bottom sheets featuring easy stack management and browser history integration

export default function mergeClasses<T extends object>(obj1: T, obj2: T): T {
	const merged: any = {};

	for (const key in obj1) {
		if (key in obj1) {
			merged[key] = obj1[key];
		}
	}

	for (const key in obj2) {
		if (key in obj2) {
			merged[key] = merged[key] ? `${merged[key]} ${obj2[key]}` : obj2[key];
		}
	}

	return merged as T;
}