using the for loop paradigm to drill down to a matching shadowRoot

mandrill.js

function updateState (state) {
	return console.dir(state);
}

const thaNode = {};

const host = {
	shadowRoot: thaNode
};

const detail = {
	host: {
		parentNode: {
			parentNode: thaNode
		}
	},
	action: {
		payload: {
			error: new Error('danger bill roberson')
		}
	}
};

for (
	let currentElement = detail.host;
	currentElement;
	currentElement = currentElement.parentNode
) {
	if (currentElement === host.shadowRoot) 
		updateState({error: detail.action.payload.error});
}