@wordpress/block-library/src/navigation/edit/utils.js

Block library for the WordPress editor.

function getComputedStyle( node ) {
	return node.ownerDocument.defaultView.getComputedStyle( node );
}

export function detectColors(
	colorsDetectionElement,
	setColor,
	setBackground
) {
	if ( ! colorsDetectionElement ) {
		return;
	}
	setColor( getComputedStyle( colorsDetectionElement ).color );

	let backgroundColorNode = colorsDetectionElement;
	let backgroundColor =
		getComputedStyle( backgroundColorNode ).backgroundColor;
	while (
		backgroundColor === 'rgba(0, 0, 0, 0)' &&
		backgroundColorNode.parentNode &&
		backgroundColorNode.parentNode.nodeType ===
			backgroundColorNode.parentNode.ELEMENT_NODE
	) {
		backgroundColorNode = backgroundColorNode.parentNode;
		backgroundColor =
			getComputedStyle( backgroundColorNode ).backgroundColor;
	}

	setBackground( backgroundColor );
}