extra-dom/lib/previous-sibling.js

Utilities for DOM

import { assert } from '@blackglory/errors';
export function previousSibling(node, distance = 1) {
    assert(Number.isInteger(distance), 'parameter distance must be an integer');
    assert(distance >= 1, 'parameter distance must be greater than or equal to 1');
    return previousSibling(node, distance);
    function previousSibling(node, distance = 1) {
        const currentNode = node.previousSibling;
        if (!currentNode)
            return undefined;
        if (distance === 1) {
            return currentNode;
        }
        else {
            return previousSibling(currentNode, distance - 1);
        }
    }
}
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