Function concatSelectors

src/utils.ts:202–229

(
    parentSelectors: string[],
    nodeSelectors: string[],
)

const PostcssInst = postcss([]);

const concatSelectors = (
    parentSelectors: string[],
    nodeSelectors: string[],
): string[] => {
    // if parent is AtRule
    if (parentSelectors.length === 0) return nodeSelectors;

    return ([] as string[]).concat(
        ...parentSelectors.map(ps =>
            nodeSelectors.map(
                /**
                 * No need to replace for children separated by spaces
                 *
                 * .parent {
                 *      color: red;
                 *
                 *      & .child {
                 *      ^^^^^^^^ no need to do the replace here,
                 *               since no new classnames are created
                 *          color: pink;
                 *      }
                 * }
                 */
                s => (/&[a-z0-1-_]/i.test(s) ? s.replace('&', ps) : s),
            ),
        ),
    );
};

function getParentRule(node: Node): undefined | Node {
    const {parent} = node;