index.js

const parser = require('postcss-selector-parser');

const anyAnyLinkMatch = /:any-link/;

/**
 * @param {{preserve?: boolean}} opts
 * @returns {import('postcss').Plugin}
 */
module.exports = function creator(opts) {
	const preserve = 'preserve' in Object(opts) ? Boolean(opts.preserve) : true;

	return {
		postcssPlugin: 'postcss-pseudo-class-any-link',
		Rule(rule) {
			if (!anyAnyLinkMatch.test(rule.selector)) {
				return;
			}

			const rawSelector = rule.raws.selector && rule.raws.selector.raw || rule.selector;

			// workaround for https://github.com/postcss/postcss-selector-parser/issues/28#issuecomment-171910556
			if (rawSelector[rawSelector.length - 1] !== ':') {
				// update the selector
				const updatedSelector = parser(selectors => {
					// cache variables
					let node;
					let nodeIndex;
					let selector;
					let selectorLink;
					let selectorVisited;

					// cache the selector index
					let selectorIndex = -1;

					// for each selector
					while (selector = selectors.nodes[++selectorIndex]) {
						// reset the node index
						nodeIndex = -1;

						// for each node
						while (node = selector.nodes[++nodeIndex]) {
							// if the node value matches the any-link value
							if (node.value === ':any-link') {
								// clone the selector
								selectorLink = selector.clone();
								selectorVisited = selector.clone();

								// update the matching clone values
								selectorLink.nodes[nodeIndex].value = ':link';
								selectorVisited.nodes[nodeIndex].value = ':visited';

								// replace the selector with the clones and roll back the selector index
								selectors.nodes.splice(selectorIndex--, 1, selectorLink, selectorVisited);

								// stop updating the selector
								break;
							}
						}
					}
				}).processSync(rawSelector);

				if (updatedSelector !== rawSelector) {
					if (preserve) {
						rule.cloneBefore({
							selector: updatedSelector
						});
					} else {
						rule.selector = updatedSelector;
					}
				}
			}
		}
	}
}

module.exports.postcss = true;