@saiballo/html-validator-enhanced/lib/filter-data.js

A Node module with optional settings for validating HTML pages using the "validator.w3.org/nu" or "whatwg" standard.

module.exports = function (data, ignore) {
	const list = data.split("\n");
	const filters = Array.isArray(ignore) ? ignore : [ignore];
	let errors = false;
	const results = [];
	list.forEach(function (line, index) {
		if (line.startsWith("Error") && filters.indexOf(line) === -1) {
			results.push(line);
			results.push(list[index + 1]);
			errors = true;
		} else if (line.startsWith("The")) {
			results.push(line);
		}
	});
	return errors === true ? results.join("\n") : "The document validates according to the specified schema(s).";
};