Format the output of ESLint to group by rule-id

eslint-formatter-by-ruleid

// breakdown by type (ruleId)
module.exports = function (results) {
  const processed = results
    .filter((result) => result.messages.length > 0)
    .map((result) => result.messages.map((item) => item.ruleId))
    .flat();

  const filtered = processed.reduce((acc, val) => {
    acc[val] = acc[val] === undefined ? 1 : (acc[val] += 1);
    return acc;
  }, {});
  console.log(filtered);
  return processed;
};