lint-max-warnings-updater eslint-formatter.js

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  // Adapted from https://eslint.org/docs/latest/extend/custom-formatters

/**
 * @param {import('eslint').ESLint.LintResult[]} results
 * @returns {string}
 */
module.exports = (results) => {
  // accumulate the errors and warnings
  const summary = results.reduce(
    (seq, current) => {
      seq.errors += current.errorCount;
      seq.warnings += current.warningCount;
      return seq;
    },
    {
      errors: 0,
      warnings: 0,
    },
  );

  return summary.errors > 0 || summary.warnings > 0 ? `Errors: ${summary.errors}, Warnings: ${summary.warnings}\n` : '';
};