druid/node_modules/mdast-util-to-markdown/lib/util/check-rule-repeat.js

module.exports = checkRule

function checkRule(context) {
  var repetition = context.options.ruleRepetition || 3

  if (repetition < 3) {
    throw new Error(
      'Cannot serialize rules with repetition `' +
        repetition +
        '` for `options.ruleRepetition`, expected `3` or more'
    )
  }

  return repetition
}