/**
 * @typedef {import('../types.js').Context} Context
 * @typedef {import('../types.js').Options} Options
 */

/**
 * @param {Context} context
 * @returns {Exclude<Options['rule'], undefined>}
 */
export function checkRule(context) {
  const marker = context.options.rule || '*'

  if (marker !== '*' && marker !== '-' && marker !== '_') {
    throw new Error(
      'Cannot serialize rules with `' +
        marker +
        '` for `options.rule`, expected `*`, `-`, or `_`'
    )
  }

  return marker
}