jhladmin/node_modules/mdast-util-to-markdown/lib/util/check-emphasis.js

module.exports = checkEmphasis

function checkEmphasis(context) {
  var marker = context.options.emphasis || '*'

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

  return marker
}