Function skipWhitespace

scripts/experimental/swiftui-preview.mjs:1087–1092

(source, index)

}

function skipWhitespace(source, index) {
  while (/\s/.test(source[index] ?? "")) {
    index += 1;
  }
  return index;
}

function skipQuoted(source, start) {
  const quote = source[start];