src/language-js/pragma.js/parseDocBlock
function parseDocBlock(text) {
  const shebang = getShebang(text);
  if (shebang) {
    text = text.slice(shebang.length + 1);
  }

  const docBlock = extract(text);
  const { pragmas, comments } = parseWithComments(docBlock);

  return { shebang, text, pragmas, comments };
}