src/language-js/print/module.js/shouldNotPrintSpecifiers
function shouldNotPrintSpecifiers(node, options) {
  const { type, importKind, source, specifiers } = node;

  if (
    type !== "ImportDeclaration" ||
    (Array.isArray(specifiers) && specifiers.length > 0) ||
    importKind === "type"
  ) {
    return false;
  }

  // TODO: check tokens
  return !/{\s*}/.test(
    options.originalText.slice(locStart(node), locStart(source))
  );
}