src/language-handlebars/printer-glimmer.js/printProgram
function printProgram(path, print, options) {
  const node = path.getValue();

  if (blockStatementHasOnlyWhitespaceInProgram(node)) {
    return "";
  }

  const program = print("program");

  if (options.htmlWhitespaceSensitivity === "ignore") {
    return indent([hardline, program]);
  }

  return indent(program);
}