How to use the prettier.hasNewline function in prettier

function printTrailingComment(commentPath, print, options) {
  const comment = commentPath.getValue();
  const contents = printComment(commentPath, options);
  if (!contents) {
    return "";
  }
  const isBlock =
    options.printer.isBlockComment && options.printer.isBlockComment(comment);

  if (
    hasNewline(options.originalText, options.locStart(comment), {
      backwards: true,
    })
  ) {
    // This allows comments at the end of nested structures:
    // {
    //   x: 1,
    //   y: 2
    //   // A comment
    // }
    // Those kinds of comments are almost always leading comments, but
    // here it doesn't go "outside" the block and turns it into a
    // trailing comment for `2`. We can simulate the above by checking
    // if this a comment on its own line; normal trailing comments are
    // always at the end of another expression.

    const isLineBeforeEmpty = isPreviousLineEmpty(

const comment = commentPath.getValue();
  const contents = printComment(commentPath, options);

  if (!contents) {
    return "";
  }

  const isBlock =
    options.printer.isBlockComment && options.printer.isBlockComment(comment);

  // Leading block comments should see if they need to stay on the
  // same line or not.
  if (isBlock) {
    return concat([
      contents,
      hasNewline(options.originalText, options.locEnd(comment))
        ? hardline
        : " ",
    ]);
  }

  return concat([contents, hardline]);
}

path.each((commentPath) => {
    const comment = commentPath.getValue();
    const { leading, trailing } = comment;

    if (leading) {
      const contents = printLeadingComment(commentPath, print, options);
      if (!contents) {
        return;
      }
      leadingParts.push(contents);

      const text = options.originalText;
      if (hasNewline(text, skipNewline(text, options.locEnd(comment)))) {
        leadingParts.push(hardline);
      }
    } else if (trailing) {
      trailingParts.push(printTrailingComment(commentPath, print, options));
    }
  }, "comments");

function isStringOnItsOwnLine(node, text, options) {
  return (
    (node.kind === "string" ||
      (node.kind === "encapsed" &&
        (node.type === "string" || node.type === "shell"))) &&
    stringHasNewLines(node) &&
    !hasNewline(text, options.locStart(node), { backwards: true })
  );
}

      (comment) => comment.leading && hasNewline(text, options.locEnd(comment))
    )

function isNextLineEmptyAfterNamespace(text, node, locStart) {
  let idx = locStart(node);
  idx = skipEverythingButNewLine(text, idx);
  idx = skipNewline(text, idx);
  return hasNewline(text, idx);
}