prettier/tests/preserve_line/comments.js

function a() {
  const a = 5; // comment

  return a;
}

function a() {
  const a = 5; /* comment */

  return a;
}

function a() {
  const a = 5; /* comment */ /* comment */

  return a;
}

function a() {
  const a = 5; /* comment */ /* comment */ // comment
  return a;
}

function a() {
  const a = 5; /* comment */ /* comment */ // comment

  return a;
}