Strange linebreak with long arguments and callbacks

When a function call has a callback but also has many and/or long arguments, for specific lengths the callback formatting is quite strange.

Input:

someFunctionCallWithBigArgumentsAndACallback(thisArgumentIsQuiteLong, function(cool) {
  return cool
})

Actual Output (strange line break in function):

someFunctionCallWithBigArgumentsAndACallback(thisArgumentIsQuiteLong, function(
  cool
) {
  return cool;
});

Expected Output:

someFunctionCallWithBigArgumentsAndACallback(
  thisArgumentIsQuiteLong,
  function(cool) {
    return cool;
  }
);

Note that if thisArgumentIsQuiteLong is a little bit longer, or you add more parameters, the expected output formatting happens. It’s only for specific lengths that this strange formatting appears.

[suchipi]

Do we have snapshots for these cases? If not, we should add them, so that we don’t introduce an unintentional regression later (considering the cause of the fix is unknown)

[thorn0]

Fixed by https://github.com/prettier/prettier/pull/9662 Let’s add a test from this issue and close it.