I think the root cause of this issue is that prettier does not seem to count ; or !important when counting line widths.

I've scribbled up a set of tests in this playground that check for edge cases around 80 characters.

For instance, both of the following margin declarations are 81 characters long. The first is not reformatted onto two lines, while the second one is correctly reformatted.

.test-81-char-declaration {

  margin: $really-long-variable-name $another-really-long-name $a-third-long-nam;

  margin: $really-long-variable-name $another-really-long-name $a-third-long-name

}

Prettier formats this as:

.test-81-char-declaration {

  margin: $really-long-variable-name $another-really-long-name $a-third-long-nam;

  margin: $really-long-variable-name $another-really-long-name

    $a-third-long-name;

}

Originally posted by @BPScott in #4460