If I call:

jss.set('.myClass', {
'display': 'none'
});

the css is updated properly , and the display elements are updated as expected.

However, calling

jss.remove('.myClass');

has no effect.

Calling

jss.remove();

works though.

The .myClass style is not defined anywhere. If I do define it in a .css file included on the page, the behaviour is the same. If I use an element type selector instead of a class selector, remove seems to work as would be expected.