primevue-mirror/components/lib/splitbutton/style/SplitButtonStyle.js

import BaseStyle from 'primevue/base/style';

const classes = {
    root: 'p-splitbutton p-component',
    button: 'p-splitbutton-defaultbutton',
    menuButton: 'p-splitbutton-menubutton'
};

export default BaseStyle.extend({
    name: 'splitbutton',
    classes
});