@mui/base/Button/buttonClasses.js

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

import { generateUtilityClass } from '../generateUtilityClass';
import { generateUtilityClasses } from '../generateUtilityClasses';
const COMPONENT_NAME = 'Button';
export function getButtonUtilityClass(slot) {
  return generateUtilityClass(COMPONENT_NAME, slot);
}
export const buttonClasses = generateUtilityClasses(COMPONENT_NAME, ['root', 'active', 'disabled', 'focusVisible']);