javascript - Uglify css classname like instagram or facebook -

how can uglifiy css files on instagram or facebook?

e.g _8f735, _oofbn, _6ltyr it's react plugins or something? saw on instagram , facebook.

have @ css modules.

example react css modules:

in context of react, css modules this:

import react 'react'; import styles './table.css';  export default class table extends react.component {     render () {         return <div classname={styles.table}>             <div classname={styles.row}>                 <div classname={styles.cell}>a0</div>                 <div classname={styles.cell}>b0</div>             </div>         </div>;     } } 

rendering component produce markup similar to:

<div class="table__table___32osj">     <div class="table__row___2w27n">         <div class="table__cell___2w27n">a0</div>         <div class="table__cell___1ovw5">b0</div>     </div> </div> 

and corresponding css file matches css classes.

important: class names can have different format.