How can I configure TinyMCE to remove the class attribute from all elements?

[tanggd]

How can I configure TinyMCE to remove the class attribute from all elements?

tinymce.init({
    selector: 'textarea',
    '???': '???',
    // eg:
    'remove_classes_all_elements': true,
});

tinymce@6.x

[lostkeys]

Hi @tanggd. Have a look at the valid classes config option.