MediaWiki:Common.js

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mw.loader.using( 'mediawiki.util', function () {
    if (
        !mw.config.get( 'wgUserGroups' ).includes( 'editor' ) &&
        !mw.config.get( 'wgUserGroups' ).includes( 'approver' ) &&
        !mw.config.get( 'wgUserGroups' ).includes( 'sysop' )
    ) {
        mw.util.addCSS(
            '#ca-edit, #ca-ve-edit, #ca-edit-source { display:none !important; }'
        );
    }
});