import {Controlled as CodeMirror} from 'react-codemirror2';

const [instance, setInstance] = useState(null);
<CodeMirror
editorDidMount={editor => setInstance(editor)}
value={'select * from tablea'}
options={{
mode: 'text/sql',
foldGutter: true,
gutters: [
'CodeMirror-linenumbers',
'CodeMirror-foldgutter',
'CodeMirror-lint-markers',
],
}}
/>