Warning: UnControlled.shouldComponentUpdate(): Returned undefined instead of a boolean value. Make sure to return true or false.

[linkenneth]

I'm running unit tests with Jest and ran across a billion warnings like this:

    console.error node_modules/fbjs/lib/warning.js:33
      Warning: UnControlled.shouldComponentUpdate(): Returned undefined instead of a boolean value. Make sure to return true or false.

Any ideas? My usage of react-codemirror2:

import { UnControlled as CodeMirror } from 'react-codemirror2';
import 'codemirror/mode/javascript/javascript';

import 'codemirror/lib/codemirror.css';
import 'codemirror/theme/material.css';

// ...

render() {
    const { code, ...otherProps } = this.props;
    return (
      <div className={cx(this.props.className, styles.main)}>
        <CodeMirror
          editorDidMount={(editor) => this.editor = editor}
          onChange={this.handleChange}
          value={this.state.code}
          {...otherProps}
        />
      </div>
    );
}

Looking at the source code it seems like it should always be returning true or false though. My versions:

package.json:
    "react-codemirror2": "^5.1.0",

package-lock.json
    "react-codemirror2": {
      "version": "5.1.0",
      "resolved": "https://registry.npmjs.org/react-codemirror2/-/react-codemirror2-5.1.0.tgz",
      "integrity": "stuff"
    },

[scniro]

@linkenneth you can see what's returned here - it's always true or false. I don't see any warnings at all with the tests. I'm guessing this is specific to your usage in your app. Going to close this out soon unless the issue is directly related to the lib itself

[linkenneth]

Yes I've seen that too which is why this is so confusing. Thanks! I'll investigate further on my own.