Replace ReactDOM.findDOMNode() with ref. #71
Merged
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Replaced findDOMNode with refs which is a more explicit and preferred method of accessing underlying DOM nodes. See:
https://reactjs.org/docs/react-dom.html#finddomnode
https://reactjs.org/docs/strict-mode.html#warning-about-deprecated-finddomnode-usage
jsx-eslint/eslint-plugin-react#678
Incidentally, this also resolves issue #70 where the "Unable to find node on an unmounted component" exception is thrown possibly due to different libraries using different versions of react-dom in the same project.