回答編集履歴
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追記
test
CHANGED
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@@ -31,3 +31,43 @@
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上のように `classes` を与えていないためです。
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# 回避策
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## [defaultProps](https://reactjs.org/docs/typechecking-with-proptypes.html#default-prop-values)
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```
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export default class MyButton extends React.Component {
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static defaultProps = {
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classes: {},
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};
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...
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}
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// or
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MyButton.defaultProps = {
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classes: {},
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}
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```
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