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# Ensure JSX className adheres to CSS namespace guidelines
If JSX element includes `className`, it must follow the [Block-Element-Modifier](https://en.bem.info/methodology/naming-convention/) naming principle.
## Rule Details
The following patterns are considered warnings:
```jsx
// client/sample-component/index.js
export function myComponent1() {
return <div className="sampleVisibleDiv" />;
}
// client/another-sample/index.js
export function myComponent2() {
return (
<div className="another-sample">
<div className="another-sample-child" />
</div>
);
}
```
The following patterns are not warnings:
```jsx
// client/sample-component/index.js
export function myComponent1() {
return <div className="sample__visible" />;
}
// client/another-sample/index.js
export function myComponent2() {
return (
<div className="another-sample">
<div className="another-sample__child" />
</div>
);
}
```
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