Warning: Cannot update a component (`Unknown`) while rendering a different component

I saw a React.js post on useEffect and then looked for examples on Gutenberg source as follows:

...
import {
    useEffect
} from '@wordpress/element';
...
function Test2Edit(props) {
    ...
    useEffect( () => {
        setAttributes( { sliderId: clientId } );
    }, [ clientId ] );
    ...

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