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next.js/examples/with-portals/components/Portal.js

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import React from 'react'
import ReactDOM from 'react-dom'
export class Portal extends React.Component {
componentDidMount () {
this.element = document.querySelector(this.props.selector)
}
render () {
if (this.element === undefined) {
return null
}
return ReactDOM.createPortal(this.props.children, this.element)
}
}