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next.js/examples/with-higher-order-component/hocs/withUserAgent.js

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import { getDisplayName } from '../lib/getDisplayName'
export const withUserAgent = Page => {
const WithUserAgent = props => <Page {...props} />
WithUserAgent.getInitialProps = async context => {
const userAgent = context.req
? context.req.headers['user-agent']
: navigator.userAgent
return {
...(Page.getInitialProps ? await Page.getInitialProps(context) : {}),
userAgent
}
}
WithUserAgent.displayName = `WithUserAgent(${getDisplayName(Page)})`
return WithUserAgent
}