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next.js/packages/next/lib/error.js

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import React from 'react'
import PropTypes from 'prop-types'
import HTTPStatus from 'http-status'
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import Head from 'next-server/head'
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export default class Error extends React.Component {
static getInitialProps ({ res, err }) {
const statusCode = res ? res.statusCode : (err ? err.statusCode : null)
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return { statusCode }
}
render () {
const { statusCode } = this.props
const title = statusCode === 404
? 'This page could not be found'
: HTTPStatus[statusCode] || 'An unexpected error has occurred'
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return <div style={styles.error}>
<Head>
<meta name='viewport' content='width=device-width, initial-scale=1.0' />
<title>{statusCode}: {title}</title>
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</Head>
<div>
<style dangerouslySetInnerHTML={{ __html: 'body { margin: 0 }' }} />
{statusCode ? <h1 style={styles.h1}>{statusCode}</h1> : null}
<div style={styles.desc}>
<h2 style={styles.h2}>{title}.</h2>
</div>
</div>
</div>
}
}
if (process.env.NODE_ENV !== 'production') {
Error.propTypes = {
statusCode: PropTypes.number
}
}
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const styles = {
error: {
color: '#000',
background: '#fff',
fontFamily: '-apple-system, BlinkMacSystemFont, Roboto, "Segoe UI", "Fira Sans", Avenir, "Helvetica Neue", "Lucida Grande", sans-serif',
height: '100vh',
textAlign: 'center',
display: 'flex',
flexDirection: 'column',
alignItems: 'center',
justifyContent: 'center'
},
desc: {
display: 'inline-block',
textAlign: 'left',
lineHeight: '49px',
height: '49px',
verticalAlign: 'middle'
},
h1: {
display: 'inline-block',
borderRight: '1px solid rgba(0, 0, 0,.3)',
margin: 0,
marginRight: '20px',
padding: '10px 23px 10px 0',
fontSize: '24px',
fontWeight: 500,
verticalAlign: 'top'
},
h2: {
fontSize: '14px',
fontWeight: 'normal',
lineHeight: 'inherit',
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margin: 0,
padding: 0
}
}