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next.js/lib/error-debug.js

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import React from 'react'
import ansiHTML from 'ansi-html'
import Head from './head'
import {applySourcemaps} from '../client/source-map-support'
// On the client side the error can come from multiple places for example react-hot-loader or client/index.js
// `componentDidCatch` doesn't support asynchronous execution, so we have to handle sourcemap support here
export class ClientDebug extends React.Component {
state = {
mappedError: null
}
componentDidMount () {
const {error} = this.props
// If sourcemaps were already applied there is no need to set the state
if (error.sourceMapsApplied) {
return
}
// Since componentDidMount doesn't handle errors we use then/catch here
applySourcemaps(error).then(() => {
this.setState({mappedError: error})
}).catch(console.error)
}
render () {
const {mappedError} = this.state
const {error} = this.props
if (!error.sourceMapsApplied && mappedError === null) {
return <div style={styles.errorDebug}>
<h1 style={styles.heading}>Loading stacktrace...</h1>
</div>
}
return <ErrorDebug error={error} />
}
}
// On the server side the error has sourcemaps already applied, so `ErrorDebug` is rendered directly.
export default function ErrorDebug ({error}) {
const { name, message, module } = error
return (
<div style={styles.errorDebug}>
<Head>
<meta name='viewport' content='width=device-width, initial-scale=1.0' />
</Head>
{module ? <h1 style={styles.heading}>Error in {module.rawRequest}</h1> : null}
{
name === 'ModuleBuildError'
? <pre style={styles.stack} dangerouslySetInnerHTML={{ __html: ansiHTML(encodeHtml(message)) }} />
: <StackTrace error={error} />
}
</div>
)
}
const StackTrace = ({ error: { name, message, stack, info } }) => (
<div>
<div style={styles.heading}>{message || name}</div>
<pre style={styles.stack}>
{stack}
</pre>
{info && <pre style={styles.stack}>
{info.componentStack}
</pre>}
</div>
)
const styles = {
errorDebug: {
background: '#0e0d0d',
boxSizing: 'border-box',
overflow: 'auto',
padding: '24px',
position: 'fixed',
left: 0,
right: 0,
top: 0,
bottom: 0,
zIndex: 9999,
color: '#b3adac'
},
stack: {
fontFamily: '"SF Mono", "Roboto Mono", "Fira Mono", consolas, menlo-regular, monospace',
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fontSize: '13px',
lineHeight: '18px',
color: '#b3adac',
margin: 0,
whiteSpace: 'pre-wrap',
wordWrap: 'break-word',
marginTop: '16px'
},
heading: {
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fontFamily: '-apple-system, system-ui, BlinkMacSystemFont, Roboto, "Segoe UI", "Fira Sans", Avenir, "Helvetica Neue", "Lucida Grande", sans-serif',
fontSize: '20px',
fontWeight: '400',
lineHeight: '28px',
color: '#fff',
marginBottom: '0px',
marginTop: '0px'
}
}
const encodeHtml = str => {
return str.replace(/</g, '&lt;').replace(/>/g, '&gt;')
}
// see color definitions of babel-code-frame:
// https://github.com/babel/babel/blob/master/packages/babel-code-frame/src/index.js
ansiHTML.setColors({
reset: ['6F6767', '0e0d0d'],
darkgrey: '6F6767',
yellow: '6F6767',
green: 'ebe7e5',
magenta: 'ebe7e5',
blue: 'ebe7e5',
cyan: 'ebe7e5',
red: 'ff001f'
})