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/* eslint-env jest */
import { createSandbox } from 'development-sandbox'
import { FileRef, nextTestSetup } from 'e2e-utils'
import { check } from 'next-test-utils'
import path from 'path'
import { outdent } from 'outdent'
const isRspack = !!process.env.NEXT_RSPACK
describe('Error recovery app', () => {
const { next, isTurbopack } = nextTestSetup({
files: new FileRef(path.join(__dirname, 'fixtures', 'default-template')),
skipStart: true,
})
test('can recover from a syntax error without losing state', async () => {
await using sandbox = await createSandbox(next)
const { browser, session } = sandbox
await session.patch(
'index.js',
outdent`
import { useCallback, useState } from 'react'
export default function Index() {
const [count, setCount] = useState(0)
const increment = useCallback(() => setCount(c => c + 1), [setCount])
return (
<main>
<p>{count}</p>
<button onClick={increment}>Increment</button>
</main>
)
}
`
)
await browser.elementByCss('button').click()
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('1')
await session.patch('index.js', `export default () => <div/`)
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js (1:27)
Parsing ecmascript source code failed
> 1 | export default () => <div/
| ^",
"stack": [],
}
`)
} else if (isRspack) {
await expect({ browser, next }).toDisplayRedbox(`
{
"description": " × Module build failed:",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
× Module build failed:
╰─▶ × Error: x Unexpected eof
│ ,----
│ 1 | export default () => <div/
│ \`----
│
│
│ Caused by:
│ Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Unexpected eof",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
Error: x Unexpected eof
,----
1 | export default () => <div/
\`----
Caused by:
Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
}
await session.patch(
'index.js',
outdent`
import { useCallback, useState } from 'react'
export default function Index() {
const [count, setCount] = useState(0)
const increment = useCallback(() => setCount(c => c + 1), [setCount])
return (
<main>
<p>Count: {count}</p>
<button onClick={increment}>Increment</button>
</main>
)
}
`
)
await session.assertNoRedbox()
await check(
() => session.evaluate(() => document.querySelector('p').textContent),
/Count: 1/
)
})
test('server component can recover from syntax error', async () => {
const type = 'server'
await using sandbox = await createSandbox(next, undefined, '/' + type)
const { browser, session } = sandbox
// Add syntax error
await session.patch(
`app/${type}/page.js`,
outdent`
export default function Page() {
return <p>Hello world</p>
`
)
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/server/page.js (2:26)
Parsing ecmascript source code failed
> 2 | return <p>Hello world</p>
| ^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '}', got '<eof>'",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/server/page.js
Error: x Expected '}', got '<eof>'
,-[2:1]
1 | export default function Page() {
2 | return <p>Hello world</p>
: ^
\`----
Caused by:
Syntax Error
Import trace for requested module:
./app/server/page.js",
"stack": [],
}
`)
}
// Fix syntax error
await session.patch(
`app/${type}/page.js`,
outdent`
export default function Page() {
return <p>Hello world 2</p>
}
`
)
await check(
() => session.evaluate(() => document.querySelector('p').textContent),
'Hello world 2'
)
})
test('client component can recover from syntax error', async () => {
const type = 'client'
await using sandbox = await createSandbox(next, undefined, '/' + type)
const { browser, session } = sandbox
// Add syntax error
await session.patch(
`app/${type}/page.js`,
outdent`
export default function Page() {
return <p>Hello world</p>
`
)
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/client/page.js (2:26)
Parsing ecmascript source code failed
> 2 | return <p>Hello world</p>
| ^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '}', got '<eof>'",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/client/page.js
Error: x Expected '}', got '<eof>'
,-[2:1]
1 | export default function Page() {
2 | return <p>Hello world</p>
: ^
\`----
Caused by:
Syntax Error
Import trace for requested module:
./app/client/page.js",
"stack": [],
}
`)
}
// Fix syntax error
await session.patch(
`app/${type}/page.js`,
outdent`
export default function Page() {
return <p>Hello world 2</p>
}
`
)
await check(
() => session.evaluate(() => document.querySelector('p').textContent),
'Hello world 2'
)
})
test('can recover from a event handler error', async () => {
await using sandbox = await createSandbox(next)
const { browser, session } = sandbox
await session.patch(
'index.js',
outdent`
import { useCallback, useState } from 'react'
export default function Index() {
const [count, setCount] = useState(0)
const increment = useCallback(() => {
setCount(c => c + 1)
throw new Error('oops')
}, [setCount])
return (
<main>
<p>{count}</p>
<button onClick={increment}>Increment</button>
</main>
)
}
`
)
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('0')
await browser.elementByCss('button').click()
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('1')
if (isTurbopack) {
// TODO(veil): Location of Page should be app/page.js
// TODO(sokra): The location is wrong because of an bug with HMR and source maps.
// When the code `index.js` changes, this also moves the locations of `app/page.js` in the bundled file.
// So the SourceMap is updated to reflect that. But the browser still has the old bundled file loaded.
// So we look up locations from the old bundle in the new source maps, which leads to mismatched locations.
await expect(browser).toDisplayCollapsedRedbox(`
{
"description": "oops",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (7:11) @ Index.useCallback[increment]
> 7 | throw new Error('oops')
| ^",
"stack": [
"Index.useCallback[increment] index.js (7:11)",
"button <anonymous>",
"Index index.js (12:7)",
"Page index.js (8:16)",
],
}
`)
} else {
await expect(browser).toDisplayCollapsedRedbox(`
{
"description": "oops",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (7:11) @ Index.useCallback[increment]
> 7 | throw new Error('oops')
| ^",
"stack": [
"Index.useCallback[increment] index.js (7:11)",
"button <anonymous>",
"Index index.js (12:7)",
"Page app/page.js (4:10)",
],
}
`)
}
await session.patch(
'index.js',
outdent`
import { useCallback, useState } from 'react'
export default function Index() {
const [count, setCount] = useState(0)
const increment = useCallback(() => setCount(c => c + 1), [setCount])
return (
<main>
<p>Count: {count}</p>
<button onClick={increment}>Increment</button>
</main>
)
}
`
)
await session.assertNoRedbox()
expect(await session.hasErrorToast()).toBe(false)
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('Count: 1')
await browser.elementByCss('button').click()
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('Count: 2')
await session.assertNoRedbox()
expect(await session.hasErrorToast()).toBe(false)
})
test('server component can recover from a component error', async () => {
const type = 'server'
await using sandbox = await createSandbox(next, undefined, '/' + type)
const { session, browser } = sandbox
await session.write(
'child.js',
outdent`
export default function Child() {
return <p>Hello</p>;
}
`
)
await session.patch(
'index.js',
outdent`
import Child from './child'
export default function Index() {
return (
<main>
<Child />
</main>
)
}
`
)
expect(await browser.elementByCss('p').text()).toBe('Hello')
await session.patch(
'child.js',
outdent`
// hello
export default function Child() {
throw new Error('oops')
}
`
)
await expect(browser).toDisplayRedbox(
`
{
"description": "oops",
"environmentLabel": "Server",
"label": "<FIXME-excluded-label>",
"source": "child.js (3:9) @ Child
> 3 | throw new Error('oops')
| ^",
"stack": [
"Child child.js (3:9)",
"Page app/server/page.js (3:10)",
],
}
`,
// FIXME: `label` is flaking between "Runtime Error" and "Recoverable Error"
{ label: false }
)
// TODO-APP: re-enable when error recovery doesn't reload the page.
/* const didNotReload = */ await session.patch(
'child.js',
outdent`
export default function Child() {
return <p>Hello</p>;
}
`
)
// TODO-APP: re-enable when error recovery doesn't reload the page.
// expect(didNotReload).toBe(true)
await session.assertNoRedbox()
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('Hello')
})
test('client component can recover from a component error', async () => {
const type = 'client'
await using sandbox = await createSandbox(next, undefined, '/' + type)
const { session, browser } = sandbox
await session.write(
'child.js',
outdent`
export default function Child() {
return <p>Hello</p>;
}
`
)
await session.patch(
'index.js',
outdent`
import Child from './child'
export default function Index() {
return (
<main>
<Child />
</main>
)
}
`
)
expect(await browser.elementByCss('p').text()).toBe('Hello')
await session.patch(
'child.js',
outdent`
// hello
export default function Child() {
throw new Error('oops')
}
`
)
if (isTurbopack) {
// <FIXME-file-protocol>: https://linear.app/vercel/issue/NDX-920/
await expect(browser).toDisplayRedbox(`
{
"description": "oops",
"environmentLabel": null,
"label": "Runtime Error",
"source": "child.js (3:9) @ Child
> 3 | throw new Error('oops')
| ^",
"stack": [
"Child child.js (3:9)",
"<FIXME-file-protocol>",
"<FIXME-file-protocol>",
"Index index.js (6:7)",
"<FIXME-file-protocol>",
],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": "oops",
"environmentLabel": null,
"label": "Runtime Error",
"source": "child.js (3:9) @ Child
> 3 | throw new Error('oops')
| ^",
"stack": [
"Child child.js (3:9)",
"Index index.js (6:7)",
"Page app/client/page.js (4:10)",
],
}
`)
}
// TODO-APP: re-enable when error recovery doesn't reload the page.
/* const didNotReload = */ await session.patch(
'child.js',
outdent`
export default function Child() {
return <p>Hello</p>;
}
`
)
// TODO-APP: re-enable when error recovery doesn't reload the page.
// expect(didNotReload).toBe(true)
await session.assertNoRedbox()
expect(
await session.evaluate(() => document.querySelector('p').textContent)
).toBe('Hello')
})
// https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554150098
test('syntax > runtime error', async () => {
await using sandbox = await createSandbox(next)
const { browser, session } = sandbox
// Start here.
await session.patch(
'index.js',
outdent`
import * as React from 'react';
export default function FunctionNamed() {
return <div />
}
`
)
// TODO: this acts weird without above step
await session.patch(
'index.js',
outdent`
import * as React from 'react';
let i = 0
window.triggerError = () => {
// TODO(veil): sync thrown errors do not trigger Redbox.
setTimeout(() => {
i++
throw Error('no ' + i)
}, 0)
}
export default function FunctionNamed() {
return <div />
}
`
)
await browser.eval('window.triggerError()')
if (isRspack) {
await expect(browser).toDisplayCollapsedRedbox(`
{
"description": "no 1",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (7:11) @ eval
> 7 | throw Error('no ' + i)
| ^",
"stack": [
"eval index.js (7:11)",
],
}
`)
} else {
await expect(browser).toDisplayCollapsedRedbox(`
{
"description": "no 1",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (7:11) @ eval
> 7 | throw Error('no ' + i)
| ^",
"stack": [
"eval index.js (7:11)",
],
}
`)
}
// Make a syntax error.
await session.patch(
'index.js',
outdent`
import * as React from 'react';
let i = 0
window.triggerError = () => {
// TODO(veil): sync thrown errors do not trigger Redbox.
setTimeout(() => {
i++
throw Error('no ' + i)
}, 0)
}
export default function FunctionNamed() {
`
)
await new Promise((resolve) => setTimeout(resolve, 1000))
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js (10:39)
Parsing ecmascript source code failed
> 10 | export default function FunctionNamed() {
| ^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '}', got '<eof>'",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
Error: x Expected '}', got '<eof>'
,-[10:1]
10 | export default function FunctionNamed() {
: ^
\`----
Caused by:
Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
}
// Test that runtime error does not take over:
await browser.eval('window.triggerError()')
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js (10:39)
Parsing ecmascript source code failed
> 10 | export default function FunctionNamed() {
| ^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '}', got '<eof>'",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
Error: x Expected '}', got '<eof>'
,-[10:1]
10 | export default function FunctionNamed() {
: ^
\`----
Caused by:
Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
}
})
// https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554144016
test('stuck error', async () => {
await using sandbox = await createSandbox(next)
const { browser, session } = sandbox
// We start here.
await session.patch(
'index.js',
outdent`
import * as React from 'react';
function FunctionDefault() {
return <h1>Default Export Function</h1>;
}
export default FunctionDefault;
`
)
// We add a new file. Let's call it Foo.js.
await session.write(
'Foo.js',
outdent`
// intentionally skips export
export default function Foo() {
return React.createElement('h1', null, 'Foo');
}
`
)
// We edit our first file to use it.
await session.patch(
'index.js',
outdent`
import * as React from 'react';
import Foo from './Foo';
function FunctionDefault() {
return <Foo />;
}
export default FunctionDefault;
`
)
// We get an error because Foo didn't import React. Fair.
if (isTurbopack) {
// <FIXME-file-protocol>: https://linear.app/vercel/issue/NDX-920/
await expect(browser).toDisplayRedbox(`
{
"description": "React is not defined",
"environmentLabel": null,
"label": "Runtime ReferenceError",
"source": "Foo.js (3:3) @ Foo
> 3 | return React.createElement('h1', null, 'Foo');
| ^",
"stack": [
"Foo Foo.js (3:3)",
"<FIXME-file-protocol>",
"<FIXME-file-protocol>",
"FunctionDefault index.js (4:10)",
"<FIXME-file-protocol>",
],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": "React is not defined",
"environmentLabel": null,
"label": "Runtime ReferenceError",
"source": "Foo.js (3:3) @ Foo
> 3 | return React.createElement('h1', null, 'Foo');
| ^",
"stack": [
"Foo Foo.js (3:3)",
"FunctionDefault index.js (4:10)",
"Page app/page.js (4:10)",
],
}
`)
}
// Let's add that to Foo.
await session.patch(
'Foo.js',
outdent`
import * as React from 'react';
export default function Foo() {
return React.createElement('h1', null, 'Foo');
}
`
)
// Expected: this fixes the problem
await session.assertNoRedbox()
})
// https://github.com/pmmmwh/react-refresh-webpack-plugin/pull/3#issuecomment-554137262
test('render error not shown right after syntax error', async () => {
await using sandbox = await createSandbox(next)
const { browser, session } = sandbox
// Starting here:
await session.patch(
'index.js',
outdent`
import * as React from 'react';
class ClassDefault extends React.Component {
render() {
return <h1>Default Export</h1>;
}
}
export default ClassDefault;
`
)
expect(
await session.evaluate(() => document.querySelector('h1').textContent)
).toBe('Default Export')
// Break it with a syntax error:
await session.patch(
'index.js',
outdent`
import * as React from 'react';
class ClassDefault extends React.Component {
render()
return <h1>Default Export</h1>;
}
}
export default ClassDefault;
`
)
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js (5:5)
Parsing ecmascript source code failed
> 5 | return <h1>Default Export</h1>;
| ^^^^^^",
"stack": [],
}
`)
} else if (isRspack) {
await expect({ browser, next }).toDisplayRedbox(`
{
"description": " × Module build failed:",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
× Module build failed:
╰─▶ × Error: x Expected '{', got 'return'
│ ,-[5:1]
│ 2 |
│ 3 | class ClassDefault extends React.Component {
│ 4 | render()
│ 5 | return <h1>Default Export</h1>;
│ : ^^^^^^
│ 6 | }
│ 7 | }
│ \`----
│
│
│ Caused by:
│ Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '{', got 'return'",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
Error: x Expected '{', got 'return'
,-[5:1]
2 |
3 | class ClassDefault extends React.Component {
4 | render()
5 | return <h1>Default Export</h1>;
: ^^^^^^
6 | }
7 | }
\`----
Caused by:
Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
}
// Now change the code to introduce a runtime error without fixing the syntax error:
await session.patch(
'index.js',
outdent`
import * as React from 'react';
class ClassDefault extends React.Component {
render()
throw new Error('nooo');
return <h1>Default Export</h1>;
}
}
export default ClassDefault;
`
)
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js (5:5)
Parsing ecmascript source code failed
> 5 | throw new Error('nooo');
| ^^^^^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '{', got 'throw'",
"environmentLabel": null,
"label": "Build Error",
"source": "./index.js
Error: x Expected '{', got 'throw'
,-[5:1]
2 |
3 | class ClassDefault extends React.Component {
4 | render()
5 | throw new Error('nooo');
: ^^^^^
6 | return <h1>Default Export</h1>;
7 | }
8 | }
\`----
Caused by:
Syntax Error
Import trace for requested module:
./index.js
./app/page.js",
"stack": [],
}
`)
}
// Now fix the syntax error:
await session.patch(
'index.js',
outdent`
import * as React from 'react';
class ClassDefault extends React.Component {
render() {
throw new Error('nooo');
return <h1>Default Export</h1>;
}
}
export default ClassDefault;
`
)
if (isTurbopack) {
// TODO(veil): Location of Page should be app/page.js
// <FIXME-file-protocol>: https://linear.app/vercel/issue/NDX-920/
await expect(browser).toDisplayRedbox(`
{
"description": "nooo",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (5:11) @ ClassDefault.render
> 5 | throw new Error('nooo');
| ^",
"stack": [
"ClassDefault.render index.js (5:11)",
"<FIXME-file-protocol>",
"<FIXME-file-protocol>",
"Page index.js (10:16)",
],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": "nooo",
"environmentLabel": null,
"label": "Runtime Error",
"source": "index.js (5:11) @ ClassDefault.render
> 5 | throw new Error('nooo');
| ^",
"stack": [
"ClassDefault.render index.js (5:11)",
"Page app/page.js (4:10)",
],
}
`)
}
})
test('displays build error on initial page load', async () => {
await using sandbox = await createSandbox(
next,
new Map([['app/page.js', '{{{']])
)
const { browser } = sandbox
if (isTurbopack) {
await expect(browser).toDisplayRedbox(`
{
"description": "Parsing ecmascript source code failed",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/page.js (1:2)
Parsing ecmascript source code failed
> 1 | {{{
| ^",
"stack": [],
}
`)
} else {
await expect(browser).toDisplayRedbox(`
{
"description": " x Expected '}', got '<eof>'",
"environmentLabel": null,
"label": "Build Error",
"source": "./app/page.js
Error: x Expected '}', got '<eof>'
,----
1 | {{{
: ^
\`----
Caused by:
Syntax Error",
"stack": [],
}
`)
}
})
})
|