Files
next.js/test/unit/recursive-delete.test.ts
Benjamin WoodruffandGitHub 3e65babdea perf: Use synchronous IO when cleaning distDir in next dev and next build (#84472)
This is blocking the critical path for starting `next build` (on both webpack and Turbopack) and `next dev` (only on webpack).

## Testing

Run

```
pnpm next build --turbopack --experimental-build-mode compile
```

a couple of times in `~/front/apps/conf-2025` (small-medium size app).

### Before

![Screenshot 2025-10-02 at 3.09.31 PM.png](https://app.graphite.dev/user-attachments/assets/ad56ebc1-a9dd-4b18-ba51-50435c9e6584.png)

### After

![Screenshot 2025-10-02 at 3.03.25 PM.png](https://app.graphite.dev/user-attachments/assets/39170ed1-7379-48ac-aeed-638b57322a6a.png)
2025-10-03 13:06:01 -07:00

63 lines
2.0 KiB
TypeScript

/* eslint-env jest */
import fs from 'fs-extra'
import {
recursiveDeleteSyncWithAsyncRetries,
calcBackoffMs,
} from 'next/dist/lib/recursive-delete'
import { recursiveReadDir } from 'next/dist/lib/recursive-readdir'
import { recursiveCopy } from 'next/dist/lib/recursive-copy'
import { join } from 'path'
const resolveDataDir = join(__dirname, 'isolated', '_resolvedata')
const testResolveDataDir = join(__dirname, 'isolated', 'test_resolvedata')
const testpreservefileDir = join(__dirname, 'isolated', 'preservefiles')
describe('recursiveDeleteSyncWithAsyncRetries', () => {
if (process.platform === 'win32') {
it('should skip on windows to avoid symlink issues', () => {})
return
}
it('should work', async () => {
expect.assertions(1)
try {
await recursiveCopy(resolveDataDir, testResolveDataDir)
await fs.symlink('./aa', join(testResolveDataDir, 'symlink'))
await recursiveDeleteSyncWithAsyncRetries(testResolveDataDir)
const result = await recursiveReadDir(testResolveDataDir)
expect(result.length).toBe(0)
} finally {
await recursiveDeleteSyncWithAsyncRetries(testResolveDataDir)
}
})
it('should exclude', async () => {
expect.assertions(2)
try {
await recursiveCopy(resolveDataDir, testpreservefileDir, {
overwrite: true,
})
// preserve cache dir
await recursiveDeleteSyncWithAsyncRetries(testpreservefileDir, /^cache/)
const result = await recursiveReadDir(testpreservefileDir)
expect(result.length).toBe(1)
} finally {
// Ensure test cleanup
await recursiveDeleteSyncWithAsyncRetries(testpreservefileDir)
const cleanupResult = await recursiveReadDir(testpreservefileDir)
expect(cleanupResult.length).toBe(0)
}
})
})
describe('calcBackoffMs', () => {
it('returns expected values', () => {
let backoffValuesMs = Array.from({ length: 6 }, (_, attempt) =>
calcBackoffMs(attempt)
)
expect(backoffValuesMs).toEqual([8, 16, 32, 64, 64, 64])
})
})