playwright-stealth 2.0.0 removed `stealth_async` (and `stealth_sync`). Pin back with `python -m pip install 'playwright-stealth<2.0.0'`, or migrate to the 2.x API. If you use crawl4ai, check its pinned stealth version first, since the crawler manages this dependency for you.

## The error

```text
ImportError: cannot import name 'stealth_async' from 'playwright_stealth'
```

## Fix it

1. **Check the installed version**

```
python -m pip show playwright-stealth | head -2
```
Expected: 2.x.

2. **Quick fix: pin below 2.0**

```
python -m pip install 'playwright-stealth<2.0.0'
```
Expected: the 1.x line restores `stealth_async`.

3. **Confirm**

```
python -c "from playwright_stealth import stealth_async; print('ok')"
```
Expected: prints `ok`.

## When this applies

- the ImportError names `stealth_async` from `playwright_stealth`
- async scraping code from the 1.x era, including crawl4ai setups

## When it does NOT apply

- `No module named 'playwright_stealth'` is the missing install
- `stealth_sync` is the sync twin, same release removed both

## Compatibility

playwright-stealth 1.x has it, 2.0.0 removed it.

## Why it happens

Same 2.0.0 breaking rewrite as the sync helper: both convenience functions were dropped without a shim, and unpinned upgrades break existing imports.

## Edge cases

- crawl4ai users: the crawler pins its own stealth dependency range. If you pin manually, keep it consistent with crawl4ai's requirements or you get a resolver fight.