next": "8.0.0-canary.17 acorn workaround does not work

```
error  in ./node_modules/next/dist/client/next-dev.js

Module parse failed: Unexpected token (34:6)
You may need an appropriate loader to handle this file type.
|
|
> import('./noop');
| var _window = window,
|     assetPrefix = _window.__NEXT_DATA__.assetPrefix;

 @ multi ./node_modules/next/dist/client/next-dev
```

But if I add "acorn": "^6.0.5" to dependencies, it works.