cookieJar.fromJSON is not a function

```
const cookieJar = new tough.CookieJar()
const cookie = new tough.Cookie()
cookie.fromJSON(json)
cookieJar.fromJSON(json)
```
This simple code outputs this error.
```cookie.fromJSON is not a function```

 I feel stupid but it seems to me that I am doing it according to docs but the cookieJar doesn't have any import json functions