v4 - incompatible `ErrorHandler` context type

[barjin]

The following snippet compiles without errors in v3, but throws errors (see below) with v4. What's the expected argument type for ErrorHandler in v4? Do we explicitly export this type / interface?

This pattern (creating crawler options as explicitly typed functions) is used e.g. in https://github.com/apify/actor-scraper

First observed here.