description

# PrintHandler typedef

PrintHandler = void Function(Zone self, ZoneDelegate parent, Zone zone, String line)

The type of a custom Zone.print implementation function.

A function used as ZoneSpecification.print to specialize the behavior of a new zone.

Receives the Zone that the handler was registered on as `self`, a delegate forwarding to the handlers of `self`'s parent zone as `parent`, and the current zone where the error was uncaught as `zone`, which will have `self` as a parent zone.

The string `line` is the one which was passed to Zone.print of `zone`, (possibly through the global print function).

The custom handler can intercept print operations and redirect them to other targets than the console.

The function must only access zone-related functionality through `self`, `parent` or `zone`. It should not depend on the current zone (Zone.current).

## Implementation

    typedef PrintHandler = void Function(
      Zone self,
      ZoneDelegate parent,
      Zone zone,
      String line,
    );