Feature-request: A way to obtain function/constructor parameter information through the vm_services

[Norbert515]

Hi all,

Would it be possible to obtain more information about a function using the VM services? Currently, I'm using the runtimeType string you get from a function to parse out that information - this is pretty hard to do, and more importantly, it doesn't work for constructors as the runtimeType is just the type of the class.

Proposal:

Add arguments field to Function. It should contain positional arguments (in correct order), named arguments (in addition to their names), and optional arguments.

Happy to help in some way if I can.

[jacob314]

Fyi @nshahan @bkonyi
It isn't a top priority for but it would be nice to leverage this in Dart DevTools and IDEs to show clearer debugging views for instances of generic functions and classes. Right now it can sometimes be a little hard to tell figure out what the inferred types were.

[bkonyi]

I'm working on exposing function signature information on the Function object (see this WIP CL for the proposed changes).

We're just working out issues with how generic type parameters are represented, as there's some inconsistencies as to what names for type parameters are returned in different contexts. Hopefully we'll be able to land this in the next few weeks.

[nshahan]

FYI @annagrin