mo.ui.anywidget doesn't show the api of widgets

[metaboulie]

Describe the bug

https://github.com/user-attachments/assets/d9e96a18-4078-46d4-8ddf-92e9edab87c6

Environment

{
  "marimo": "0.9.20",
  "OS": "Darwin",
  "OS Version": "24.0.0",
  "Processor": "arm",
  "Python Version": "3.12.7",
  "Binaries": {
    "Browser": "--",
    "Node": "v23.2.0"
  },
  "Dependencies": {
    "click": "8.1.7",
    "docutils": "0.21.2",
    "itsdangerous": "2.2.0",
    "jedi": "0.19.2",
    "markdown": "3.7",
    "narwhals": "1.13.3",
    "packaging": "24.2",
    "psutil": "6.1.0",
    "pygments": "2.18.0",
    "pymdown-extensions": "10.12",
    "pyyaml": "6.0.2",
    "ruff": "0.7.3",
    "starlette": "0.41.2",
    "tomlkit": "0.13.2",
    "typing-extensions": "4.12.2",
    "uvicorn": "0.32.0",
    "websockets": "12.0"
  },
  "Optional Dependencies": {
    "anywidget": "0.9.13"
  }
}

Code to reproduce

import marimo as mo

import anywidget
import traitlets

class Foo(anywidget.AnyWidget):
    _esm = ""
    _css = ""

    def foo(self, arg_1, arg_2):
        """A dummy method."""
        return arg_1 + arg_2

mo_widget = mo.ui.anywidget(Foo())
widget = Foo()

mo_widget.foo(1, 2)

widget.foo(1, 2)

[mscolnick]

In case anyone else has ideas, I tried adding this code to class anywidget's __init__:

        # Copy annotations
        self.__annotations__ = getattr(widget.__class__, "__annotations__", {})
        # Add runtime-discovered attributes to annotations
        for name in dir(widget):
            if not name.startswith("_"):
                attr = getattr(widget, name)
                self.__annotations__[name] = type(attr)

but it did not end up working