str(JsProxy) raising TypeError

[CNSeniorious000]

When I try to str() a JsProxy in python scope, a TypeError occurs that:

TypeError: Pyodide cannot generate a repr for this Javascript object because it has no 'toString' method

Note that the JsProxy is a Module object.

To Reproduce

>>> from pyodide.code import run_js
>>> a_simple_module = await run_js("import('https://esm.run/partial-json')")
>>> str(a_simple_module)

Expected behavior

Traceback (most recent call last):
  File "<console>", line 1, in <module>
TypeError: Pyodide cannot generate a repr for this Javascript object because it has no 'toString' method

Environment

the console.html from the pyodide docs.

[CNSeniorious000]

I know a Module object can't be .toString() or String() in JavaScript, but console.log always works. I wonder how to generate a string representation for a JavaScript object promisingly.

I think, in python, str() shouldn't raise an error, usually.

[hoodmane]

Thanks for the report! We probably should fall back to Object.prototype.toString.call in this case. That would render it as '[object Module]' which isn't useful persay but at least doesn't throw. @ryanking13 wdyt?

To avoid the request, a better repro is:

from pyodide.code import run_js

mod = await run_js("import('data:text/javascript,')")
print(mod)

[CNSeniorious000]

Apologies for my lack of familiarity with the import syntax. I support this approach too.

[ryanking13]

Yes, I agree that str and repr should success always even if the result is not very helpful. Using Object.prototype.toString.call seems reasonable to me.