Typescript: KeyError for optional Generic Fields

[maximilianmaihoefner]

When trying to run sphinx-js over an interface with an optional field with a generic type a KeyError gets thrown.

The code being documented:
interface GenericInterface<T> { optionalField?: T; }

Gives the following Error:
Exception occurred: File "/usr/local/lib/python3.7/site-packages/sphinx_js/typedoc.py", line 123, in make_type_name node = self.nodelist[type.get('id')] KeyError: 201

Using:
TypeScript 3.5.3
TypeDoc 0.15.0
Sphinx 2.2.0
Sphinx-JS 2.8

The workaround for now is to make the Field not optional, which is fine, but it would be better to have it supported by sphinx-js.

[maximilianmaihoefner]

Another workaround I found is to explicitly type the field as undefined e.g. optionalField: T | undefined. Which works for me. It still would be nice if this was supported or at least throw a more descriptive error, it was quite the hunt to find out what actually caused the error.

[erikrose]

Thanks for the report and the nicely reduced testcase! I can't promise when we'll get to this, but I'm personally interested in getting #120 landed, after which it should be much easier to navigate within our typescript module.