Typescript types missing? about elix HOT 3 OPEN

I've finally had a chance to look at this. There are several things going on here.

• The TypeScript declarations in ListBox.d.ts was missing SelectedValueAPIMixin, the mixin that defines the value property. I've checked in a fix for that in the main branch.
• The render method isn't something that's exposed with a string name "render", it's defined with a Symbol called internal.render. For a long time, TypeScript had problems with Symbol-keyed methods like the ones Elix uses, so the Elix code base resorted to some shenanigans that, as a side effect, convinced TypeScript that there is a method called _render. I believe TypeScript has improved its support for Symbol-keyed methods, so it may be possible to drop those shenanigans.
• Some of the plain components like PlainListBox are missing a .d.ts file. I've just checked in one for PlainListBox, and this partially addresses the problem. Using what's on the main branch, it should now be possible to get type information for an import from elix/src/base/ListBox.js or elix/src/plain/PlainListBox.js.
• But there's still something preventing the list box types from going all the way through to an import from elix/define/ListBox.js. That's puzzling, as it is possible to get types for elix/define/DateComboBox.js, and as far as I can tell both the list box and date combo box are defined in exactly the same way.

I'd investigate further, but I really don't have much to go on.

from elix.

https://codesandbox.io/s/elix-typescript-yeprli

from elix.

This seems to work - import types from the base folder. Not sure why that is necessary.

import type ListBox from "elix/src/base/ListBox";

Well maybe not. I can access the selectedIndex and selectedItem props, but not value. There is a _render but not a render.

from elix.