.orFail() and Typescript: object can never be null

[fromi]

Using Typescript, .orFail() should return a promise that cannot resolve to null. Currently it is not the case:

const foo = await FooModel.findById(id).orFail()
return foo.bar // Error TS2531: Object is possibly 'null'.

Expected behavior: foo should not be typed as nullable when orFail is used.

[vkarpov15]

Please open up an issue with your typescript bindings, we don't have any officially supported bindings. Follow #8108 for updates.