Feathers: How to make `context.app.service('service-name')` Typed?

[ismail-codinglab]

I am running a feathers v4 app converted from v3 and am trying to make everything typed.

This is perfectly typed

But when I do it this way, it's not typed at all.

I did my research, could not find it in the docs, nor in known examples

Two questions:

• How can I make it typed?
• Is there an example that is fully typed?

[daffl]

This is currently not possible other than casting the app into the Application from the declarations but will change in a future version.

[ismail-codinglab]

but will change in a future version.

Does this mean you have a possible solution in mind I can work with?
Or should I try myself to get something like that working?

[ismail-codinglab]

As a temporary workaround can you make the context.app.service accept a generic?
e.g.

context.app.service<AsdModel>('asd');

[robbyphillips]

As a workaround, I have found that extending HookContext in the declarations file is sufficient.

// declarations.d.ts

import { Application as ExpressFeathers } from '@feathersjs/express'
import { HookContext as FeathersHookContext } from '@feathersjs/feathers'

// A mapping of service names to types. Will be extended in service files.
export interface ServiceTypes {}
// The application instance type that will be used everywhere else
export type Application = ExpressFeathers<ServiceTypes>

export interface HookContext<T = any> extends FeathersHookContext<T> {
  app: Application
}

Then I import the HookContext from declarations instead of feathers.

[ismail-codinglab]

Yes that's exactly what I did. And I have put in eslint/tslint the hookContext from feathers in the banned imports so developers can't by accident import the wrong hookccontext

[latipun7]

This is currently not possible other than casting the app into the Application from the declarations but will change in a future version.

It would be great if app.get(name) is typed too. #1952