Consider using an overridable Services interface

[nfroidure]

In order to allow users to override it and get auto-completion for services injections, a global Services interface mapping to all services types could be useful.

It would give something like services.d.ts in the root of projects sources:

import type { BaseServices } from 'knifecycle'; // For injector/instance etc...

declare module 'knifecycle' {
  // Eventually override the process env type here
  export interface Services
    extends Services {
      pg: PGService;
      log: LogService;
      // ...
  }

Maybe that using this could help: https://www.typescriptlang.org/docs/handbook/declaration-merging.html