Composition

import { Dependency } from '@quantform/core';

const MyConfig = Symbol('my-config');

export function myConfigOptions(config: { apiUrl: string }): Dependency {
  return {
    provide: MyConfig,
    useValue: config
  };
}

import { EMPTY } from 'rxjs';
import { behavior, strategy, useContext } from '@quantform/core';

const MyConfig = Symbol('my-config');

export default strategy(() => {
  behavior(() => {
    const cfg = useContext<{ apiUrl: string }>(MyConfig);
    // ...
    return EMPTY;
  });

  return [myConfigOptions({ apiUrl: 'https://api.example.com' })];
});

import { Dependency, useContext } from '@quantform/core';

const MyService = Symbol('my-service');

export interface MyServiceApi {
  fetchBalance(): Promise<number>;
}

export function useMyService() {
  return useContext<MyServiceApi>(MyService);
}

useMyService.options = (impl: MyServiceApi): Dependency => ({
  provide: MyService,
  useValue: impl
});