storybook/docs/_snippets/apollo-module.md

import { NgModule } from '@angular/core';
import { APOLLO_OPTIONS } from 'apollo-angular';
import { ApolloClientOptions, InMemoryCache } from '@apollo/client/core';
import { HttpLink } from 'apollo-angular/http';

// See here for docs https://apollo-angular.com/docs/get-started

const uri = 'https://your-graphql-endpoint';
export function createApollo(httpLink: HttpLink): ApolloClientOptions<any> {
  return {
    link: httpLink.create({ uri }),
    cache: new InMemoryCache(),
    defaultOptions: {
      watchQuery: {
        fetchPolicy: 'no-cache',
        errorPolicy: 'all',
      },
      query: {
        fetchPolicy: 'no-cache',
        errorPolicy: 'all',
      },
    },
  };
}

@NgModule({
  providers: [
    {
      provide: APOLLO_OPTIONS,
      useFactory: createApollo,
      deps: [HttpLink],
    },
  ],
})
export class MockGraphQLModule {}