typescript-apollo-angular ignores importOperationTypesFrom

[jbarrus]

Describe the bug
https://graphql-code-generator.com/docs/plugins/typescript-apollo-angular lists importOperationTypesFrom as a valid config but it is ignored

To Reproduce
Steps to reproduce the behavior:

schema: "schema.graphql"
generates:
  types.ts:
    plugins:
      - "typescript"
  operations.ts:
    documents: "document.graphql"
    config:
      documentMode: graphQLTag
    presetConfig:
      baseTypesPath: types.ts
    plugins:
      - "typescript-operations"
      - "typed-document-node"
  angular.ts:
    documents: "document.graphql"
    config:
      documentMode: external
      importOperationTypesFrom: "Operations"
      importDocumentNodeExternallyFrom: "./document.generated"
    plugins:
      - "typescript-apollo-angular"

https://codesandbox.io/s/hungry-saha-4t2pq?file=/angular.ts

Additional Context
I'm trying to generate types and operations in one lib and angular services in another to segregate the angular dependency (i.e. I want to be able to import operations from non-angular code and not pull in angular as a dependency). The examples for this are somewhat limited, so I may be doing this wrong, but I think I have the right config but the "importOperationTypesFrom" doesn't seem to be implemented in the typescript-apollo-angular plugin.
https://github.com/dotansimha/graphql-code-generator/blob/master/packages/plugins/typescript/apollo-angular/src/visitor.ts#L263

As a note, this does appear to be implemented in the typescript-apollo-react plugin:
https://github.com/dotansimha/graphql-code-generator/blob/master/packages/plugins/typescript/react-apollo/src/visitor.ts#L442

[jbarrus]

Sorry to pollute this issue, I can submit another, but I'm having another problem with this approach as well - when documentMode is set to external for the angular.ts output, the document names do not match in angular.ts.

angular.ts example service when generated in the same file as operations

export const UserDocument = gql`
    query user {
  user(id: 1) {
    id
    username
    email
  }
}
    `;

  @Injectable({
    providedIn: 'root'
  })
  export class UserGQL extends Apollo.Query<UserQuery, UserQueryVariables> {
    document = UserDocument;
    
    constructor(apollo: Apollo.Apollo) {
      super(apollo);
    }
  }

when imported from a separate file using documentMode external

  @Injectable({
    providedIn: 'root'
  })
  export class UserGQL extends Apollo.Query<UserQuery, UserQueryVariables> {
    document = Operations.user;
    
    constructor(apollo: Apollo.Apollo) {
      super(apollo);
    }
  }

expected is

  @Injectable({
    providedIn: 'root'
  })
  export class UserGQL extends Apollo.Query<UserQuery, UserQueryVariables> {
    document = Operations.UserDocument;
    
    constructor(apollo: Apollo.Apollo) {
      super(apollo);
    }
  }

[dotansimha]

Fixed in @graphql-codegen/typescript-apollo-angular@2.1.0