How to use SelectionSetToObject class?

[ertrzyiks]

I want to generate a Typescript object that matches the type generated for the operation. SelectionSetToObject class looks very useful for this use case. It knows how to map all the document selection to the types, even for the fragments. However, I'm puzzled how to properly access this information.

transformSelectionSet is the only public method I found to access the final shape of the object. However, the return type is a string and it's not clear to me what is the format of that string. Is it always a typescript interface? If no, is the format of that string specified somewhere?

[ertrzyiks]

I created a subclass of SelectionSetToObject that overrides transformSelectionSet method and use it in my BaseDocumentsVisitor instead.

Update the visitor selection set handler

 this.setSelectionSetHandler(new SelectionSetToFactory(...))

Plus

class SelectionSetToFactory<Config extends ParsedDocumentsConfig = ParsedDocumentsConfig> extends SelectionSetToObject<Config> {
  public transformSelectionSet() {
    return 'a new content here'
  }

  createNext(parentSchemaType: GraphQLNamedType, selectionSet: SelectionSetNode) {
    return new SelectionSetToFactory(this._processor, this._scalars, this._schema, this._convertName.bind(this), this._getFragmentSuffix.bind(this), this._loadedFragments, this._config, parentSchemaType, selectionSet);
  }
}

and this way I have access to all the data and fully control the output format 👍