What is the rationale behind labeling SDK resources as optional in @types/google-apps-script?

While the Admin SDK resources are all defined, they are marked as optional in the AdminDirectory interface. This decision can be seen in more detail at this link. But why are these clearly defined resources classified as optional?

The reason for this confusion arises when using TypeScript checker and encountering the error message "Object is possibly undefined" when trying to access something like

AdminDirectory.Domains.list("my_customer").domains
.

Answer №1

The simple truth is: "it's just the way it is."

When examining the DefinitelyTyped definitions file referenced in your query, it became evident that those attributes have been marked as optional since the inception of the file. In contrast, when reviewing the directory API within the official Google Node.JS SDK, these properties are deemed mandatory. Consequently, one can only speculate on whether this was a deliberate decision made by the individuals overseeing the DefinitelyTyped definitions and the rationale behind it.

Your options moving forward are to either forcefully assign the value

as Required<AdminDirectory>
presuming that these attributes will always be present (although not ideal), or to raise an issue on the DefinitelyTyped repository for clarification and potential revision of typings for future users.

Answer №2

This specific setup originates from the creation of type declaration files using the generator for advanced services. It is crucial to examine the parser module's Field class, which is responsible for generating interface fields with an optional modifier in its toString method:

toString = (depth: number): string => {
  const indent = " ".repeat(tabWidth * depth);
  let output = "";
  if (this.comment) {
    output += this.comment.toString(depth);
  }
  output += indent + this.name + "?: " + this.typeName + ";\n";
  return output;
};

Any field generated using this will be marked as optional.

A simplified version on the TypeScript playground illustrates the functionality.

I have submitted an issue on the generator repository to seek clarification and explore possible solutions.

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