feat: infer_null_optionality config option

[aaronrosenthal]

Description 📖

Add support for generating TypeScript interfaces with null types for optional attributes.

Background 📜

null types are generally more common for APIs because JSON does not serialize undefined.

The Fix 🔨

Added support to specify optionality as one of true, :null, or :undefined_or_null for more flexibility. Also included a infer_null_optionality configuration option (disabled by default for backward compatibility) which will allow the library to determine :null or :undefined_or_null where appropriate based on the SQL schema and the use of conditional attributes.

Screenshots 📷

[aaronrosenthal]

@ElMassimo Wanted to check in to see if this is something you would be interested in merging?

[ElMassimo]

Hi Aaron!

I like this enhancement as it has the potential to improve the accuracy of the generated types.,

I'd like to use it more before committing to this API.

---

I'm not sure about allowing a user to define optional with different values.

I'd be more comfortable if this opt-in behavior globally, using fixed rules such as:

• If the attribute is conditional (if:)
  • If nullable in the db or optional: true, use null | undefined
  • Else, undefined
• Else
  • If nullable in the db or optional: true, use null