Add PartialOnUndefinedDeep type

[clemclx]

Closes #399

[sindresorhus]

Can you explain why you went with a different implementation than what's in https://stackoverflow.com/a/72320731/64949 ? Just curious how they compare and whether it was an intentional choice.

[sindresorhus]

Thanks for contributing. Make sure you read and adhere to: https://github.com/sindresorhus/type-fest/blob/main/.github/contributing.md#submitting-a-new-type

[sindresorhus]

You need to add the type to the readme.

[clemclx]

Can you explain why you went with a different implementation than what's in https://stackoverflow.com/a/72320731/64949 ? Just curious how they compare and whether it was an intentional choice.

Hey,
I ended with a different implementation for some reasons :

• more comprehensive (subjective)
• avoid the intersection with the "subtype" keeping only required props and a Partial of the whole type (imo, it could lead to some weird behavior with some complex types)
• recursion : the solution on StackOverflow could be Deep too, but the intersection type with the Partial would mean that recursion would happen two times (in the first type keeping only non optional props and in the Partial retreating the whole type)

This way, I finally implemented it from scratch as I would have done

[sindresorhus]

Can you come up with some more use-cases?

[clemclx]

i'm not sure to have more use-cases that would be pertinent/understandable for users, let me know if something seems pertinent for you :)

[sindresorhus]

Thanks :)