Would be good to have DeepUndefinable

[ShravanSunder]

See https://github.com/ts-essentials/ts-essentials/tree/master/lib/deep-undefinable

is it ok to put a PR to add something like this?

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[sindresorhus]

Yes, makes sense to have such a type. It should be named UndefinableDeep though.

It should follow the same style as our existing deep types: https://github.com/sindresorhus/type-fest/blob/main/source/readonly-deep.d.ts