Recursive mapped types in Typescript

Question

I don't know if this is possible but I'm wondering if you can create recursively mapped types. I don't know if that makes sense so let me try to explain what I'm trying to do.

I'm creating an excel parser that takes in workbook and returns a type T . One of the things I want to do is create a mapped typed that maps every key to a string which will correspond to an excel cell reference in the form of a string (eg 'A5' ).

I can map every key to a string like so:

{[P in keyof T]: string}

but this maps complex types (objects and arrays) to strings too but I'd actually like to map the keys of those complex values to a string too.

Any ideas?

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Edit: I'm starting to think it's not possible because something like this would need to be implemented .

Answer 1

you couldn t before but you can now from Typescript 4.1 version. conditional recursive types are now supported