TypeScript type for recursive simple object?

Question

I'm trying to build a type to describe a "simple object", which is an object which contains only primitive types, other objects and arrays which also only contain primitive types... or other objects and arrays, etc etc

type Primitive = string | number | boolean
type SimpleArray = Array<Primitive | SimpleObject | SimpleArray>
type SimpleObject = Record<string, Primitive | SimpleObject | SimpleArray>

However I am being told that I cannot use the SimpleObjecttype declaration recursively. Is there a way to describe this type?

Aleksey L. · Accepted Answer · 2020-03-27 07:09:25Z

2

You can fix this by replacing Record<string, ...> with { [key: string]: ... } (which is basically the same):

type SimpleObject = { [k: string]:  Primitive | SimpleObject | SimpleArray }

By the way, you can simplify all the above to:

type SimpleObject = string | number | boolean | SimpleObject[] | { [key: string]: SimpleObject };

answered Mar 27, 2020 at 7:09

Aleksey L.

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