递归简单对象的 TypeScript 类型？

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 SimpleObject type declaration recursively. Is there a way to describe this type?

Answer 1

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 };