使用点表示法的深度方法属性的访问类型

Question

Here's an example of a class with deep methods S .

class Core {
    read = () => true
}

class Customer extends Core {}
class Plan extends Core {}

class S {
    stripeCustomer = new Customer()
    stripePlan = new Plan()

}

type a = ReturnType<Core['read']> // boolean
type b = ReturnType<S['stripeCustomer']['read']> // boolean

This is the syntax I am looking for:

DeepMethodReturnType<A, B>

type c = DeepMethodReturnType<S, 'stripeCustomer.read'>

Is it possible to access the deep methods of a class using dot notation? like stripeCustomer.read ?

Answer 1

Not using dot notation unfortunately. String literals cannot be concatenated or split at the type level therefore this is impossible.

IE This method would rely on splitting the string literal stripeCustomer.read to stripeCustomer and read respectively.

You can however achieve similar syntax with tuples ["stripeCustomer", "read"]