What is the best way to create a Typescript type consisting of only the public members of a different type?

Inside the realm of Typescript 4.3.5

In what manner can I establish a type that consists solely of the public members and properties of another type? Take into account:

class Thing {
  public name: string
  private secret: string

  public greet(): string {}
  private curse(): string {}
}

My goal now is to create this specific type:

type PublicProps<Thing> = {
  name: string
  greet(): string
}

How can I turn this into a generic structure?

type PublicProps<T> = ?

Answer №1

I utilized a standard form:

type PublicInterface<T> = { [key in keyof T]: T[key] };

For instance, if we consider PublicInterface<Thing>, it would only include the name and greet() members.

The reason this works is because keyof T reveals solely the public members of T.


Credit for this solution goes to Alex Chashin's comment on Stack Overflow. I stumbled upon this while exploring this concept.

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