Exclude attribute features from a Typescript interface

I need to exclude all functions from an interface

interface Person {
  firstname: string;
  lastname: string;
  walk: () => void;
  speak: (phrase: string) => Promise<void>
}

type PersonWithoutFunctions = RemoveFunctions<Person>

/* desired outcome:

PersonWithoutFunctions {
  firstname: string;
  lastname: string;
}
*/

Answer №1

Here is the code snippet you requested:

type ExcludeFunctions<T> = {
  [K in keyof T as T[K] extends Function ? never : K]: T[K]
}

Playground

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