Type to remove methods from interface in Typescript

remove-methods-from-interface.ts

interface Base {
  a: unknown;
  b: unknown;
  c: unknown;

  foo(): unknown;
  bar(): unknown;
}

type RemoveMethods<T> = { [P in keyof T as T[P] extends (...args: any) => any ? never : P]: T[P] }

interface A extends RemoveMethods<Base> {
  thing: unknown;
}

declare const foo: A;
foo.a // good
foo.foo(); // bad