i need to exclude or pick some fields from an object just like how Pick and Omit works with types so i implemented pick function like below but i had a hard time implementing an exclude function because the ts compiler throw the error No index signature with a parameter of type 'string' was found on type 'Omit<T, keyof T>' i also tried to search for a solution online but each time i see the result for the Omit type.
here is the pick function works perfectly, a better approach is welcome:

export function pick<T extends Object>(
  obj: T,
  ...s: [keyof T]
): Pick<T, keyof T> {
  const returnValue = {} as Pick<T, keyof T>;
  s.forEach((k) => {
    returnValue[k] = obj[k];
  });
  return returnValue;
}

exclude function where i got compile errors on line returnValue[e[0]] = obj[e[0]] i expected this to work fine but seems like i don’t understand something, what i am missing here?

export function exclude<T extends Object>(
  obj: T,
  ...s: [keyof T]
): Omit<T, keyof T> {
  const returnValue = {} as Omit<T, keyof T>;
  Object.entries(obj).forEach((e) => {
    if (!s.includes(e[0] as keyof T))
      returnValue[e[0]] = obj[e[0]]
  });

  return returnValue;
}

i tried looking online for casting string to keyof object but can find nothing.