Typescript guard generic

Question

object may be {payload: {name: ''}} or {payload: {age: 11}}, how to declare a function param?

type AnyType<T> = {
    payload: T;
}
type A = {
    name: string;
};
type B = {
    age: number;
};

function getValue(params: AnyType<unknown>) {
    // here error occurred
    if (typeof (params.payload) === A) {
        // log(params.payload.name)
    }

    if (typeof params.payload === B) {
        // log(params.payload.age)
    }
}

How to guard A or B in function?

Playground