如何在typescript中获取模板类型的类型名称？

type TypeName<T> = T extends string ? "string" :
                    T extends number ? "number" :
                    T extends boolean ? "boolean" :
                    T extends undefined ? "undefined" :
                    T extends Function ? "function" :
                    "object";

function getTypeName<T>(value: T): TypeName<T> {
  return typeof value as TypeName<T>;
}

const str = "Hello";
const num = 42;
const bool = true;

console.log(getTypeName(str)); // Output: "string"
console.log(getTypeName(num)); // Output: "number"
console.log(getTypeName(bool)); // Output: "boolean"