How to pass an enum in moveCall in TypeScript SDK

SDK
1

In contract, I have

enum MyEnum {
  Foo, Bar
}

and I want receive an instance of this in a public function (I have no idea which is the correct method signature)

public fun my_fun(e: MyEnum) { ... }
or
public fun my_fun(bs: vector<u8>) { ... }

In TypeScript, I can have a schema definition for this enum

const enumSchema = bcs.enum('MyEnum', {
  a: null
  b: null
};

Then what’s the correct way to put serialize {a: null} | {b: null} and use it as an argument in moveCall?

Any help is appreciated!