Enum question in react/typescript

[cyzeng-Luca]

TypeScript Version: ^3.5.1

Question :

There are three examples about enums like one, two, three. And I call function respond with different param. The second result puzzles me. I think TS will check type like the first example and tell me the problem.（Argument of type '"test"' is not assignable to parameter of type 'Response'.ts）The number 9 is not exit in Response but it not throw errors! How to ensure the type safety ? (I mean the respond params have to be number which include in the enum Response not 9 or others)
Code

const enum Response {
  No = 0,
  Yes = 1
}

function respond(message: Response): void {
  console.log(message);
}

// one
respond("test");
// two
respond(9);
// three
respond(Response.Yes);

Expected behavior:
The respond params have to be number which include in the enum Response and TS tell me how to fix it.

Actual behavior:
The example two doesn't throw error;

any: I just ask for stack overflow, but the effect is not good;
link: https://stackoverflow.com/questions/56849551/how-to-use-enum-in-react-typescript?answertab=active#tab-top

[fatcerberus]

Any enum with only numeric values is mostly just an alias for number in practice--you can assign values that aren't in the enum. The reason for this is that enums are often used as bitfields, so it needs to be able to represent stuff like e.g. Flags.A | Flags.B | Flags.C.

If you want a more typesafe enum, you can try using string values instead of numbers.

[cyzeng-Luca]

Thanks, it works on me.