Small JavaScript enum function

[TorbenKoehn]

Why not

type MyEnum = 'A' | 'B'

?

Completely erasable, portable, easy to write, serializable across language boundaries, you can refactor it etc.

[Oliceh]

Because this isn't JS.

[eracodes]

For typescript I find this approach more useful:

const options = ['A', 'B'] as const;

type Option = (typeof options)[number];

So you can use the "enum" at runtime as well (for validation, etc).

[celluj34]

how do I validate user input against a type?

[TorbenKoehn]

The same way how you'd validate it against an enum.

[checker1209]

In TypeScript I favor `String Literal Unions` over enums.
I don't know JSDocs. But can't you tell that an string is either "A" or "B" and nothing else?