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Comment by pverheggen | Hacker News Reader

Why not use annotation instead?

  const props: ['foo'] = ['foo']

Didn't occur to me, that's certainly more defensible! Though maybe less humorous.

Or: cons foo = [‘foo’] as const;

> In a case like that `as const` doesn't work, since the function doesn't expect a readonly argument.

Ah, missed that. Sorry.

I don’t get this? why do I need to say as const?

`as const` is a special annotation that lets the TypeScript compiler infers the more specific type `["foo"]` instead of `string[]`.

As const creates a typed tuple instead of a typed array