I want to pass an assertion function as a named argument and invoke it. TypeScript complains when I try this:

const myFunc = ({ myAssertionFunc }: { myAssertionFunc: (x: unknown) => asserts x is string }) => {
  myAssertionFunc(1234); // "Assertions require every name in the call target to be declared with an explicit type annotation. ts(2775)"
}

But a positional argument works:

const myFunc = (myAssertionFunc: (x: unknown) => asserts x is string) => {
  myAssertionFunc(1234); // No compile-time problem!
}

Am I doing this incorrectly? Or is this a missing feature in TypeScript?