I have some code which was working great with earlier versions of firestore/typescript, but after updating can't see how firestore expects nested objects to be updated with dynamic paths.

It happily accepts a single string literal like this:

// no type error
const keyPath = "paymentHistory.test";
t.update(userRef, {
  [keyPath]: payment,
});

But strangely this results in a complex type error involving AddPrefixToKeys.

// type error
const keyPath = "paymentHistory." + "test";
t.update(userRef, {
  [keyPath]: payment,
});

The paymentHistory property on the User object is defined like this:

paymentHistory: Record<string, Payment>

I am using package versions:

"firebase-admin": "11.10.1",
"firebase-functions": "4.4.1",
"typescript": "5.2.2"

How can I satisfy the types, when the nested key "test" is a variable and not known at build time?

Thanks!