Allow null | undefined as distinctUntilChanged parameter

[pmoleri]

Description:

The documentation mentions and the code allow for undefined parameter (and null), but the exported types didn't allow it.

Example mentioned in the existing JSDoc:

// We only want the events where it changed hands
const changedHands$ = accountUpdates$.pipe(
  distinctUntilChanged(undefined, update => update.updatedBy)
);

And the code includes a comment where it mentions null is also allowed:

// We've been allowing `null` do be passed as the `compare`, so we can't do
// a default value for the parameter, because that will only work
// for `undefined`.
comparator = comparator ?? defaultCompare;

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☁️ Nx Cloud last updated this comment at 2025-11-11 14:07:03 UTC