formatDate with week and locale options returns full ISO date instead of "Week #"

[PooSham]

Reduced Test Case

https://codepen.io/poosham/pen/RwOdeOM

Do you understand that if a reduced test case is not provided, we will intentionally delay triaging of your ticket?

• I understand

Which connector are you using (React/Angular/etc)?

No connector (vanilla JS)

Bug Description

If I call formatDate with options week and locale, I expect to get the week number along with the word translated (may vary depending on the value of the week option). However, what I get is the current date formatted with the given locale. For example:

formatDate(new Date(), { week: 'long', locale: 'sv' })

This doesn't result in "Vecka 17" as I would have guessed, but instead I get "2024-04-27".

I've tracked down where things go wrong in the fc code. buildFormattingFunc from formatting-native.ts seems to be the issue here, notably this if-expression:

if (standardDatePropCnt === 0 && extendedSettings.week)

Here, standardDatePropCnt is 1 instead of 0, so we never hit what's inside this if-statement, which is our week formatter.