Conditional type doesn't work inside tuple #40067

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1. jack-williams commented on Aug 15, 2020

   

   Jack Williams (jack-williams)

   on Aug 15, 2020

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   As per #24897, outside of JSDoc the ? modifier is only valid for tuple elements, not arbitrary types. It does not make sense to say that a type can be omitted, only that an element can be omitted.
2. ienzam commented on Aug 18, 2020

   

   Md. Enzam Hossain (ienzam)

   on Aug 18, 2020

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   The above definition is inside a tuple, and one way to look at that is the element can be omitted or not.
   But I guess that messes up in other ways like making sure all the other elements are optional too.
3. Ryan Cavanaugh (RyanCavanaugh)

   added

   Working as IntendedThe behavior described is the intended behavior; this is not a bugThe behavior described is the intended behavior; this is not a bug

   on Sep 3, 2020
4. typescript-bot commented on Sep 5, 2020

   

   TypeScript Bot (typescript-bot)

   on Sep 5, 2020

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   This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.
5. TypeScript Bot (typescript-bot)

   closed this as completedon Sep 5, 2020
6. microsoft

   locked as resolved and limited conversation to collaborators on Oct 21, 2025