Can't autocomplete list of strings when union string | string is present #28743

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1. jack-williams commented on Nov 29, 2018

   

   Jack Williams (jack-williams)

   on Nov 29, 2018

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   Duplicate of #12687

   The union type is simplified into a normal-form via subtype reduction; hovering over ListOrString will only show the supertype string.
2. usernamehw commented on Nov 29, 2018

   

   Alexander (usernamehw)

   on Nov 29, 2018

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   So...

   • it was working at some point
   • it was reported and accepted to be a bug
   • it was given an explanation new is always better

   The type "foo" | "bar" | string is equivalent to the string type and now gets simplified early on. So all we see when querying the type checker for the type of x is string. So, this can't be fixed.

   • the issue got closed and locked so nobody could find it
3. weswigham commented on Nov 30, 2018

   

   Wesley Wigham (weswigham)

   on Nov 30, 2018

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   I've tagged the old issue with a domain label for future use, but it predates when we used domain labels, which is why we didn't have one on it. And most old issues without activity are closed/locked.
4. Wesley Wigham (weswigham)

   added

   DuplicateAn existing issue was already createdAn existing issue was already created

   on Nov 30, 2018
5. usernamehw commented on Nov 30, 2018

   

   Alexander (usernamehw)

   on Nov 30, 2018

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   Can this be implemented as a TS plugin then?

   • Type checking should stay as it is
   • Editor autocomplete should have these items
6. weswigham commented on Nov 30, 2018

   

   Wesley Wigham (weswigham)

   on Nov 30, 2018

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   We don't really have plugins - sans editor-wide ls plugins that wrap the entire ls. They can do anything, since they just wrap and intercept the LS, it's just not always easy.
7. Alexander (usernamehw)

   closed this as completedon Nov 30, 2018
8. typescript-bot commented on Dec 12, 2018

   

   TypeScript Bot (typescript-bot)

   on Dec 12, 2018

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   This issue has been marked as a duplicate and has seen no activity in the last day. It has been closed automatic house-keeping purposes.
9. microsoft

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