Add "auto" to importModuleSpecifierPreference

[andrewbranch]

Fixes #29837

@mjbvz was this all you need? I looked through where this is used, and it already treats any value other than relative or non-relative as auto. I also checked that typescript-language-features already sends the string auto to the server, but maybe I’m missing something.

[typescript-bot]

Thanks for the PR! It looks like you've changed the TSServer protocol in some way. Please ensure that any changes here don't break consumers of the current TSServer API. For some extra review, we'll ping @sheetalkamat, @amcasey, @mjbvz, @minestarks for you. Feel free to loop in other consumers/maintainers if necessary

[minestarks]

@jessetrinity FYI

[andrewbranch]

@minestarks do you want me to add Jesse to the typescript-bot comment? 😁

[minestarks]

@andrewbranch no need - I was pinging @jessetrinity as he has the VS side context on this specific setting

[jessetrinity]

it already treats any value other than relative or non-relative as auto.

I think this wasn't the case when we added auto for quotePreference I recall having to patch up a few holes probably because this implicit auto behavior was not designed for. Is this something we will have to worry about changing down the line (will the empty string continue to be treated as auto everywhere)?