TypeScript 7.1 Iteration Plan #63703

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1. Daniel Rosenwasser (DanielRosenwasser)

   added

   PlanningIteration plans and roadmappingIteration plans and roadmapping

   on Jul 31, 2026
2. Daniel Rosenwasser (DanielRosenwasser)

   pinned this issue on Jul 31, 2026
3. dasa commented on Jul 31, 2026

   

   Dasa Paddock (dasa)

   on Jul 31, 2026

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   2027, is that a typo?

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4. DanielRosenwasser commented on Jul 31, 2026

   

   Daniel Rosenwasser (DanielRosenwasser)

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   Sure is! 🫠🤦‍♂️

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5. Leonid Meleshin (leon0399)

   marked this as blocking on Aug 21, 2026

   • Revisit full TypeScript 7.x migration once 7.1 ships the compiler API leon0399/llame#229
6. Jan Potoms (Janpot)

   added 2 commits that reference this issue on Aug 24, 2026

   [core] Depend on @typescript/typescript6 instead of pinning

   ...

   c51ea3b

   [core] Depend on @typescript/typescript6 instead of pinning

   ...

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7. DanielRosenwasser commented on Sep 1, 2026

   

   Daniel Rosenwasser (DanielRosenwasser)

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   For anyone following along - we're thinking we want a bit more time to make sure we get testing on the API, and we don't want a lot of churn following the beta. So we are looking at pushing out the beta about 2 weeks further. Details to come on what that means for the RC and final release dates too.

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8. Flarette commented on Sep 3, 2026

   

   Flarette (Flarette)

   on Sep 3, 2026

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   Glad to see all the performance improvements!
   Speaking of which, does the team plan to revisit the instantiation depth limits and similar errors in the tsgo compiler? These numbers were chosen arbitrarily for the tsc performance target and the original reasoning is no longer applicable.

   if c.instantiationDepth == 100 || c.instantiationCount >= 5_000_000 {
       // ...
       c.error(... Type_instantiation_is_excessively_deep_and_possibly_infinite)
   }
   

   The ecosystem has been moving to ever increasing instantiation count in the pursuit of the e2e type safety. With StandartShema validation libraries like zod providing the foundation and typed api clients\metaframeworks extending the chain all the way to the frontend. Once generics\discriminants are thrown into the mix there are legitimate cases where old limits become a bottleneck.
9. jakebailey commented on Sep 3, 2026

   

   Jake Bailey (jakebailey)

   on Sep 3, 2026

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   We have no plans to change these limits. It would be a shame to make the compiler fast only to increase depths and go slow again.

   See also: microsoft/typescript-go#1637

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10. Flarette commented on Sep 3, 2026

    

    Flarette (Flarette)

    on Sep 3, 2026

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    We have no plans to change these limits. It would be a shame to make the compiler fast only to increase depths and go slow again.

    See also: microsoft/typescript-go#1637

    The Jevons paradox is phenomenon when technological improvements that increase the efficiency of a resource's use lead to a rise, rather than a fall, in total consumption of that resource

    This has always been the trajectory of the compute innovation. We don't use improved efficiency just to run our Nokia's for a year on a single charge, we run liquid glass instead.

    The old limits don't make deep instantiation run faster, they just prevent it from running at all! Considering that the rise of limits doesn't even impact projects that don't cross them, i don't see the reason why it can't be at least a compiler flag.

    This policy reads extremely backwards to the spirit of progress and innovation. Let users decide if they want speed or capability.

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11. RyanCavanaugh commented on Sep 4, 2026

    

    Ryan Cavanaugh (RyanCavanaugh)

    on Sep 4, 2026

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    Let users decide if they want speed or capability.

    Users don't decide how their dependencies' declaration files are written. It's a very bad experience if you install supercool-lib and it wildly misbehaves in unpredictable ways because it depends on extremely deep instantiation, which you then have to turn on everywhere and slow down all your other inference.

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12. RyanCavanaugh commented on Sep 4, 2026

    

    Ryan Cavanaugh (RyanCavanaugh)

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    I should also add - one of the goals of content mappers is that you can move a lot of this hypercomplex meta-programming type inference stuff into a static process that produces a much, much faster static .d.ts file. The projects writing SQL/GraphQL/etc parsers in the type system should be looking into this.

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13. stavalfi-oasis commented on Sep 5, 2026

    

    Stav Alfi (stavalfi-oasis)

    on Sep 5, 2026

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    great work thank you!! are you also planning to fix all memory leaks? latest version gets to 30-40+ GB RAM quite often (from vscode)
14. jakebailey commented on Sep 5, 2026

    

    Jake Bailey (jakebailey)

    on Sep 5, 2026

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    Please file an issue if you have something that reproduces.

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16. DanielRosenwasser commented on Oct 5, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    Due to a lot of infrastructure issues, we'll be at least a few days late on beta.

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17. DanielRosenwasser commented on Oct 14, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1

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18. DanielRosenwasser commented on Oct 14, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    *more loudly and audibly annoyed* I said, TypeScript Bot (@typescript-bot) create release-7.1

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19. DanielRosenwasser commented on Oct 14, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1

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20. DanielRosenwasser commented on Oct 15, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1

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21. typescript-automation commented on Oct 15, 2026

    

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    Starting jobs; this comment will be updated as builds start and complete.

    Command	Status	Results
    create release-7.1	✅ Started

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22. DanielRosenwasser commented on Oct 15, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    Nathan Shively-Sanders (@sandersn) once watched me struggle to write a @typedef tag in JSDoc and said it was like watching a comedy routine. Maybe this is my next bit.

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23. DanielRosenwasser commented on Oct 15, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1
24. DanielRosenwasser commented on Oct 16, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1

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25. typescript-automation commented on Oct 16, 2026

    

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    Starting jobs; this comment will be updated as builds start and complete.

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26. typescript-automation commented on Oct 16, 2026

    

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    Hey, Daniel Rosenwasser (@DanielRosenwasser)! I was unable to create the new release branch.

    Check the logs at: https://github.com/microsoft/TypeScript/actions/runs/38827102383
27. Waldenesque commented on Oct 16, 2026

    

    Waldenesque

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    Try these on. Put these on.

    I'm givin you a choice: either put on these glasses, or start eatin that trash can!

    Put on the glasses. Take a look! Put em on.

    Put the glasses on! Put em on!

    Look! Look at em, they're everywhere!!

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28. DanielRosenwasser commented on Oct 16, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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29. DanielRosenwasser commented on Oct 16, 2026

    

    Daniel Rosenwasser (DanielRosenwasser)

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    TypeScript Bot (@typescript-bot) create release-7.1

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30. typescript-automation commented on Oct 16, 2026

    

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    Starting jobs; this comment will be updated as builds start and complete.

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    create release-7.1	✅ Started