Repository navigation
[utils] An object type that contains Json causes a recursive error in conjunction with Draft/WritableDraft types from Immer #10205
Description
Activity
Some starting points for tackling the "Type instantiation is excessively deep" error:
- TypeScript feature - Tail call elimination on conditional types with accumulator strategy: https://devblogs.microsoft.com/typescript/announcing-typescript-4-5/#tailrec-conditional
- Accumulator strategy example: https://dev.to/tylim88/typescript-loop-tuple-with-length-1000-4kg
0 extends 1trick for extending tail recursion limit: Tail recursion optimization limit 999 may be manipulated microsoft/TypeScript#49459
This might not be enough to resolve the issue if the mutual recursion depth is infinite even with tail call elimination.
Might be resolved by TypeScript 5.5: microsoft/TypeScript#57293
Reacted by Elliot Winkler and Maarten Zuidhoorn- added a commit that references this issue
on May 29, 2024 - added a commit that references this issue
on Jul 11, 2024 I checked the Immer repo and it looks like this problem still exists: immerjs/immer#839
- added a commit that references this issue
on Sep 2, 2025 - changed the title
[-]An object type that contains `Json` causes a recursive error in conjunction with `Draft`/`WritableDraft` types from Immer[/-][+][utils] An object type that contains `Json` causes a recursive error in conjunction with `Draft`/`WritableDraft` types from Immer[/+]on Sep 11, 2026
If you have an object type such as:
and you use it to change state within an Immer
producecallback — such the callback thatupdatein BaseController v2 takes — then you will get an error:This is happening because
Jsonis a recursive type andDraftandWritableDrafttrampoline as they recurse through thatJsontype. There's an open bug report on the Immer issue tracker with a proposed fix that was eventually reverted.We should work out some way to avoid this.