Mentioning in TypeScript 3.5, whether direct or indirect

Working with the mobx-state-tree library, I've encountered some complex TypeScript declarations that are proving difficult for me to understand.

It appears that there was a change between TS 3.4 and 3.5 that triggered an unexpected issue.

https://i.sstatic.net/mKkfC.png

To demonstrate the problem, I have created a minimal reproduction in a repository: https://github.com/FredyC/mobx-state-tree-ts3.5

I realize this is likely a very specific problem that will require thorough investigation. I would be grateful for any guidance on what changes in TS 3.5 might be causing such an issue.

Update

After following the advice in this answer , I adjusted the example in a repo and encountered a similar error. It seems that mobx-state-tree may be exploiting a bug in TS that was fixed in version 3.5, resulting in these disruptions.

https://i.sstatic.net/B6X7m.png

Answer №1

After taking a closer look at your code snippet, it seems like the issue might stem from the get root() method in BaseModel.ts referencing itself in its return value. To resolve this, you'll need to specify a type for it by updating the syntax to get root(): TRootModel. Once this adjustment is made, your project should compile without any issues.

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