jotai 1.6.4+ does not support typescript 4.0

[JLarky]

What happens: useAtom returns the value with type any. Why: declare type Awaited<T> = T extends Promise<infer V> ? Awaited<V> : T; this recursive declaration from useAtom is not supported in ts 4.0 What I have tested: I have ts 4.0 project and I noticed that it stopped building with jotai 1.7 and 1.8 but works in 1.6 I also tested jotai 1.8 on different versions using typescript playground and found that it works in 4.1 and up and doesn't work (i.e. returns any) in 4.0 and down

TS playground link: https://www.typescriptlang.org/play?ts=4.0.5#code/JYWwDg9gTgLgBAbzgQxhEAaOBXAzgUwEE0Q4BfOAMynTgHIArCGZYOgbgChOBjCAO1zwaQ-FADCyHgAt8cALwoSACjp0AlF14ChOAsXQBGaACYFcZeoUA+RJzhw+g+AG0AblkoBdc3iIqRGDFJGXx1ezgAekiHWIA9AH4ItwA6NAAZCAB3YOQCS04yTiA

[dai-shi]

Thanks for reporting. Does v1.6.4 break? https://github.com/pmndrs/jotai/blob/v1.6.4/src/core/useAtomValue.ts#L14 has the recursive definition.

[dai-shi]

https://ci.codesandbox.io/status/pmndrs/jotai/pr/1399 Try "Local Install Instructions" ☝️

[JLarky]

https://ci.codesandbox.io/status/pmndrs/jotai/pr/1399 Try "Local Install Instructions" ☝️

I didn't test it thoroughly but it doesn't seem like it fixed it

-jotai@^1.6.7:                                                                                                                                                
-  version "1.6.7"                                                                                                                                            
-  resolved "https://registry.yarnpkg.com/jotai/-/jotai-1.6.7.tgz#d5bdc747b66e369f1d1e859dad8bcda85acb946f"                                                   
-  integrity sha512-MxAm86FYHm6asU3O1hbTKOWpPMP5oI8zNlgFRpZBB85cX79psF2eRb7ZqdGewOgYUUUKAlzZ+sH0IM7Pea6MkA==                                                  
+"jotai@https://pkg.csb.dev/pmndrs/jotai/commit/d1038b1a/jotai":                                                                                              
+  version "1.8.2"                                                                                                                                            
+  resolved "https://pkg.csb.dev/pmndrs/jotai/commit/d1038b1a/jotai#c3fdb1f7abd48f44dd29d1b39ff5975cbce57657"

[JLarky]

Thanks for reporting. Does v1.6.4 break? https://github.com/pmndrs/jotai/blob/v1.6.4/src/core/useAtomValue.ts#L14 has the recursive definition.

yes, I tested this, on ts 4.0 I see 1.6.3 works fine, and 1.6.4 fails

[dai-shi]

I just tested locally with CRA, and it seems to work fine.

jotai-issue-1398.zip

[JLarky]

yeah, it works for me in some other simpler configurations, but I have monorepo with multiple typescript versions and I'm using microbundle. So it would be hard to make a proper reproduction. We can probably call it "fixed" for a general case though :)

[dai-shi]

yeah, sounds like your env doesn't handle "typeVersions" well. I'll add a commit in #1399, which may ease a workaround on your env.

[dai-shi]

Yay, it's working. jotai-issue-1398-2.zip

[JLarky]

yeah, sounds like your env doesn't handle "typeVersions" well. I'll add a commit in #1399, which may ease a workaround on your env.

Sorry for the confusion. I looked a bit more into it. Both 4.1 fix and 4.5 fix actually worked but I was getting some random error that I mistook for this original useAtom error. So I can confirm that both fixes actually work in ts 4.0. (I might look more into that other error as a separate issue ;) so...)

But I agree that using built-in Awaited is of course a better way moving forward :)