Read-Write atom could not update itself

[LaamGinghong]

Bug Description

I want to update a Read-Write atom, but not work and console report the atom is not writable.

Reproduction Link

https://stackblitz.com/edit/vitejs-vite-fdv7suyz?file=src%2FApp.tsx

[DavidJFelix]

https://stackblitz.com/edit/vitejs-vite-utsmvztt?file=src%2FApp.tsx Here's a solution.

[DavidJFelix]

The solution uses a "primative atom" which is a simple read/write atom that takes a value and simply gives that value back. But the nature of that primative atom is that it stores the value in a store inside the setter (it doesn't call setAtom) and in the getter it gets that value from the store. What you're doing by creating a "Read-Write" atom is you're defining the getAtom configuration and the setAtom configuration. If you call get or set on that atom inside its own functions, it's just calling the function you're already in. By leveraging a different, primative atom (in this case, innerAtom) to store a simple value or null for us, we can decide if we want to rely on the initial default value or instead some manually set value. So yes we call this a "Read-Write atom" but what we actually mean is that its a Readable and Writable DERIVED atom and it derives its read from another primative atom or some outside constant.