Can I import selectors` { get, set } functions directly?

[schmidlidev]

Selectors expose get and set by passing them as parameters to your selectors` functions. Are these functions exposed by the Recoil package in any other way?

I have somewhat complex interdependent state. I have some writeable selectors that read from and write to many other atoms. I would like to extract out some of this logic for re-use. For example, from within several of my selector's set: functions, I want to call the same doAction() function.

Trivially, I can have my re-useable function accept {get, set} in its parameters, and just forward the references from within the selector:

import { GetRecoilValue, SetRecoilState } from 'recoil';

interface Opts {
  get: GetRecoilValue,
  set: SetRecoilState
}

// Extracted and re-usable function:
function doAction({get, set}: Opts, someParam: number) {
  // Do some action using get/set on other atoms.
}

// Example use:
const mySelector = selector({
  key: 'mySelector',
  set: ({get, set}, newValue) => {
    // Some logic
    const something = doAction({get, set}, 12345) // Using the action 
    // Some more logic
  }
})

But it would just be cleaner if my extracted function could simply import get and set from Recoil, so that they don't need to be passed in as parameters. Is this possible?

[rbaxter08]

I don't think so, because the get and set wouldn't have access to the store provided by the RecoilRoot. In a way this is basically asking if Recoil can work outside of React, which I don't believe it can.

For what it's worth, your solution seems fine to me. Maybe it would make more sense if doAction was a selector instead of just a function, but would have to see more code.

[drarmstr]

If doAction() is just extracted to normalize redundant code getting/setting atoms, that's fine. But keep in mind that selectors shouldn't do side-effects from their get/set methods.