jotai/optics.mjs

👻 Next gen state management that will spook you

import { atom } from 'jotai';
import { optic, modify, set, collect, preview, get } from 'optics-ts';

function focusAtom(baseAtom, callback) {
  const focus = callback(optic());
  const derivedAtom = atom(get => {
    const newValue = getValueUsingOptic(focus, get(baseAtom));
    return newValue;
  }, (_, set$1, update) => {
    const newValueProducer = update instanceof Function ? modify(focus)(update) : set(focus)(update);
    set$1(baseAtom, newValueProducer);
  });
  derivedAtom.scope = baseAtom.scope;
  return derivedAtom;
}

const getValueUsingOptic = (focus, bigValue) => {
  if (focus._tag === 'Traversal') {
    const values = collect(focus)(bigValue);
    return values;
  }

  if (focus._tag === 'Prism') {
    const value = preview(focus)(bigValue);
    return value;
  }

  const value = get(focus)(bigValue);
  return value;
};

export { focusAtom };