alistair/dist/atoms/index.js

import { useEvent } from '../chunk-UCYEPI4U.js';
import { useSyncExternalStore, useEffect, useCallback } from 'react';

// Copyright 2025 Alistair Smith https://github.com/alii/alistair
function atom(initialValue) {
  let state = initialValue === undefined ? { initialized: false } : { initialized: true, value: initialValue };
  const subscriptions = /* @__PURE__ */ new Set();
  const get = () => {
    if (!state.initialized) {
      throw new Error("Cannot read an atom that is uninitialized");
    }
    return state.value;
  };
  const notify = (value) => {
    for (const notify2 of subscriptions) {
      notify2(value);
    }
  };
  const set = (next) => {
    const current = get();
    const resolved = next instanceof Function ? next(current) : next;
    if (Object.is(resolved, current)) {
      return;
    }
    state = { initialized: true, value: resolved };
    notify(resolved);
  };
  return {
    get,
    set,
    subscribe: (callback) => {
      subscriptions.add(callback);
      return () => {
        subscriptions.delete(callback);
      };
    }
  };
}
function writable(init, toAction) {
  const a = atom(init);
  return {
    get: a.get,
    set: (next) => {
      a.set(toAction(next));
    },
    subscribe: a.subscribe
  };
}
function useAtomValue(atom2) {
  return useSyncExternalStore(atom2.subscribe, atom2.get, atom2.get);
}
function useAtom(atom2) {
  return [useAtomValue(atom2), atom2.set];
}
function useAtomDidChange(atom2, callback) {
  const stable = useEvent(callback);
  useEffect(() => atom2.subscribe((value) => stable(value)), [atom2]);
}
function useSelectAtomValue(atom2, selector, dependencies = []) {
  const subscribe = useCallback(
    (notify) => atom2.subscribe(notify),
    [atom2, ...dependencies]
  );
  const getSnapshot = () => selector(atom2.get());
  return useSyncExternalStore(subscribe, getSnapshot, getSnapshot);
}

export { atom, useAtom, useAtomDidChange, useAtomValue, useSelectAtomValue, writable };