jotai/system/optics.development.js

👻 Next gen state management that will spook you

System.register(['optics-ts', 'jotai'], (function (exports) {
  'use strict';
  var O, atom;
  return {
    setters: [function (module) {
      O = module;
    }, function (module) {
      atom = module.atom;
    }],
    execute: (function () {

      exports('focusAtom', focusAtom);

      const getWeakCacheItem = (cache, deps) => {
        do {
          const [dep, ...rest] = deps;
          const entry = cache.get(dep);
          if (!entry) {
            return;
          }
          if (!rest.length) {
            return entry[1];
          }
          cache = entry[0];
          deps = rest;
        } while (deps.length);
      };
      const setWeakCacheItem = (cache, deps, item) => {
        do {
          const [dep, ...rest] = deps;
          let entry = cache.get(dep);
          if (!entry) {
            entry = [ new WeakMap()];
            cache.set(dep, entry);
          }
          if (!rest.length) {
            entry[1] = item;
            return;
          }
          cache = entry[0];
          deps = rest;
        } while (deps.length);
      };
      const createMemoizeAtom = () => {
        const cache = /* @__PURE__ */ new WeakMap();
        const memoizeAtom = (createAtom, deps) => {
          const cachedAtom = getWeakCacheItem(cache, deps);
          if (cachedAtom) {
            return cachedAtom;
          }
          const createdAtom = createAtom();
          setWeakCacheItem(cache, deps, createdAtom);
          return createdAtom;
        };
        return memoizeAtom;
      };

      const memoizeAtom = createMemoizeAtom();
      const isFunction = (x) => typeof x === "function";
      function focusAtom(baseAtom, callback) {
        return memoizeAtom(() => {
          const focus = callback(O.optic());
          const derivedAtom = atom((get) => getValueUsingOptic(focus, get(baseAtom)), (get, set, update) => {
            const newValueProducer = isFunction(update) ? O.modify(focus)(update) : O.set(focus)(update);
            return set(baseAtom, newValueProducer(get(baseAtom)));
          });
          return derivedAtom;
        }, [baseAtom, callback]);
      }
      const getValueUsingOptic = (focus, bigValue) => {
        if (focus._tag === "Traversal") {
          const values = O.collect(focus)(bigValue);
          return values;
        }
        if (focus._tag === "Prism") {
          const value2 = O.preview(focus)(bigValue);
          return value2;
        }
        const value = O.get(focus)(bigValue);
        return value;
      };

    })
  };
}));