jotai/system/vanilla.development.js

System.register([], (function (exports) {
  'use strict';
  return {
    execute: (function () {

      exports('atom', atom);

      let keyCount = 0;
      function atom(read, write) {
        const key = `atom${++keyCount}`;
        const config = {
          toString: () => key
        };
        if (typeof read === "function") {
          config.read = read;
        } else {
          config.init = read;
          config.read = function(get) {
            return get(this);
          };
          config.write = function(get, set, arg) {
            return set(
              this,
              typeof arg === "function" ? arg(get(this)) : arg
            );
          };
        }
        if (write) {
          config.write = write;
        }
        return config;
      }

      const hasInitialValue = (atom) => "init" in atom;
      const isActuallyWritableAtom = (atom) => !!atom.write;
      const cancelPromiseMap = /* @__PURE__ */ new WeakMap();
      const registerCancelPromise = (promise, cancel) => {
        cancelPromiseMap.set(promise, cancel);
        promise.catch(() => {
        }).finally(() => cancelPromiseMap.delete(promise));
      };
      const cancelPromise = (promise, next) => {
        const cancel = cancelPromiseMap.get(promise);
        if (cancel) {
          cancelPromiseMap.delete(promise);
          cancel(next);
        }
      };
      const resolvePromise = (promise, value) => {
        promise.status = "fulfilled";
        promise.value = value;
      };
      const rejectPromise = (promise, e) => {
        promise.status = "rejected";
        promise.reason = e;
      };
      const isPromiseLike = (x) => typeof (x == null ? void 0 : x.then) === "function";
      const isEqualAtomValue = (a, b) => !!a && "v" in a && "v" in b && Object.is(a.v, b.v);
      const isEqualAtomError = (a, b) => !!a && "e" in a && "e" in b && Object.is(a.e, b.e);
      const hasPromiseAtomValue = (a) => !!a && "v" in a && a.v instanceof Promise;
      const isEqualPromiseAtomValue = (a, b) => "v" in a && "v" in b && a.v.orig && a.v.orig === b.v.orig;
      const returnAtomValue = (atomState) => {
        if ("e" in atomState) {
          throw atomState.e;
        }
        return atomState.v;
      };
      const createStore = exports('createStore', () => {
        const atomStateMap = /* @__PURE__ */ new WeakMap();
        const mountedMap = /* @__PURE__ */ new WeakMap();
        const pendingMap = /* @__PURE__ */ new Map();
        let storeListenersRev2;
        let mountedAtoms;
        {
          storeListenersRev2 = /* @__PURE__ */ new Set();
          mountedAtoms = /* @__PURE__ */ new Set();
        }
        const getAtomState = (atom) => atomStateMap.get(atom);
        const setAtomState = (atom, atomState) => {
          {
            Object.freeze(atomState);
          }
          const prevAtomState = atomStateMap.get(atom);
          atomStateMap.set(atom, atomState);
          if (!pendingMap.has(atom)) {
            pendingMap.set(atom, prevAtomState);
          }
          if (hasPromiseAtomValue(prevAtomState)) {
            const next = "v" in atomState ? atomState.v instanceof Promise ? atomState.v : Promise.resolve(atomState.v) : Promise.reject(atomState.e);
            if (prevAtomState.v !== next) {
              cancelPromise(prevAtomState.v, next);
            }
          }
        };
        const updateDependencies = (atom, nextAtomState, nextDependencies) => {
          const dependencies = /* @__PURE__ */ new Map();
          let changed = false;
          nextDependencies.forEach((aState, a) => {
            if (!aState && a === atom) {
              aState = nextAtomState;
            }
            if (aState) {
              dependencies.set(a, aState);
              if (nextAtomState.d.get(a) !== aState) {
                changed = true;
              }
            } else {
              console.warn("[Bug] atom state not found");
            }
          });
          if (changed || nextAtomState.d.size !== dependencies.size) {
            nextAtomState.d = dependencies;
          }
        };
        const setAtomValue = (atom, value, nextDependencies) => {
          const prevAtomState = getAtomState(atom);
          const nextAtomState = {
            d: (prevAtomState == null ? void 0 : prevAtomState.d) || /* @__PURE__ */ new Map(),
            v: value
          };
          if (nextDependencies) {
            updateDependencies(atom, nextAtomState, nextDependencies);
          }
          if (isEqualAtomValue(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
            return prevAtomState;
          }
          if (hasPromiseAtomValue(prevAtomState) && hasPromiseAtomValue(nextAtomState) && isEqualPromiseAtomValue(prevAtomState, nextAtomState)) {
            if (prevAtomState.d === nextAtomState.d) {
              return prevAtomState;
            } else {
              nextAtomState.v = prevAtomState.v;
            }
          }
          setAtomState(atom, nextAtomState);
          return nextAtomState;
        };
        const setAtomValueOrPromise = (atom, valueOrPromise, nextDependencies, abortPromise) => {
          if (isPromiseLike(valueOrPromise)) {
            let continuePromise;
            const updatePromiseDependencies = () => {
              const prevAtomState = getAtomState(atom);
              if (!hasPromiseAtomValue(prevAtomState) || prevAtomState.v !== promise) {
                return;
              }
              const nextAtomState = setAtomValue(
                atom,
                promise,
                nextDependencies
              );
              if (mountedMap.has(atom) && prevAtomState.d !== nextAtomState.d) {
                mountDependencies(atom, nextAtomState, prevAtomState.d);
              }
            };
            const promise = new Promise((resolve, reject) => {
              let settled = false;
              valueOrPromise.then(
                (v) => {
                  if (!settled) {
                    settled = true;
                    resolvePromise(promise, v);
                    resolve(v);
                    updatePromiseDependencies();
                  }
                },
                (e) => {
                  if (!settled) {
                    settled = true;
                    rejectPromise(promise, e);
                    reject(e);
                    updatePromiseDependencies();
                  }
                }
              );
              continuePromise = (next) => {
                if (!settled) {
                  settled = true;
                  next.then(
                    (v) => resolvePromise(promise, v),
                    (e) => rejectPromise(promise, e)
                  );
                  resolve(next);
                }
              };
            });
            promise.orig = valueOrPromise;
            promise.status = "pending";
            registerCancelPromise(promise, (next) => {
              if (next) {
                continuePromise(next);
              }
              abortPromise == null ? void 0 : abortPromise();
            });
            return setAtomValue(atom, promise, nextDependencies);
          }
          return setAtomValue(atom, valueOrPromise, nextDependencies);
        };
        const setAtomError = (atom, error, nextDependencies) => {
          const prevAtomState = getAtomState(atom);
          const nextAtomState = {
            d: (prevAtomState == null ? void 0 : prevAtomState.d) || /* @__PURE__ */ new Map(),
            e: error
          };
          if (nextDependencies) {
            updateDependencies(atom, nextAtomState, nextDependencies);
          }
          if (isEqualAtomError(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
            return prevAtomState;
          }
          setAtomState(atom, nextAtomState);
          return nextAtomState;
        };
        const readAtomState = (atom, force) => {
          const atomState = getAtomState(atom);
          if (!force && atomState) {
            if (mountedMap.has(atom)) {
              return atomState;
            }
            if (Array.from(atomState.d).every(([a, s]) => {
              if (a === atom) {
                return true;
              }
              const aState = readAtomState(a);
              return aState === s || isEqualAtomValue(aState, s);
            })) {
              return atomState;
            }
          }
          const nextDependencies = /* @__PURE__ */ new Map();
          let isSync = true;
          const getter = (a) => {
            if (a === atom) {
              const aState2 = getAtomState(a);
              if (aState2) {
                nextDependencies.set(a, aState2);
                return returnAtomValue(aState2);
              }
              if (hasInitialValue(a)) {
                nextDependencies.set(a, void 0);
                return a.init;
              }
              throw new Error("no atom init");
            }
            const aState = readAtomState(a);
            nextDependencies.set(a, aState);
            return returnAtomValue(aState);
          };
          let controller;
          let setSelf;
          const options = {
            get signal() {
              if (!controller) {
                controller = new AbortController();
              }
              return controller.signal;
            },
            get setSelf() {
              if (!isActuallyWritableAtom(atom)) {
                console.warn("setSelf function cannot be used with read-only atom");
              }
              if (!setSelf && isActuallyWritableAtom(atom)) {
                setSelf = (...args) => {
                  if (isSync) {
                    console.warn("setSelf function cannot be called in sync");
                  }
                  if (!isSync) {
                    return writeAtom(atom, ...args);
                  }
                };
              }
              return setSelf;
            }
          };
          try {
            const valueOrPromise = atom.read(getter, options);
            return setAtomValueOrPromise(
              atom,
              valueOrPromise,
              nextDependencies,
              () => controller == null ? void 0 : controller.abort()
            );
          } catch (error) {
            return setAtomError(atom, error, nextDependencies);
          } finally {
            isSync = false;
          }
        };
        const readAtom = (atom) => returnAtomValue(readAtomState(atom));
        const addAtom = (atom) => {
          let mounted = mountedMap.get(atom);
          if (!mounted) {
            mounted = mountAtom(atom);
          }
          return mounted;
        };
        const canUnmountAtom = (atom, mounted) => !mounted.l.size && (!mounted.t.size || mounted.t.size === 1 && mounted.t.has(atom));
        const delAtom = (atom) => {
          const mounted = mountedMap.get(atom);
          if (mounted && canUnmountAtom(atom, mounted)) {
            unmountAtom(atom);
          }
        };
        const recomputeDependents = (atom) => {
          const dependencyMap = /* @__PURE__ */ new Map();
          const dirtyMap = /* @__PURE__ */ new WeakMap();
          const getDependents = (a) => {
            var _a;
            const dependents = new Set((_a = mountedMap.get(a)) == null ? void 0 : _a.t);
            pendingMap.forEach((_, pendingAtom) => {
              var _a2;
              if ((_a2 = getAtomState(pendingAtom)) == null ? void 0 : _a2.d.has(a)) {
                dependents.add(pendingAtom);
              }
            });
            return dependents;
          };
          const loop1 = (a) => {
            getDependents(a).forEach((dependent) => {
              if (dependent !== a) {
                dependencyMap.set(
                  dependent,
                  (dependencyMap.get(dependent) || /* @__PURE__ */ new Set()).add(a)
                );
                dirtyMap.set(dependent, (dirtyMap.get(dependent) || 0) + 1);
                loop1(dependent);
              }
            });
          };
          loop1(atom);
          const loop2 = (a) => {
            getDependents(a).forEach((dependent) => {
              var _a;
              if (dependent !== a) {
                let dirtyCount = dirtyMap.get(dependent);
                if (dirtyCount) {
                  dirtyMap.set(dependent, --dirtyCount);
                }
                if (!dirtyCount) {
                  let isChanged = !!((_a = dependencyMap.get(dependent)) == null ? void 0 : _a.size);
                  if (isChanged) {
                    const prevAtomState = getAtomState(dependent);
                    const nextAtomState = readAtomState(dependent, true);
                    isChanged = !isEqualAtomValue(prevAtomState, nextAtomState);
                  }
                  if (!isChanged) {
                    dependencyMap.forEach((s) => s.delete(dependent));
                  }
                }
                loop2(dependent);
              }
            });
          };
          loop2(atom);
        };
        const writeAtomState = (atom, ...args) => {
          let isSync = true;
          const getter = (a) => returnAtomValue(readAtomState(a));
          const setter = (a, ...args2) => {
            let r;
            if (a === atom) {
              if (!hasInitialValue(a)) {
                throw new Error("atom not writable");
              }
              const prevAtomState = getAtomState(a);
              const nextAtomState = setAtomValueOrPromise(a, args2[0]);
              if (!isEqualAtomValue(prevAtomState, nextAtomState)) {
                recomputeDependents(a);
              }
            } else {
              r = writeAtomState(a, ...args2);
            }
            if (!isSync) {
              const flushed = flushPending();
              {
                storeListenersRev2.forEach(
                  (l) => l({ type: "async-write", flushed })
                );
              }
            }
            return r;
          };
          const result = atom.write(getter, setter, ...args);
          isSync = false;
          return result;
        };
        const writeAtom = (atom, ...args) => {
          const result = writeAtomState(atom, ...args);
          const flushed = flushPending();
          {
            storeListenersRev2.forEach(
              (l) => l({ type: "write", flushed })
            );
          }
          return result;
        };
        const mountAtom = (atom, initialDependent, onMountQueue) => {
          var _a;
          const queue = onMountQueue || [];
          (_a = getAtomState(atom)) == null ? void 0 : _a.d.forEach((_, a) => {
            const aMounted = mountedMap.get(a);
            if (aMounted) {
              aMounted.t.add(atom);
            } else {
              if (a !== atom) {
                mountAtom(a, atom, queue);
              }
            }
          });
          readAtomState(atom);
          const mounted = {
            t: new Set(initialDependent && [initialDependent]),
            l: /* @__PURE__ */ new Set()
          };
          mountedMap.set(atom, mounted);
          {
            mountedAtoms.add(atom);
          }
          if (isActuallyWritableAtom(atom) && atom.onMount) {
            const { onMount } = atom;
            queue.push(() => {
              const onUnmount = onMount((...args) => writeAtom(atom, ...args));
              if (onUnmount) {
                mounted.u = onUnmount;
              }
            });
          }
          if (!onMountQueue) {
            queue.forEach((f) => f());
          }
          return mounted;
        };
        const unmountAtom = (atom) => {
          var _a;
          const onUnmount = (_a = mountedMap.get(atom)) == null ? void 0 : _a.u;
          if (onUnmount) {
            onUnmount();
          }
          mountedMap.delete(atom);
          {
            mountedAtoms.delete(atom);
          }
          const atomState = getAtomState(atom);
          if (atomState) {
            if (hasPromiseAtomValue(atomState)) {
              cancelPromise(atomState.v);
            }
            atomState.d.forEach((_, a) => {
              if (a !== atom) {
                const mounted = mountedMap.get(a);
                if (mounted) {
                  mounted.t.delete(atom);
                  if (canUnmountAtom(a, mounted)) {
                    unmountAtom(a);
                  }
                }
              }
            });
          } else {
            console.warn("[Bug] could not find atom state to unmount", atom);
          }
        };
        const mountDependencies = (atom, atomState, prevDependencies) => {
          const depSet = new Set(atomState.d.keys());
          prevDependencies == null ? void 0 : prevDependencies.forEach((_, a) => {
            if (depSet.has(a)) {
              depSet.delete(a);
              return;
            }
            const mounted = mountedMap.get(a);
            if (mounted) {
              mounted.t.delete(atom);
              if (canUnmountAtom(a, mounted)) {
                unmountAtom(a);
              }
            }
          });
          depSet.forEach((a) => {
            const mounted = mountedMap.get(a);
            if (mounted) {
              mounted.t.add(atom);
            } else if (mountedMap.has(atom)) {
              mountAtom(a, atom);
            }
          });
        };
        const flushPending = () => {
          let flushed;
          {
            flushed = /* @__PURE__ */ new Set();
          }
          while (pendingMap.size) {
            const pending = Array.from(pendingMap);
            pendingMap.clear();
            pending.forEach(([atom, prevAtomState]) => {
              const atomState = getAtomState(atom);
              if (atomState) {
                const mounted = mountedMap.get(atom);
                if (mounted && atomState.d !== (prevAtomState == null ? void 0 : prevAtomState.d)) {
                  mountDependencies(atom, atomState, prevAtomState == null ? void 0 : prevAtomState.d);
                }
                if (mounted && !// TODO This seems pretty hacky. Hope to fix it.
                // Maybe we could `mountDependencies` in `setAtomState`?
                (!hasPromiseAtomValue(prevAtomState) && (isEqualAtomValue(prevAtomState, atomState) || isEqualAtomError(prevAtomState, atomState)))) {
                  mounted.l.forEach((listener) => listener());
                  {
                    flushed.add(atom);
                  }
                }
              } else {
                console.warn("[Bug] no atom state to flush");
              }
            });
          }
          {
            return flushed;
          }
        };
        const subscribeAtom = (atom, listener) => {
          const mounted = addAtom(atom);
          const flushed = flushPending();
          const listeners = mounted.l;
          listeners.add(listener);
          {
            storeListenersRev2.forEach(
              (l) => l({ type: "sub", flushed })
            );
          }
          return () => {
            listeners.delete(listener);
            delAtom(atom);
            {
              storeListenersRev2.forEach((l) => l({ type: "unsub" }));
            }
          };
        };
        {
          return {
            get: readAtom,
            set: writeAtom,
            sub: subscribeAtom,
            // store dev methods (these are tentative and subject to change without notice)
            dev_subscribe_store: (l, rev) => {
              if (rev !== 2) {
                throw new Error("The current StoreListener revision is 2.");
              }
              storeListenersRev2.add(l);
              return () => {
                storeListenersRev2.delete(l);
              };
            },
            dev_get_mounted_atoms: () => mountedAtoms.values(),
            dev_get_atom_state: (a) => atomStateMap.get(a),
            dev_get_mounted: (a) => mountedMap.get(a),
            dev_restore_atoms: (values) => {
              for (const [atom, valueOrPromise] of values) {
                if (hasInitialValue(atom)) {
                  setAtomValueOrPromise(atom, valueOrPromise);
                  recomputeDependents(atom);
                }
              }
              const flushed = flushPending();
              storeListenersRev2.forEach(
                (l) => l({ type: "restore", flushed })
              );
            }
          };
        }
      });
      let defaultStore;
      {
        if (typeof globalThis.__NUMBER_OF_JOTAI_INSTANCES__ === "number") {
          ++globalThis.__NUMBER_OF_JOTAI_INSTANCES__;
        } else {
          globalThis.__NUMBER_OF_JOTAI_INSTANCES__ = 1;
        }
      }
      const getDefaultStore = exports('getDefaultStore', () => {
        if (!defaultStore) {
          if (globalThis.__NUMBER_OF_JOTAI_INSTANCES__ !== 1) {
            console.warn(
              "Detected multiple Jotai instances. It may cause unexpected behavior with the default store. https://github.com/pmndrs/jotai/discussions/2044"
            );
          }
          defaultStore = createStore();
        }
        return defaultStore;
      });

    })
  };
}));