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 = (get) => get(config);
          config.write = (get, set, arg) => set(
            config,
            typeof arg === "function" ? arg(get(config)) : 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 isEqualAtomValue = (a, b) => "v" in a && "v" in b && Object.is(a.v, b.v);
      const isEqualAtomError = (a, b) => "e" in a && "e" in b && Object.is(a.e, b.e);
      const hasPromiseAtomValue = (a) => "v" in a && a.v instanceof Promise;
      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 stateListeners;
        let mountedAtoms;
        {
          stateListeners = /* @__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 (prevAtomState && hasPromiseAtomValue(prevAtomState)) {
            const next = "v" in atomState ? atomState.v instanceof Promise ? atomState.v : Promise.resolve(atomState.v) : Promise.reject(atomState.e);
            cancelPromise(prevAtomState.v, next);
          }
        };
        const updateDependencies = (atom, nextAtomState, depSet) => {
          const dependencies = /* @__PURE__ */ new Map();
          let changed = false;
          depSet.forEach((a) => {
            const aState = a === atom ? nextAtomState : getAtomState(a);
            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, depSet) => {
          const prevAtomState = getAtomState(atom);
          const nextAtomState = {
            d: (prevAtomState == null ? void 0 : prevAtomState.d) || /* @__PURE__ */ new Map(),
            v: value
          };
          if (depSet) {
            updateDependencies(atom, nextAtomState, depSet);
          }
          if (prevAtomState && isEqualAtomValue(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
            return prevAtomState;
          }
          setAtomState(atom, nextAtomState);
          return nextAtomState;
        };
        const setAtomError = (atom, error, depSet) => {
          const prevAtomState = getAtomState(atom);
          const nextAtomState = {
            d: (prevAtomState == null ? void 0 : prevAtomState.d) || /* @__PURE__ */ new Map(),
            e: error
          };
          if (depSet) {
            updateDependencies(atom, nextAtomState, depSet);
          }
          if (prevAtomState && isEqualAtomError(prevAtomState, nextAtomState) && prevAtomState.d === nextAtomState.d) {
            return prevAtomState;
          }
          setAtomState(atom, nextAtomState);
          return nextAtomState;
        };
        const readAtomState = (atom) => {
          const atomState = getAtomState(atom);
          if (atomState) {
            atomState.d.forEach((_, a) => {
              if (a !== atom && !mountedMap.has(a)) {
                readAtomState(a);
              }
            });
            if (Array.from(atomState.d).every(
              ([a, s]) => a === atom || getAtomState(a) === s
            )) {
              return atomState;
            }
          }
          const depSet = /* @__PURE__ */ new Set();
          let isSync = true;
          const getter = (a) => {
            depSet.add(a);
            if (a === atom) {
              const aState2 = getAtomState(a);
              if (aState2) {
                return returnAtomValue(aState2);
              }
              if (hasInitialValue(a)) {
                return a.init;
              }
              throw new Error("no atom init");
            }
            const aState = readAtomState(a);
            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 value = atom.read(getter, options);
            if (value instanceof Promise) {
              let continuePromise;
              const promise = new Promise((resolve, reject) => {
                let settled = false;
                value.then(
                  (v) => {
                    if (!settled) {
                      resolvePromise(promise, v);
                      resolve(v);
                    }
                  },
                  (e) => {
                    if (!settled) {
                      rejectPromise(promise, e);
                      reject(e);
                    }
                  }
                ).finally(() => {
                  if (!settled) {
                    settled = true;
                    setAtomValue(atom, promise, depSet);
                  }
                });
                continuePromise = (next) => {
                  if (!settled) {
                    settled = true;
                    next.then(
                      (v) => resolvePromise(promise, v),
                      (e) => rejectPromise(promise, e)
                    );
                    resolve(next);
                  }
                };
              });
              promise.status = "pending";
              registerCancelPromise(promise, (next) => {
                if (next) {
                  continuePromise(next);
                }
                controller == null ? void 0 : controller.abort();
              });
              return setAtomValue(atom, promise, depSet);
            }
            return setAtomValue(atom, value, depSet);
          } catch (error) {
            return setAtomError(atom, error, depSet);
          } 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 mounted = mountedMap.get(atom);
          mounted == null ? void 0 : mounted.t.forEach((dependent) => {
            if (dependent !== atom) {
              const prevAtomState = getAtomState(dependent);
              const nextAtomState = readAtomState(dependent);
              if (!prevAtomState || !isEqualAtomValue(prevAtomState, nextAtomState)) {
                recomputeDependents(dependent);
              }
            }
          });
        };
        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 = setAtomValue(a, args2[0]);
              if (!prevAtomState || !isEqualAtomValue(prevAtomState, nextAtomState)) {
                recomputeDependents(a);
              }
            } else {
              r = writeAtomState(a, ...args2);
            }
            if (!isSync) {
              flushPending();
            }
            return r;
          };
          const result = atom.write(getter, setter, ...args);
          isSync = false;
          return result;
        };
        const writeAtom = (atom, ...args) => {
          const result = writeAtomState(atom, ...args);
          flushPending();
          return result;
        };
        const mountAtom = (atom, initialDependent) => {
          const mounted = {
            t: new Set(initialDependent && [initialDependent]),
            l: /* @__PURE__ */ new Set()
          };
          mountedMap.set(atom, mounted);
          {
            mountedAtoms.add(atom);
          }
          readAtomState(atom).d.forEach((_, a) => {
            const aMounted = mountedMap.get(a);
            if (aMounted) {
              aMounted.t.add(atom);
            } else {
              if (a !== atom) {
                mountAtom(a, atom);
              }
            }
          });
          readAtomState(atom);
          if (isActuallyWritableAtom(atom) && atom.onMount) {
            const onUnmount = atom.onMount((...args) => writeAtom(atom, ...args));
            if (onUnmount) {
              mounted.u = onUnmount;
            }
          }
          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 = () => {
          while (pendingMap.size) {
            const pending = Array.from(pendingMap);
            pendingMap.clear();
            pending.forEach(([atom, prevAtomState]) => {
              const atomState = getAtomState(atom);
              if (atomState) {
                if (atomState.d !== (prevAtomState == null ? void 0 : prevAtomState.d)) {
                  mountDependencies(atom, atomState, prevAtomState == null ? void 0 : prevAtomState.d);
                }
                const mounted = mountedMap.get(atom);
                if (mounted && !// TODO This seems pretty hacky. Hope to fix it.
                // Maybe we could `mountDependencies` in `setAtomState`?
                (prevAtomState && !hasPromiseAtomValue(prevAtomState) && (isEqualAtomValue(prevAtomState, atomState) || isEqualAtomError(prevAtomState, atomState)))) {
                  mounted.l.forEach((listener) => listener());
                }
              } else {
                console.warn("[Bug] no atom state to flush");
              }
            });
          }
          {
            stateListeners.forEach((l) => l());
          }
        };
        const subscribeAtom = (atom, listener) => {
          const mounted = addAtom(atom);
          flushPending();
          const listeners = mounted.l;
          listeners.add(listener);
          return () => {
            listeners.delete(listener);
            delAtom(atom);
          };
        };
        {
          return {
            get: readAtom,
            set: writeAtom,
            sub: subscribeAtom,
            // store dev methods (these are tentative and subject to change)
            dev_subscribe_state: (l) => {
              stateListeners.add(l);
              return () => {
                stateListeners.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, value] of values) {
                if (hasInitialValue(atom)) {
                  setAtomValue(atom, value);
                  recomputeDependents(atom);
                }
              }
              flushPending();
            }
          };
        }
      });
      let defaultStore;
      const getDefaultStore = exports('getDefaultStore', () => {
        if (!defaultStore) {
          defaultStore = createStore();
        }
        return defaultStore;
      });

    })
  };
}));