import type { Atom, WritableAtom } from './atom.js';
type AnyValue = unknown;
type AnyError = unknown;
type AnyAtom = Atom<AnyValue>;
type WithOnMount<Args extends unknown[], Result> = {
    onMount: NonNullable<WritableAtom<AnyValue, Args, Result>['onMount']>;
};
type WithOnInit = {
    INTERNAL_onInit: NonNullable<Atom<AnyValue>['INTERNAL_onInit']>;
};
type OnUnmount = () => void;
type EpochNumber = number;
/**
 * Mutable atom state,
 * tracked for both mounted and unmounted atoms in a store.
 *
 * This should be garbage collectable.
 * We can mutate it during atom read. (except for fields with TODO)
 */
type AtomState<Value = AnyValue> = {
    /**
     * Map of atoms that the atom depends on.
     * The map value is the epoch number of the dependency.
     */
    readonly d: Map<AnyAtom, EpochNumber>;
    /**
     * Set of atoms with pending promise that depend on the atom.
     *
     * This may cause memory leaks, but it's for the capability to continue promises
     * TODO(daishi): revisit how to handle this
     */
    readonly p: Set<AnyAtom>;
    /** The epoch number of the atom. */
    n: EpochNumber;
    /** The store epoch number that last validated the atom. */
    m?: EpochNumber;
    /** Atom value */
    v?: Value;
    /** Atom error */
    e?: AnyError;
};
/**
 * State tracked for mounted atoms. An atom is considered "mounted" if it has a
 * subscriber, or is a transitive dependency of another atom that has a
 * subscriber.
 * The mounted state of an atom is freed once it is no longer mounted.
 */
type Mounted = {
    /** Set of listeners to notify when the atom value changes. */
    readonly l: Set<() => void>;
    /** Set of mounted atoms that the atom depends on. */
    readonly d: Set<AnyAtom>;
    /** Set of mounted atoms that depends on the atom. */
    readonly t: Set<AnyAtom>;
    /** Function to run when the atom is unmounted. */
    u?: () => void;
};
type WeakMapLike<K extends object, V> = {
    get(key: K): V | undefined;
    set(key: K, value: V): void;
    has(key: K): boolean;
    delete(key: K): boolean;
};
type SetLike<T> = {
    readonly size: number;
    add(value: T): void;
    has(value: T): boolean;
    delete(value: T): boolean;
    clear(): void;
    forEach(callback: (value: T) => void): void;
    [Symbol.iterator](): IterableIterator<T>;
};
type AtomStateMap = WeakMapLike<AnyAtom, AtomState>;
type MountedMap = WeakMapLike<AnyAtom, Mounted>;
type InvalidatedAtoms = WeakMapLike<AnyAtom, EpochNumber>;
type ChangedAtoms = SetLike<AnyAtom>;
type Callbacks = SetLike<() => void>;
type AtomRead = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>, ...params: Parameters<Atom<Value>['read']>) => Value;
type AtomWrite = <Value, Args extends unknown[], Result>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: WritableAtom<Value, Args, Result>, ...params: Parameters<WritableAtom<Value, Args, Result>['write']>) => Result;
type AtomOnInit = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value> & WithOnInit) => void;
type AtomOnMount = <Value, Args extends unknown[], Result>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: WritableAtom<Value, Args, Result> & WithOnMount<Args, Result>, setAtom: (...args: Args) => Result) => OnUnmount | void;
type EnsureAtomState = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>) => AtomState<Value>;
type FlushCallbacks = (buildingBlocks: Readonly<BuildingBlocks>, store: Store) => void;
type RecomputeInvalidatedAtoms = (buildingBlocks: Readonly<BuildingBlocks>, store: Store) => void;
type ReadAtomState = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>) => AtomState<Value>;
type InvalidateDependents = (buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: AnyAtom) => void;
type WriteAtomState = <Value, Args extends unknown[], Result>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: WritableAtom<Value, Args, Result>, args: Args) => Result;
type MountDependencies = (buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: AnyAtom) => void;
type MountAtom = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>) => Mounted;
type UnmountAtom = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>) => Mounted | undefined;
type SetAtomStateValueOrPromise = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>, valueOrPromise: Value) => void;
type StoreGet = <Value>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: Atom<Value>) => Value;
type StoreSet = <Value, Args extends unknown[], Result>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: WritableAtom<Value, Args, Result>, ...args: Args) => Result;
type StoreSub = (buildingBlocks: Readonly<BuildingBlocks>, store: Store, atom: AnyAtom, listener: () => void) => () => void;
type EnhanceBuildingBlocks = (buildingBlocks: Readonly<BuildingBlocks>, store: Store) => Readonly<BuildingBlocks>;
type AbortHandlersMap = WeakMapLike<PromiseLike<unknown>, Set<() => void>>;
type RegisterAbortHandler = <T>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, promise: PromiseLike<T>, abortHandler: () => void) => void;
type AbortPromise = <T>(buildingBlocks: Readonly<BuildingBlocks>, store: Store, promise: PromiseLike<T>) => void;
type StoreEpochHolder = [n: EpochNumber];
type Store = {
    get: <Value>(atom: Atom<Value>) => Value;
    set: <Value, Args extends unknown[], Result>(atom: WritableAtom<Value, Args, Result>, ...args: Args) => Result;
    sub: (atom: AnyAtom, listener: () => void) => () => void;
};
declare const KEY_atomStateMap = "a";
declare const KEY_mountedMap = "m";
declare const KEY_invalidatedAtoms = "i";
declare const KEY_changedAtoms = "c";
declare const KEY_mountCallbacks = "q";
declare const KEY_unmountCallbacks = "Q";
declare const KEY_storeHooks = "h";
declare const KEY_atomRead = "R";
declare const KEY_atomWrite = "W";
declare const KEY_atomOnInit = "I";
declare const KEY_atomOnMount = "M";
declare const KEY_ensureAtomState = "e";
declare const KEY_flushCallbacks = "f";
declare const KEY_recomputeInvalidatedAtoms = "C";
declare const KEY_readAtomState = "r";
declare const KEY_invalidateDependents = "d";
declare const KEY_writeAtomState = "w";
declare const KEY_mountDependencies = "D";
declare const KEY_mountAtom = "t";
declare const KEY_unmountAtom = "T";
declare const KEY_setAtomStateValueOrPromise = "v";
declare const KEY_storeGet = "g";
declare const KEY_storeSet = "s";
declare const KEY_storeSub = "b";
declare const KEY_enhanceBuildingBlocks = "B";
declare const KEY_abortHandlersMap = "p";
declare const KEY_registerAbortHandler = "H";
declare const KEY_abortPromise = "A";
declare const KEY_storeEpochHolder = "E";
type BuildingBlocks = {
    [KEY_atomStateMap]: AtomStateMap;
    [KEY_mountedMap]: MountedMap;
    [KEY_invalidatedAtoms]: InvalidatedAtoms;
    [KEY_changedAtoms]: ChangedAtoms;
    [KEY_mountCallbacks]: Callbacks;
    [KEY_unmountCallbacks]: Callbacks;
    [KEY_storeHooks]: StoreHooks;
    [KEY_atomRead]: AtomRead;
    [KEY_atomWrite]: AtomWrite;
    [KEY_atomOnInit]: AtomOnInit;
    [KEY_atomOnMount]: AtomOnMount;
    [KEY_ensureAtomState]: EnsureAtomState;
    [KEY_flushCallbacks]: FlushCallbacks;
    [KEY_recomputeInvalidatedAtoms]: RecomputeInvalidatedAtoms;
    [KEY_readAtomState]: ReadAtomState;
    [KEY_invalidateDependents]: InvalidateDependents;
    [KEY_writeAtomState]: WriteAtomState;
    [KEY_mountDependencies]: MountDependencies;
    [KEY_mountAtom]: MountAtom;
    [KEY_unmountAtom]: UnmountAtom;
    [KEY_setAtomStateValueOrPromise]: SetAtomStateValueOrPromise;
    [KEY_storeGet]: StoreGet;
    [KEY_storeSet]: StoreSet;
    [KEY_storeSub]: StoreSub;
    [KEY_enhanceBuildingBlocks]: EnhanceBuildingBlocks | undefined;
    [KEY_abortHandlersMap]: AbortHandlersMap;
    [KEY_registerAbortHandler]: RegisterAbortHandler;
    [KEY_abortPromise]: AbortPromise;
    [KEY_storeEpochHolder]: StoreEpochHolder;
};
export type { AtomState as INTERNAL_AtomState, Mounted as INTERNAL_Mounted, AtomStateMap as INTERNAL_AtomStateMap, MountedMap as INTERNAL_MountedMap, InvalidatedAtoms as INTERNAL_InvalidatedAtoms, ChangedAtoms as INTERNAL_ChangedAtoms, Callbacks as INTERNAL_Callbacks, AtomRead as INTERNAL_AtomRead, AtomWrite as INTERNAL_AtomWrite, AtomOnInit as INTERNAL_AtomOnInit, AtomOnMount as INTERNAL_AtomOnMount, EnsureAtomState as INTERNAL_EnsureAtomState, FlushCallbacks as INTERNAL_FlushCallbacks, RecomputeInvalidatedAtoms as INTERNAL_RecomputeInvalidatedAtoms, ReadAtomState as INTERNAL_ReadAtomState, InvalidateDependents as INTERNAL_InvalidateDependents, WriteAtomState as INTERNAL_WriteAtomState, MountDependencies as INTERNAL_MountDependencies, MountAtom as INTERNAL_MountAtom, UnmountAtom as INTERNAL_UnmountAtom, Store as INTERNAL_Store, BuildingBlocks as INTERNAL_BuildingBlocks, StoreHooks as INTERNAL_StoreHooks, };
declare function hasInitialValue<T extends AnyAtom>(atom: T): atom is T & (T extends Atom<infer Value> ? {
    init: Value;
} : never);
type ActuallyWritableAtom<T extends AnyAtom> = T extends WritableAtom<infer V, infer A, infer R> ? T & WritableAtom<V, A, R> : T extends Atom<infer V> ? T & WritableAtom<V, unknown[], unknown> : never;
declare function isActuallyWritableAtom<T extends AnyAtom>(atom: T): atom is ActuallyWritableAtom<T>;
declare function isAtomStateInitialized(atomState: AtomState<AnyValue>): boolean;
declare function returnAtomValue<Value>(atomState: AtomState<Value>): Value;
declare function isPromiseLike(p: unknown): p is PromiseLike<unknown>;
declare function shouldThrowSynchronously(error: unknown): boolean;
declare function addPendingPromiseToDependency(atom: AnyAtom, promise: PromiseLike<AnyValue>, dependencyAtomState: AtomState): void;
declare function getMountedOrPendingDependents(atom: AnyAtom, atomState: AtomState, mountedMap: MountedMap): Iterable<AnyAtom>;
type StoreHook = {
    (): void;
    add(callback: () => void): () => void;
};
type StoreHookForAtoms = {
    (atom: AnyAtom): void;
    add(atom: AnyAtom, callback: () => void): () => void;
    add(atom: undefined, callback: (atom: AnyAtom) => void): () => void;
};
/** StoreHooks are an experimental API. */
type StoreHooks = {
    /** Listener to notify when the atom state is created. */
    readonly i?: StoreHookForAtoms;
    /** Listener to notify when the atom is read. */
    readonly r?: StoreHookForAtoms;
    /** Listener to notify when the atom value is changed. */
    readonly c?: StoreHookForAtoms;
    /** Listener to notify when the atom is mounted. */
    readonly m?: StoreHookForAtoms;
    /** Listener to notify when the atom is unmounted. */
    readonly u?: StoreHookForAtoms;
    /** Listener to notify when callbacks are being flushed. */
    readonly f?: StoreHook;
};
declare function initializeStoreHooks(storeHooks: StoreHooks): Required<StoreHooks>;
declare function getBuildingBlocks(store: Store): Readonly<BuildingBlocks>;
declare function buildStore(partialBuildingBlocks?: Partial<BuildingBlocks>): Store;
export { buildStore as INTERNAL_buildStoreRev4, getBuildingBlocks as INTERNAL_getBuildingBlocksRev4, initializeStoreHooks as INTERNAL_initializeStoreHooksRev4, KEY_atomStateMap as INTERNAL_KEY_atomStateMap, KEY_mountedMap as INTERNAL_KEY_mountedMap, KEY_invalidatedAtoms as INTERNAL_KEY_invalidatedAtoms, KEY_changedAtoms as INTERNAL_KEY_changedAtoms, KEY_mountCallbacks as INTERNAL_KEY_mountCallbacks, KEY_unmountCallbacks as INTERNAL_KEY_unmountCallbacks, KEY_storeHooks as INTERNAL_KEY_storeHooks, KEY_atomRead as INTERNAL_KEY_atomRead, KEY_atomWrite as INTERNAL_KEY_atomWrite, KEY_atomOnInit as INTERNAL_KEY_atomOnInit, KEY_atomOnMount as INTERNAL_KEY_atomOnMount, KEY_ensureAtomState as INTERNAL_KEY_ensureAtomState, KEY_flushCallbacks as INTERNAL_KEY_flushCallbacks, KEY_recomputeInvalidatedAtoms as INTERNAL_KEY_recomputeInvalidatedAtoms, KEY_readAtomState as INTERNAL_KEY_readAtomState, KEY_invalidateDependents as INTERNAL_KEY_invalidateDependents, KEY_writeAtomState as INTERNAL_KEY_writeAtomState, KEY_mountDependencies as INTERNAL_KEY_mountDependencies, KEY_mountAtom as INTERNAL_KEY_mountAtom, KEY_unmountAtom as INTERNAL_KEY_unmountAtom, KEY_setAtomStateValueOrPromise as INTERNAL_KEY_setAtomStateValueOrPromise, KEY_storeGet as INTERNAL_KEY_storeGet, KEY_storeSet as INTERNAL_KEY_storeSet, KEY_storeSub as INTERNAL_KEY_storeSub, KEY_enhanceBuildingBlocks as INTERNAL_KEY_enhanceBuildingBlocks, KEY_abortHandlersMap as INTERNAL_KEY_abortHandlersMap, KEY_registerAbortHandler as INTERNAL_KEY_registerAbortHandler, KEY_abortPromise as INTERNAL_KEY_abortPromise, KEY_storeEpochHolder as INTERNAL_KEY_storeEpochHolder, hasInitialValue as INTERNAL_hasInitialValue, isActuallyWritableAtom as INTERNAL_isActuallyWritableAtom, isAtomStateInitialized as INTERNAL_isAtomStateInitialized, returnAtomValue as INTERNAL_returnAtomValue, isPromiseLike as INTERNAL_isPromiseLike, shouldThrowSynchronously as INTERNAL_shouldThrowSynchronously, addPendingPromiseToDependency as INTERNAL_addPendingPromiseToDependency, getMountedOrPendingDependents as INTERNAL_getMountedOrPendingDependents, };