type Updater<T> = (current: T) => T;
type StateArg<T> = T | Updater<T>;
interface Setter {
    <T>(state: State<T>, val: StateArg<T>): void;
    <T, Args extends unknown[]>(command: Command<T, Args>, ...args: Args): T;
}
type Getter = <T>(readable: Signal<T>) => T;
interface GetterOptions {
    signal: AbortSignal;
}
type Read<T> = (get: Getter, options: GetterOptions) => T;
type Write<T, Args extends unknown[]> = (visitor: {
    get: Getter;
    set: Setter;
}, ...args: Args) => T;
type Watch = Read<void>;
interface State<T> {
    id: number;
    init: T;
    debugLabel?: string;
    toString: () => string;
}
interface Computed<T> {
    id: number;
    read: Read<T>;
    debugLabel?: string;
    toString: () => string;
}
interface Command<T, Args extends unknown[]> {
    id: number;
    write: Write<T, Args>;
    debugLabel?: string;
    toString: () => string;
}
type Signal<T> = State<T> | Computed<T>;

interface Options {
    debugLabel?: string;
}
declare function state<T>(init: T, options?: Options): State<T>;
declare function computed<T>(read: Read<T>, options?: Options): Computed<T>;
declare function command<T, Args extends unknown[]>(write: Write<T, Args>, options?: Options): Command<T, Args>;

interface Store {
    get: Getter;
    set: Setter;
    watch: Watcher;
}
interface WatchOptions {
    signal?: AbortSignal;
    debugLabel?: string;
}
type Watcher = (watch: Watch, options?: WatchOptions) => void;
type StoreEventType = 'set' | 'get' | 'mount' | 'unmount' | 'computed';
type SetArgs<T, CommandArgs extends unknown[]> = [StateArg<T>] | CommandArgs;

declare function createStore(): Store;

type NestedAtom = (State<unknown> | Computed<unknown> | Command<unknown, unknown[]> | NestedAtom)[];
interface DAGNode<T> {
    signal: Signal<T>;
    val: T;
    epoch: number;
}
type Edge = [DAGNode<unknown>, DAGNode<unknown>, number];
interface DebugStore extends Store {
    getReadDependencies: (atom: Computed<unknown>) => NestedAtom;
    getDependenciesGraph: (atom: Computed<unknown>) => Edge[];
    getReadDependents: (atom: State<unknown> | Computed<unknown>) => NestedAtom;
    isMounted: (atom: State<unknown> | Computed<unknown>) => boolean;
}

interface AtomWatch {
    target: State<unknown> | Computed<unknown> | Command<unknown, unknown[]> | string | RegExp;
    actions?: Set<StoreEventType>;
}
declare function createDebugStore(watches?: (AtomWatch | string | RegExp | State<unknown> | Computed<unknown> | Command<unknown, unknown[]>)[], defaultActions?: StoreEventType[]): DebugStore;

export { type Command, type Computed, type DebugStore, type Getter, type Read, type SetArgs, type Setter, type State, type StateArg, type Store, type Updater, type Watch as Watcher, type Write, command, computed, createDebugStore, createStore, state };
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