export interface StateTree {
    [key: string]: StateTree | any;
}
export type Read<xTree> = {
    readonly [P in keyof xTree]: xTree[P] extends StateTree ? Read<xTree[P]> : xTree[P];
};
export type Observer<xTree, X> = (readable: xTree) => X;
export type Reaction<X> = (x: X) => void;
export interface TrackingSession {
    paths: string[][];
    flip: boolean;
    observer: Observer<any, any>;
    reaction?: Reaction<any>;
}
export type Subscription<xTree extends StateTree> = (readable: xTree) => void;
export interface RestrictedSnapstate<xTree extends StateTree> {
    state: xTree;
    readable: xTree;
    readonly: Read<xTree>;
    subscribe(subscription: Subscription<xTree>): () => void;
    track<X>(observer: Observer<xTree, X>, reaction?: Reaction<X>, options?: {
        flip?: boolean;
    }): () => void;
    unsubscribeAll(): void;
    untrackAll(): void;
    wait(): Promise<void>;
}
export interface Snapstate<xTree extends StateTree> extends RestrictedSnapstate<xTree> {
    writable: xTree;
}
export type GetTree<xSnap extends RestrictedSnapstate<StateTree>> = xSnap extends RestrictedSnapstate<infer xTree> ? xTree : never;