export type DeepPartial<T> = T extends object ? {
    [P in keyof T]?: DeepPartial<T[P]>;
} : T;
export type WithRequired<T, K extends keyof T> = Omit<T, K> & Required<Pick<T, K>>;
export type WithPatrial<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>;
export type Override<A, B> = {
    [K in keyof A]: K extends keyof B ? B[K] : A[K];
};
export type GetVariablesOption<TVars> = TVars extends void ? {
    variables?: TVars;
} : {
    variables: TVars;
};
export type DataUpdateFunction<TInput, TOutput> = (input: TInput) => TOutput;
export type Updater<TInput, TOutput> = TOutput | DataUpdateFunction<TInput, TOutput>;
export interface QueryMeta {
    [index: string]: unknown;
}
export type FetchDirection = 'forward' | 'backward';
export type QueryFunctionContext<TPageParam = never> = [TPageParam] extends [
    never
] ? {
    signal: AbortSignal;
    meta: QueryMeta | undefined;
} : {
    signal: AbortSignal;
    pageParam: TPageParam;
    direction: FetchDirection;
    meta: QueryMeta | undefined;
};
export type QueryFunction<TFetcherData = unknown, TVars = unknown, TPageParam = never> = (variables: TVars, context: QueryFunctionContext<TPageParam>) => TFetcherData | Promise<TFetcherData>;
export interface FetchMeta {
    fetchMore?: {
        direction: FetchDirection;
    };
}
export type NotifyEventType = 'added' | 'removed' | 'updated';
export interface NotifyEvent {
    type: NotifyEventType;
}