import { type Signal } from "@angular/core";
import { type FetchStatus, type MutationObserverOptions, type MutationStatus, type QueryClient, type QueryObserverOptions, type QueryObserverResult, type QueryStatus, type RefetchOptions } from "@tanstack/query-core";
/** Signal-based query result returned by {@link useQuery}. */
export interface AngularQueryResult<TData = unknown, TError = Error> {
    readonly data: Signal<TData | undefined>;
    readonly error: Signal<TError | null>;
    readonly isPending: Signal<boolean>;
    readonly isFetching: Signal<boolean>;
    readonly isLoading: Signal<boolean>;
    readonly isSuccess: Signal<boolean>;
    readonly isError: Signal<boolean>;
    readonly isStale: Signal<boolean>;
    readonly status: Signal<QueryStatus>;
    readonly fetchStatus: Signal<FetchStatus>;
    readonly refetch: (options?: RefetchOptions) => Promise<QueryObserverResult<TData, TError>>;
}
/** Signal-based mutation result returned by {@link useMutation}. */
export interface AngularMutationResult<TData = unknown, TError = Error, TVariables = void> {
    readonly data: Signal<TData | undefined>;
    readonly error: Signal<TError | null>;
    readonly variables: Signal<TVariables | undefined>;
    readonly isPending: Signal<boolean>;
    readonly isSuccess: Signal<boolean>;
    readonly isError: Signal<boolean>;
    readonly isIdle: Signal<boolean>;
    readonly status: Signal<MutationStatus>;
    readonly mutate: (variables: TVariables) => Promise<TData>;
    readonly reset: () => void;
}
/**
 * Angular signal factory for a cached query, backed by TanStack Query Core.
 *
 * Returns one signal per field — `query.data()`, `query.isPending()`,
 * `query.isError()`, `query.status()`, etc.
 *
 * Must be called within an injection context (so it auto-cleans via `DestroyRef`).
 *
 * @param options - TanStack query options (`queryKey`, `queryFn`, `staleTime`, …).
 * @param client - Optional {@link QueryClient} (defaults to the shared singleton).
 * @returns An {@link AngularQueryResult} of signals.
 *
 * @example
 * ```ts
 * import { Component } from "@angular/core";
 * import { useQuery, useSafeQueryFn } from "katanakit-js/adapters/angular";
 * import { useGetApi } from "katanakit-js";
 *
 * @Component({
 *   selector: "app-pokemon",
 *   template: `@if (query.isPending()) { Loading… } @else { {{ query.data()?.name }} }`,
 * })
 * export class PokemonComponent {
 *   readonly query = useQuery({
 *     queryKey: ["pokemon", 25],
 *     queryFn: useSafeQueryFn(() => useGetApi("pokeapi", "pokemonById", { params: { id: 25 } })),
 *   });
 * }
 * ```
 */
export declare function useQuery<TQueryFnData = unknown, TError = Error, TData = TQueryFnData>(options: QueryObserverOptions<TQueryFnData, TError, TData>, client?: QueryClient): AngularQueryResult<TData, TError>;
/**
 * Angular signal factory for a mutation, backed by TanStack Query Core.
 *
 * Must be called within an injection context (so it auto-cleans via `DestroyRef`).
 *
 * @param options - TanStack mutation options (`mutationFn`, `onSuccess`, …).
 * @param client - Optional {@link QueryClient} (defaults to the shared singleton).
 * @returns An {@link AngularMutationResult} of signals.
 *
 * @example
 * ```ts
 * import { Component } from "@angular/core";
 * import { useMutation, useQueryClient } from "katanakit-js/adapters/angular";
 * import { usePost } from "katanakit-js";
 *
 * @Component({
 *   selector: "app-create",
 *   template: `<button [disabled]="mutation.isPending()" (click)="mutation.mutate('Ada')">Create</button>`,
 * })
 * export class CreateUserComponent {
 *   private readonly qc = useQueryClient();
 *   readonly mutation = useMutation({
 *     mutationFn: (name: string) => usePost("api", "createUser", { name }),
 *     onSuccess: () => this.qc.invalidateQueries({ queryKey: ["users"] }),
 *   });
 * }
 * ```
 */
export declare function useMutation<TData = unknown, TError = Error, TVariables = void>(options: MutationObserverOptions<TData, TError, TVariables>, client?: QueryClient): AngularMutationResult<TData, TError, TVariables>;
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