import { ApiResponse, AsyncValue, ValyncOptions, Observer, CacheKey, RequestMethod } from "../core";
/**
 * createValyn creates a custom `useValync` hook bound to a provided HTTP client function.
 * Useful for plugging in your own fetch logic or a library like axios.
 *
 * ⚠️ NOTE:
 * Your `client()` function MUST return a Promise resolving to:
 *
 *    ApiResponse<any>
 *
 *    {
 *      status: "success" | "failed",
 *      data?: T,
 *      error?: { name: string; message: string; code?: number }
 *    }
 *
 * use `onData` to apply transformation from `any => T` for individual endpoint when neccessary.
 * Returning a plain array or object without the `status` field will cause issues.
 */
export declare function createValyn({ client, options: _options, }: {
    client: (url: string, init: RequestInit) => Promise<ApiResponse<any>>;
    options?: Pick<ValyncOptions<any>, "cache" | "retryCount" | "fetchOnMount"> & {
        headers?: HeadersInit;
    };
}): <T>(key: CacheKey, options?: ValyncOptions<T>) => [AsyncValue<T>, (methodOrOpts?: RequestMethod | {
    method?: RequestMethod;
    body?: BodyInit;
}, body?: BodyInit) => void, (updater: (prev: T | null) => T) => void, Observer<T>];
/**
 * useValync is a client-side data fetching hook that provides async state management
 * with caching, optimistic updates, and reactive watching support.
 *
 * ⚠️ NOTE:
 * Your server MUST return a JSON response of the shape:
 *
 *    ApiResponse<T> | ApiResponse<any>
 *
 *    {
 *      status: "success" | "failed",
 *      data?: T,
 *      error?: { name: string; message: string; code?: number }
 *    }
 *
 * Use `onData` if `res.data` does not match your expected frontend type or if you wish to apply transformation,
 * so returning a plain array or object without the `status` field will cause issues.
 */
export declare function useValync<T>(key: CacheKey, options?: ValyncOptions<T>): [
    AsyncValue<T>,
    (methodOrOpts?: RequestMethod | {
        method?: RequestMethod;
        body?: BodyInit;
    }, body?: BodyInit) => void,
    (updater: (prev: T | null) => T) => void,
    Observer<T>
];
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