export interface MutationState<T = unknown> {
    isPending: boolean;
    error: Error | null;
    data: T | null;
}
export declare function useMutation<TArgs extends any[], TResult>(fn: (...args: TArgs) => Promise<TResult>, opts?: {
    onSuccess?: (data: TResult) => void | Promise<void>;
}): {
    mutate: (...args: TArgs) => Promise<TResult>;
    isPending: boolean;
    error: Error | null;
};
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