/**
 * Any function helper type.
 *
 * @internal
 */
export declare type AnyFn = (...args: any[]) => unknown;
/**
 * `transformInput` hook function.
 *
 * @public
 */
export declare type TransformInput<F extends AnyFn> = F extends (...args: infer A) => unknown ? (...args: A) => A : never;
/**
 * `enter` hook function.
 *
 * @public
 */
export declare type TapInput<F extends AnyFn> = F extends (...args: infer A) => unknown ? (...args: A) => void : never;
/**
 * `transformOutput` hook function.
 *
 * @public
 */
export declare type TransformOutput<F extends AnyFn> = F extends (...args: any[]) => infer R ? (...args: [R]) => R : never;
/**
 * `leave` hook function.
 *
 * @public
 */
export declare type TapOutput<F extends AnyFn> = F extends (...args: any[]) => infer R ? (...args: [R]) => void : never;
/**
 * Hook.
 *
 * @param unsubscribe - An unsubscribe function that can be used by the hook.
 *
 * @public
 */
export declare type Hook<H extends AnyFn> = (unsubscribe: () => void) => H;
/**
 * Hook subscriber.
 *
 * @param subscription - The subscription to a hook.
 *
 * @public
 */
export declare type HookSubscriber<H extends AnyFn> = (subscription: Hook<H>) => void;
/**
 * The hooks available.
 *
 * @public
 */
export interface Hooks<F extends AnyFn> {
    /**
     * Called before each invocation, can be used to change input parameters.
     */
    transformInput: HookSubscriber<TransformInput<F>>;
    /**
     * Called before each invocation, after parameter tranfsormation.
     */
    enter: HookSubscriber<TapInput<F>>;
    /**
     * Called after each invocation, can be used to change the result.
     */
    transformOutput: HookSubscriber<TransformOutput<F>>;
    /**
     * Called after each invocation, after result tranfsormation.
     */
    leave: HookSubscriber<TapOutput<F>>;
}
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