export declare type Handler<T, R = unknown> = (input: T) => R;
export declare type SpreadHandler<T extends unknown[], R = void> = (...input: T) => R;
export declare type VoidHandler<R = unknown> = () => R;
export declare type AsyncHandler<T, R = unknown> = (input: T) => Promise<R>;
export declare type SpreadAsyncHandler<T extends unknown[], R = unknown> = (...input: T) => Promise<R>;
export declare type VoidAsyncHandler<R = unknown> = () => Promise<R>;
export declare type Producer<T> = () => T;