import { Context } from 'egg';
export interface Handler<T> {
    fn: () => Promise<T> | T;
    fallbackFn?: () => Promise<T> | T;
    logError?: boolean;
}
export declare type HandlerTuple<T extends [unknown, ...unknown[]]> = {
    [P in keyof T]: Handler<T[P]>;
};
export declare type ResultTuple<T extends [unknown, ...unknown[]]> = {
    [P in keyof T]: T[P];
};
export declare function withDefaultValue<T>(value: T): () => T;
export declare function aggregator<T extends [unknown, ...unknown[]]>(ctx: Context, iterable: HandlerTuple<T>): Promise<ResultTuple<T>>;