export declare const noDate: Date;
export declare function replacer(key: string, value: any): any;
declare global {
    interface Array<T> {
        stringify(): string;
        amap<U>(func: (T: any) => Promise<U>): Promise<U[]>;
    }
}
export declare function isDefined<T>(argument: T | undefined | null): argument is T;
export declare function download(url: string, directory: string, filename: string): Promise<string>;
export declare function run(command: string, timeout?: number): Promise<{
    stdout: string;
    stderr: string;
}>;
export declare function round(n: number, decimals?: number): number;
export declare const sum: (values: number[]) => number;
export declare function max(array: number[]): number | undefined;
export declare function min(array: number[]): number | undefined;
export declare function flatten<T>(list: T[][]): T[];
export declare const dot: (v1: number[], v2: number[]) => number;
export declare function average(values: number[]): (number | undefined);
export declare function delay(ms: number): Promise<unknown>;
export declare function asyncFilter<T>(arr: Array<T>, predicate: (T: any) => Promise<boolean>): Promise<Array<T>>;
export declare function random(min: number, max: number): number;
export declare function hash(str: string): number;