interface String {
    capitalize(): string;
    uncapitalize(): string;
    column2field(): string;
    field2column(): string;
    random(len: number): string;
}
interface Func<T> {
    (t: T, index: number, array: T[]): T[];
}
interface Key<T> {
    (val: T, index: number, array: T[]): string;
}
interface Value<T> {
    (val: T, index: number, array: T[]): any;
}
interface Compare<T> {
    (v1: T, v2: T): boolean;
}
interface Array<T> {
    shuffle(): this;
    random(size: number): Array<T>;
    randomExtract(): T;
    map2obj(key: keyof T | Key<T>, value?: string | Value<T>): Object;
    mapping(key: keyof T | Function, value?: Function): Map<any, T>;
    group(key: keyof T | Function, value?: Function): Map<any, Array<T>>;
    sum(prop?: keyof T | Function): number;
    max(prop?: keyof T | Function): number;
    min(prop?: keyof T | Function): number;
    average(prop?: keyof T | Function): number;
    getIndex(item: T, compare?: string | Compare<T>): Number;
    distinct(prop?: keyof T | Function): Array<T>;
    duplication(prop?: keyof T | Function): Array<T>;
    intersection(array: any[], prop?: keyof T | Function): Array<T>;
    union(array: any[], prop?: keyof T | Function): Array<T>;
    difference(array: any[], prop?: keyof T | Function): Array<T>;
    remove(...items: T[]): T[];
}
interface Math {
    add(a: number, b: number): number;
    sub(a: number, b: number): number;
    multiply(a: number, b: number): number;
    divide(a: number, b: number): number;
}
interface Number {
    toChines(): string;
}
interface Date {
    format(fmt: string): string;
}
interface JSON2 {
    parse(json: string): any;
    stringify(obj: any): string;
}
declare const convert: (prop?: string | Function) => (e: any) => any;
declare const getDecimalsPlace: (num: string) => number;