export declare type V = string | number | boolean;
export declare type KVO = {
    [k: string]: V | V[];
};
export declare type NKVO = {
    [k: string]: number | number[];
};
export declare type Order = 'asc' | 'desc';
export declare type JSONType = 'string' | 'number' | 'integer' | 'boolean' | 'object' | 'array' | 'null';
export declare class ValidationError extends Error {
    field: string;
    constructor(message: string, field: string);
}
export declare const isObject: (v: unknown) => v is object;
export declare const isPrimitive: (v: unknown) => boolean;
export declare const isString: (v: unknown) => v is string;
export declare const isNumber: (v: unknown) => v is number;
export declare const isN: (v: unknown) => v is number;
export declare const isInteger: (number: unknown) => boolean;
export declare const isArray: (arg: any) => arg is any[], isA: (arg: any) => arg is any[];
export declare const isBoolean: (v: unknown) => v is boolean;
export declare const isNull: (v: unknown) => v is null;
export declare const isUndefined: (v: unknown) => v is undefined;
export declare const isNullOrUndefined: (v: unknown) => boolean;
export declare const isFunction: (v: unknown) => boolean;
export declare const isBrowser: () => boolean;
export declare const pf: typeof parseFloat;
export declare const pi: typeof parseInt;
export declare const assign: {
    <T, U>(target: T, source: U): T & U;
    <T_1, U_1, V_1>(target: T_1, source1: U_1, source2: V_1): T_1 & U_1 & V_1;
    <T_2, U_2, V_2, W>(target: T_2, source1: U_2, source2: V_2, source3: W): T_2 & U_2 & V_2 & W;
    (target: object, ...sources: any[]): any;
}, keys: {
    (o: object): string[];
    (o: {}): string[];
}, values: {
    <T>(o: {
        [s: string]: T;
    } | ArrayLike<T>): T[];
    (o: {}): any[];
}, entries: {
    <T>(o: {
        [s: string]: T;
    } | ArrayLike<T>): [string, T][];
    (o: {}): [string, any][];
};
export declare const arr: (v: V | V[]) => V[];
/** @see https://github.com/lodash/lodash/blob/master/isEmpty.js */
export declare const isEmpty: (v?: V[] | KVO | undefined) => boolean;