/// <reference types="react" />
import * as React from 'react';
import { ValueComparison } from '../../Utils/Compare';
import { IterableLike, Property } from '../../WebRx';
export declare function renderIterable<T>(source: IterableLike<T> | undefined, selector?: (item: T, index: number, items: T[]) => React.ReactNode, projector?: (items: React.ReactNode[]) => React.ReactNode, sortKey?: (item: T) => any, sortComparer?: ValueComparison<T>, defaultSelector?: () => T | undefined): React.ReactNode;
export declare function renderConditional(condition: Property<boolean> | boolean | undefined | null, trueContent: () => React.ReactNode, falseContent?: () => React.ReactNode): {} | null | undefined;
export declare function renderNullable<T>(item: T | undefined | null, notNullContent: (x: T) => React.ReactNode, nullContent?: () => React.ReactNode, constraint?: (x: T) => boolean): {} | null | undefined;
export declare function focusElement<T extends HTMLElement = HTMLElement>(instance: React.ReactInstance | null | undefined, action?: (elem: T) => void): void;
export declare function classNames(...args: any[]): string;