import { Renderer2 } from '@angular/core';
/**
 * Update host component style `class`
 *
 * 更新宿主组件样式 `class`
 *
 * ```ts
 * updateHostClass(
 *  this.el.nativeElement,
 *  this.renderer,
 *  {
 *    [ 'classname' ]: true,
 *    [ 'classname' ]: this.type === '1',
 *    [ this.cls ]: true,
 *    [ `a-${this.cls}` ]: true
 *  })
 * ```
 */
export declare function updateHostClass(el: HTMLElement, renderer: Renderer2, classMap: Record<string, unknown>, preClean?: boolean): void;