import { ElementRef } from '@angular/core';
export declare function getElementAttr(el: ElementRef, attr?: string): any;
export declare function hasElementAttr(el: ElementRef, attr: string): boolean;
/**
 * Force a data-bound value (typically a string) to a boolean
 *
 * @param value value set via element property/attribute
 */
export declare function forceBooleanType(value: any): boolean;