/**
 * Test whether the "boolean" attribute of an element
 * is `true` or `false`
 *
 * This is so we can either assign boolean attributes
 * as either:
 * <my-element [booleanAttribute]="true"></my-element>
 * or
 * <my-element booleanAttribute></my-element>
 *
 */
export declare function attributeIsPresent(value: boolean): boolean;