react-intersection-observer-ng/dist/test-utils.d.ts

Monitor if a component is inside the viewport, using IntersectionObserver API

/**
 * Set the `isIntersecting` on all current IntersectionObserver instances
 * @param isIntersecting {boolean}
 */
export declare function mockAllIsIntersecting(isIntersecting: boolean): void;
/**
 * Set the `isIntersecting` for the IntersectionObserver of a specific element.
 * @param element {Element}
 * @param isIntersecting {boolean}
 */
export declare function mockIsIntersecting(element: Element, isIntersecting: boolean): void;
/**
 * Call the `intersectionMockInstance` method with an element, to get the (mocked)
 * `IntersectionObserver` instance. You can use this to spy on the `observe` and
 * `unobserve` methods.
 * @param element {Element}
 * @return IntersectionObserver
 */
export declare function intersectionMockInstance(element: Element): IntersectionObserver;